Category: CBSE Class 8

Online Education for NCERT Class 8 Social Science Extra Questions and Answers

NCERT Class 8 History Extra Questions

1. How, When and Where Class 8 Extra Questions
2. From Trade to Territory Class 8 Extra Questions
3. Ruling the Countryside Class 8 Extra Questions
4. Tribals, Dikus and the Vision of a Golden Age Class 8 Extra Questions
5. When People Rebel Class 8 Extra Questions
6. Colonialism and the City Class 8 Extra Questions
7. Weavers, Iron Smelters and Factory Owners Class 8 Extra Questions
8. Civilising the Native, Educating the Nation Class 8 Extra Questions
9. Women, Caste and Reform Class 8 Extra Questions
10. The Changing World of Visual Arts Class 8 Extra Questions
11. The Making of the National Movement 1870s – 1947 Class 8 Extra Questions
12. India After Independence Class 8 Extra Questions

NCERT Class 8 Geography Extra Questions

1. Resources Class 8 Extra Questions
2. Land, Soil, Water, Natural Vegetation and Wildlife Resources Class 8 Extra Questions
3. Mineral and Power Resources Class 8 Extra Questions
4. Agriculture Class 8 Extra Questions
5. Industries Class 8 Extra Questions
6. Human Resource Class 8 Extra Questions

NCERT Class 8 Civics Extra Questions

1. The Indian Constitution Class 8 Extra Questions
2. Understanding Secularism Class 8 Extra Questions
3. Why Do We Need a Parliament Class 8 Extra Questions
4. Understanding Laws Class 8 Extra Questions
5. Judiciary Class 8 Extra Questions
6. Understanding Our Criminal Justice System Class 8 Extra Questions
7. Understanding Marginalisation Class 8 Extra Questions
8. Confronting Marginalisation Class 8 Extra Questions
9. Public Facilities Class 8 Extra Questions
10. Law and Social Justice Class 8 Extra Questions

Here we are providing Online Education for The Comet 2 Extra Questions and Answers Class 8 English It So Happened, Extra Questions for Class 8 English was designed by subject expert teachers. https://ncertmcq.com/extra-questions-for-class-8-english/

You can refer to NCERT Solutions for Class 8 English It So Happened (Supplementary) Chapter 10 The Comet II Question Answer to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Online Education for The Comet 2 Extra Questions and Answers Class 8 English It So Happened

The Comet 2 Extra Questions and Answers Short Answer Type

The Comet 2 Extra Questions Question 1.
What thought came into minds of Dr. James at night?
Answer:
Dr. James looked up from windows of his room at the star – studded night sky. He felt that amongst *’ those bright stars, a destructive comet was approaching to collide with the earth. He was apprehensive if he had done his calculations correctly.

Comet 2 Extra Questions Question 2.
Whom did Sir John invite for the conference?
Answer:
Sir John invited astronomers, computer scientists, nuclear physicists, space technologies, biologists and Manoj Dutta was the special invite.

Extra Questions Of Comet 2 Question 3.
What was the ‘slight respite’ as per the calculations of the scientists?
Answer:
The scientists at the conference agreed that the comet would hit at the earth. There were small chances’ that it would pass through the earth, but it was certain that it wouldn’t damage in totality. Subsequently, the respite wasn’t enough not take action against it.

Comet 2 Class 8 Extra Questions And Answers Question 4.
What were the possible proposition at the meeting?
Answer:
The experts dismissed defensive measures like living in underground bunkers and decided to take an offensive action. They consented to deflect the path of the comet.

The Comet Extra Questions Answers Question 5.
What was ‘Project Light Brigade’?
Answer:
‘Project Light Brigade’ was a secret operation against the comet. It would need the bulk of destructive nuclear power. The timings and position was great taken care of. The nuclear payload was to be leaded on a spaceship and to be detonated for targeting the comet.

The Comet 2 Class 8 Questions And Answers Question 6.
Why did Indrani Debi arranged a Yajna for Manoj Dutta?
Answer:
Mr. Manoj Dutta had discovered a comet. According to religious sentiment, observing a comet or any other celestial object might have a bad impact on the life and family of that person. Indrani Devi arranged a Shanti Yajna as recommended by Guruji to pacify the evil spirit behind the comet.

Comet 2 Class 8 Questions And Answers Question 7.
What are comets?
Answer:
Comet are celestial bodies consisting of a nucleus of ice and dust and when near the Sun, a ‘tail’ of gas and dust particles pointing away from the sun.

Comet 2 Question Answer Question 8.
Write the description of letter which was sent by Sir John to Mr. Duttada?
Answer:
The message, Duttada received in is a text message. The message was about Christmas present to be purchased by Sir James. The message secret coded, which meant that the Project was successful.

Question 9.
Did Duttada like the Yajna ceremony? Why or why not? .
Answer:
Duttada did not like the Yajna’ ceremony. He even avoided it. His grandson performed rituals in his place.

Question 10.
What happened on December 15?
Answer:
December 15 was the fateful date when comet Dutta could collide with the earth. However the efforts of scientists and other dignitaries paid off and it was diverted with nuclear explosion.

Question 11.
Why did Duttada went to Rasagolla shop?
Answer:
Duttada was anxiously waiting for response from Sir James. On November 18, a special messenger reached him with an urgent telex message. Duttada immediately rushed to his favourite rasagolla

The Comet 2 Extra Questions and Answers Long Answer Type

Question 1.
Write the difference between the thinking levels of Duttada & Indrani?
Answer:
Duttada had scientific approach whereas his wife looked at things religiously. Duttada look at rituals as social taboos that hampers the development. The successful deviation of comet’s path, a joint effort by scientists Indrani Devi gave credits to her Shanti Puja. Duttada was in pain that progressive outlook could not be evoked in mindset of the people. He felt that void between rich and the poor, educated and illiterate.

Question 2.
“For a moment James wondered if he had done his sums right”. Why was James doubtful about his sums and calculations?
Answer:
James became doubtful about his sums and calculations when he looked up from his window and saw a star studded night sky. He knew that somewhere amongst those stars was Comet Dutta, which was heading for a collision with the earth. It was hard for him to believe the calamity of the future on such a peaceful night.

Question 3.
Why did the scientists at the conference say about James ‘sums’?
Answer:
The scientists said that James ‘sums’ were correct and that there was no escape from the direct hit predieted by him. There was a small chance that the comet might just graze the atmosphere of the earth and not collide. In that case, the loss of life and property would not be fatal. However, that was hardly
reassuring. Therefore, they decided to take some action.

Question 4.
Immediate action was needed, the scientists decided. Give one example each of‘defensive’ and ‘offensive’ action mentioned in the text.
Answer:
The approaching comet needed immediate action. The scientists had two options. The defensive measure was that the people should live in bunkers. The offensive action was to do something to deflect the comet from its path. This could be done by exploding a nuclear payload near the comet.

Question 5.
“I am not buying any Christmas presents till December 15”. What did Sir John mean by that?
Answer:
Sir John meant that he was not very sure that they would succeed in their operation. If the experiment failed, the comet would hit the earth on December 15.

Question 6.
What is Duttada expected to do on his return from London?
Answer:
After his return from London he discovered that Indrani Debi had arranged for a “Yajna’ to be performed. ‘ She, along with other family members, planned it toward of evils of the comet’s visit.

Question 7.
What is his reaction to the proposal?
Answer:
Duttada reacted very angrily to the proposal and said that it was all superstition. So he refused to participate in the “Yajna’.

Question 8.
(i) What does ‘Project Light Brigade’ refer to?
(ii) What does Sir John say about the project in his letter to Duttada in October?
Answer:
(i) “Project Light Brigade’ refers to the plan to divert the comet from its path. The plan was to launch a spacecraft and explode the nuclear device near the comet.
(ii) ‘The charge of the Light Brigade has begun’.

Question 9.
Did Sir John buy Christmas presents on December 15? How did Duttada get to know about it?
Answer:
Yes, Sir John bought Christmas presents on December 15. Duttada got to know about it in the letter that Sir John had written to him, saying that he was confident of buying Christmas presents on December 15, indicating that the project was successful.

Question 10.
Why, according to Indrani Debi, had ‘the comet’ not been disastrous? Do you agree with her?
Answer:
According to Indrani Debi it was the effect of the Yajna which did not allow the comet to create disaster on the earth. For someday who is as rationale as Duttada, it is impossible to believe. I, too, oppose her idea. Those who believe in comets bringing bad luck, her idea would appeal.

Here we are providing Online Education for The Great Stone Face 2 Extra Questions and Answers Class 8 English Honeydew, Extra Questions for Class 8 English was designed by subject expert teachers. https://ncertmcq.com/extra-questions-for-class-8-english/

You can refer to NCERT Solutions for Class 8 English honeydew Chapter 10 The Great Stone Face II to revise the Questions and Answers in the syllabus effectively and improve your chances of securing high marks in your board exams.

Online Education for The Great Stone Face 2 Extra Questions and Answers Class 8 English Honeydew

The Great Stone Face 2 Extra Questions and Answers Short Answer Type

The Great Stone Face 2 Extra Questions Question 1.
Write the physical appearance of Ernest.
Answer:
Ernest had white hairs on his head, wrinkle across his forehead and furrows in his cheeks. He was an old man, but more numerous than white hairs. He had wise thought in mind.

The Great Stone Face 2 Extra Questions Answers Question 2.
According to Ernest, who was the man which resembles Great Stone Face?
Answer:
According to Ernest, the poet whose poetry he read, seated on the bench before his cottage door arid he asked to mountain “Is not this man worthy to be your likeness?”

Great Stone Face 2 Extra Questions Question 3.
Why did the poet want to meet Ernest?
Answer:
The poet wanted to meet Ernest whose wisdom walked hand in hand with the noble simplicity of his life.

The Great Stone Face 1 Extra Questions Answers Question 4.
Did the poet go to meet Ernest? What did they do?
Answer:
Yes, the poet went to meet Ernest. They both sat together and Ernest tried to find great stone face in poet.

Extra Questions Of The Great Stone Face 2 Question 5.
What did the poet reply when he listened Ernest’s prophecy story?
Answer:
He replied that, “to find in me the likeness of The Great Stone Face, I am not worthy to be its likeness”.

The Great Stone Face Extra Questions Question 6.
Why were Ernest’s and poet’s eyes wet with tears?
Answer:
The Ernest’s and poet’s eyes were in tears because the thought poet put in his book is entirely different from his real life. He had dream, but they have been only. So he burst into tears.

Extra Questions Of The Great Stone Face 1 Question 7.
What did Ernest address to the pe’ople of valley?
Answer:
Ernest threw a look of familiar kindness around his audience. He spoke all his thoughts and people agreed. That was not preacher voice, these were the words of life. He melted out the heart of people of valley.

The Great Stone Face 2 Question Answer Question 8.
Who said that Ernest is himself the Great Stone Face and why?
Answer:
The poet said that Ernest was himself the Great Stone Face because the thought he had wrote matched with the thought of Ernest. He saw the Great Stone Face covered with the white mist like Ernest’s face coloured with the white hair.

Question 9.
Did the prophecy come true at the end of the lesson?
Answer:
Yes, the prophecy came true at the end of the lesson. As all the people agree whatever poet had said and actually Ernest resembles the Great Stone Face.

Question 10.
What did Ernest think about prophecy?
Answer:
Ernest finished his speech and took the poet in his arm and still thinking that some wiser and better man would appear, resembling to the Great Stone Face.

The Great Stone Face 2 Extra Questions and Answers Long Answer Type

Question 1.
‘Do you think a mountain can bring wisdom in a person? Give your opinion.
Answer:
Ernest was in habit of observing the mountain since childhood. Once his mother told him that he could bring change in the lives of villagers. After he worked hard he contemplated by observing the mountain. The mountain reflects his mood whether it is happy or pensive. He gazed but all the thoughts were of his own. The mountain could inspire him yet wisdom was attained by himself. He attained popularity for his sage like quality.

Question 2.
Why did the villagers have firm faith in prophesy?
Answer:
The villagers had firm faith in the prophesy. They welcomed Gather Gold for his similarity. They lost faith in him, because he didn’t bring any change in the lives of the people. Then they cheered for general. Finally, they settled for Ernest. He was given faith by his mother that he could be the shape. It made the villagers optimistic and gave hope for the upliftment. Thus, we can’t accept it in a literary sense. But the hope it bestowed on village was beyond measures. Thus there is no harm in having such prophesy. It reflects the simplicity of the believers.

Question 3.
How was Ernest different from others in the valley?
Answer:
Ernest was well known among the people, as a good and simple hearted man. He was humble, hardworking and thoughtful man. He used to deliver thoughtful words from the depth of his heart. As he grew old, he had become a renowned personality beyond the valley.

Question 4.
Why did Ernest think the poet was like the Stone Face?
Answer:
The poet wrote songs with lofty thoughts. The poetry of the poet found his way to Ernest also. Ernest used to read the poet’s poems and songs after his day’s work and found them worthy. When the poet came to meet Ernest, he looked wise, gently and kind. Even the Great Stone Face appeared bending forward to listen to his talk. For all these reasons, Ernest began to think that the poet was like the Great Stone Face.

Question 5.
What did the poet himself say about his thoughts and poems?
Answer:
The poet confessed that he was not worthy to be compared with the Stone Face. His actions did not match with his thoughts.

Question 6.
What made the poet proclaim Ernest was the Stone Face?
Answer:
The poet heard Ernest while he was talking to his audience. Ernest was speaking from the depth of his heart and mind. He felt that Ernest’s own life and characters were a nobler kind of poetry than he had ever written. The poet found great similarities between the misty white clouds around the Great Stone Face and the white hairs around the brow of Ernest. So, the poet declared that Ernest himself was the Stone Face.

Question 7.
(i) Who, by common consent, turned out to be like the Great Stone Face?
(ii) Did Ernest believe-that the old prophecy had come true? What did he say about it?
Answer:
(i) By common consent, Ernest turned out to he like the Great Stone Face.
(ii) No, Ernest did not believe that the old prophecy had come true. Even though everybody had agreed that he has the likeness of the Great Stone Face, he himself hoped that some wiser and better man than himself would appear, bearing a resemblance to the Great Stone Face.

The Great Stone Face 2 Extra Questions and Answers Reference to Context

Passage 1

The years hurried on, and brought white hairs upon the head of Ernest, and made wrinkles across his forehead and furrows in his cheeks. He was an old man. But not in vain had he grown old; more numerous than the white hairs on his head were the wise thoughts in his mind. And Ernest had ceased to be obscure. Unsought for, undesired, had come the fame which so many seek. He had become famous beyond the limits of the valley.

College professors, and even the active men of cities, came from far to see and converse with Ernest, and he received them with gentle sincerity, and spoke freely with them of whatever came uppermost, or lay deepest in his heart or their own. While they talked together, his face would brighten, unawares, and shine upon them, as with a mild evening light.

While Ernest had been growing old, God had granted a new poet to this earth. He, too, was a native of the valley, but had spent the greater part of his life in distant cities, pouring out his sweet music everywhere. Neither was the Great Stone Face forgotten, for the poet had celebrated it in a poem. The songs of this poet found their way to Ernest. He read them after his customary toil, seated on the bench before his cottage door. As he read he lifted his eyes to the mountain.

Question 1.
Why did the writer say ‘not in vain Grow old’?
Answer:
Ernest had turned into an old man with wise thoughts and thus he became famous.

Question 2.
Who visited him often and why?
Answer:
He was visited by college professors, active men of society to seek his advice.

Question 3.
What is a mild evening light?
Answer:
Ernest was gaining adulation from the visitors who came to seek his advice. Then his face would brighten and shine upon them giving comfortable glare.

Question 4.
Why wasn’t the Great Face forgotton?
Answer:
The Great Stone Face was made immortal by Ernest’s poem.

Question 5.
What was his ‘customary toil’?
Answer:
The customary toil was the work, he usually did to earn his living.

Passage 2

At the hour of sunset, as had long been his custom, Ernest was to speak to a group of neighbours in the open air. Together he and the poet went to the meeting place, arm in arm. From there could be seen the Great Stone Face. Ernest threw a look of familiar kindness around upon his audience. He began to speak to the people what was in his heart and mind.

His words had power, because they agreed with his thoughts; and his thoughts had reality and depth, because they harmonised with the life which he had always lived. It was not mere breath that the preacher uttered; they were the words of life. A life of good deeds and selfless love was melted into them.

The poet, as he listened, felt that the life and character of Ernest were a nobler strain of poetry than he had ever written. His eyes filled with tears and he said to himself that never was there so worthy a sage as that mild, sweet, thoughtful face, with the glory of white hair diffused about it.

Question 1.
When did Ernest interact with neighbours?
Answer:
Ernest interacted with a group of neighbour at the sunset in the open air.

Question 2.
Why did people take interest in listening to Ernest?
Answer:
People loved Ernest as his words had power and his thought had reality and depth.

Question 3.
What did the poet feel about Ernest?
Answer:
The poet listened to him and felt that he was a life of good deeds and selfless love. He also realized that Ernest had a nobler strain of poetry.

Question 4.
How did the poet find Ernest face similar to ‘The Great Stone Face’?
Answer:
The poet was impressed with the sage like quality of Ernest. When Golden light of setting sun full on the mountain, then he realized its similarity with the face of Ernest.

Question 5.
Was the similarity appeasement or appreciation?
Answer:
The poet was impressed with the words of wisdom of Ernest. He had developed a great respect for him.

Here we are providing Online Education Reproduction in Animals Class 8 Extra Questions and Answers Science Chapter 9 was designed by subject expert teachers. https://ncertmcq.com/extra-questions-for-class-8-science/

Online Education for Class 8 Science Chapter 9 Extra Questions and Answers Reproduction in Animals

Reproduction In Animals Class 8 Questions And Answers Question 1.
Indicate whether the following statement is true or false: A zygote is formed as a result of fertilization.
Answer:
True.

Reproduction In Animals Questions And Answers Question 2.
Indicate whether the following statement is true or false: An embryo is made of a single cell.
Answer:
False.

Ncert Science Book Class 8 Extra Questions With Answers Question 3.
Indicate whether the following statement is true or false: Fertilization is necessary even in asexual reproduction.
Answer:
False.

Extra Question Of Class 8 Science Question 4.
What is the name of reproduction in which fusion of male and female gametes takes place?
Answer:
It is called as sexual reproduction.

Reproduction In Animals Question Answers Question 5.
What does tests produce?
Answer:
The testes produce the male gametes called sperms.

Reproduction In Animals Class 10 Questions And Answers Question 6.
What name is given to the babies born through in vitro fertilisation technique?
Answer:
Test-tube baby.

Reproduction In Animals Class 8 Question 7.
Draw the figure of a sperm.
Answer:

Reproduction In Animals Class 8 Question Answers Question 8.
What happens when sperms come in contact with the egg?
Answer:
Fertilisation takes place.

Extra Questions For Class 8 Science With Answers Question 9.
What is the other name of a fertilised egg?
Answer:
Zygote.

Class 8 Science Extra Questions Question 10.
What is meant by in vitro fertilisation?
Answer:
It means that fertilisation is done outside the body through artificial means.

Extra Questions Class 8 Science Question 11.
What is the fertilisation called which takes place inside the female body?
Answer:
It is called internal fertilisation.

Extra Questions Of Science Class 8 Question 12.
Which organisms undergo internal fertilisation?
Answer:
Humans, cows, goats, dogs, horses, elephants, buffaloes, etc.

Extra Questions For Class 8 Science Question 13.
Where does the external fertilisation take place?
Answer:
It takes place in water.

Class 8 Science Ncert Extra Questions Question 14.
What happens after fertilisation?
Answer:
The fertilisation results in the formation of zygote, which begins to develop into an embryo.

Extra Questions Of Class 8 Science Question 15.
When does a mother give birth to young one?
Answer:
When the development of the foetus is complete, the mother gives birth to young one.

Question 16.
What name is given to animals which give birth to young ones?
Answer:
They are called viviparous animals.

Question 17.
What name is given to the animals which lay eggs?
Answer:
They are called oviparous animals.

Question 18.
Do the young ones in all animals look alike?
Answer:
No, in some animals, the young ones may look very different whereas in other animals the young ones look alike.

Question 19.
Give the different stages in frog’s life-cycle.
Answer:
It is as follows: Egg → tadpole (larva) → adult.

Question 20.
State the stages of life cycle of silkworm.
Answer:
It is as follows: Egg → larva or caterpillar → pupa (cocoon) → adult (moth).

Question 21.
What name is given to the drastic change that takes place during the development of an animal?
Answer:
Metamorphosis.

Question 22.
State the reproduction in which new individual develops from the buds in Hydra.
Answer:
Budding.

Question 23.
What is the name of the process of reproduction in Amoeba?
Answer:
Binary fission.

Question 24.
What name is given to a process in which production of an identical cell or a complete organism is done?
Answer:
Cloning.

Question 25.
Who performed the cloning process for the first time and where?
Answer:
Ian Wilmut and his colleagues at Roslin Institute in Edinburgh, Scotland.

Question 26.
What is the name of the sheep which was closed for the first time in the world?
Answer:
Dolly.

Question 27.
When was Dolly bom? When and how she died?
Answer:
It was born on 5th July 1996 and it died on 14th February 2003 due to a certain lung disease.

Question 28.
Define internal fertilization with: two examples.
Answer:
Fertilization which takes place inside the female body is called internal fertilization. Examples: Humans, cows, etc.

Question 29.
Define oviparous animals with two examples.
Answer:
The animals which lay eggs are called oviparous animals. We haye seen the eggs of the birds. These animals lay eggs and then the chicks hatch out of the eggs. The examples of oviparous are hen, peacock, crow and parrot, etc.

Question 30.
What is uterus? Is egg a single cell?
Answer:
Uterus is the part where development of the baby takes place. Yes, an egg is a single cell.

Question 31.
What happens when oviducts of women are blocked?
Answer:
In some women oviducts are blocked. These women are unable to bear babies, because’ sperm cannot reach the egg for fertilisation.

Question 32.
Are test-tube babies born in test- tubes?
Answer:
No. Only fertilisation is done in test tubes and then the zygote is placed in the mother’s uterus.

Question 33.
Define foetus.
Answer:
The stage of the embryo in which all the body parts are identifiable is called foetus.

Question 34.
How long does embryo take to develop into chick?
Answer:
The embryo takes three weeks to develop into a chick. During this period hen sits on the eggs to provide sufficient warmth.

Question 35.
Do tadpoles look different from the adult?
Answer:
Yes, tadpoles look very different from the adult frog. In a few days, the tadpoles become frogs after complete metamorphosis.

Question 36.
Do human beings also undergo metamorphosis?
Answer:
In human beings, body parts of the young ones similar to the adults are present from the time of birth. So, human beings do not undergo metamorphosis.

Question 37.
Give examples of organisms undergoing asexual reproduction. Name the type of asexual reproduction in them.
Answer:
The organisms undergoing asexual reproduction are

• Hydra, and
• Amoeba.

The process of reproduction in Hydra is called budding and in Amoeba is known as binary fission.

Question 38.
Write a short note on sperms.
Answer:
Sperms are the male gametes produced by testes. Millions of sperms are produced by the testes. Though the sperms are very small in size, each has a head, a middle piece and a tail. Each sperm is a single cell having all the usual cell components. The tail present in the sperm enables it to swim in the oviduct to reach the egg and perform fertilisation process.

Question 39.
Describe briefly the female reproductive organs.
Answer:
The female reproductive organs are a pair of ovaries, oviducts (fallopian tubes) and the uterus. The ovary produces female gametes called ova (eggs). The egg so produced is a single cell.

In human beings, a single matured egg is released into the oviduct by one of the ovaries every month. Uterus is the part where development of the baby takes place.

Question 40.
How does fertilisation take place and how is zygote formed? Is zygote the beginning of a new individual?
Answer:
When the sperms come in contact with the egg, one of the sperms may fuse with the egg. The fusion of the egg and the sperm is known as fertilisation, which produces zygote.

The process of fertilisation is the meeting of an egg cell from the mother and a sperm cell from the father. So, the new individual inherits some characters from the mother and some from the father and, therefore, zygote is the beginning of a new individual.

Question 41.
Describe in vitro fertilisation and production of test-tube babies.
Answer:
When some women are unable to bear babies because of blocked oviducts. In doctors collect freshly released egg and sperms and keep them together for a few hours for in vitro fertilisation (fertilisation in test-tube).
After the zygote develops for about a week, it is placed in the mother’s uterus. Complete development takes place in the uterus and the baby is born like any other baby.

Question 42.
Raju has a friend who believes that mother is responsible for the sex of a child because she gives birth to the child.
(a) How will Raju correct him using his knowledge of human chromosomes?
(b) What are the values shown by Raju?
Answer:
(a) No, Raju’s friend has wrong perception as mother is not responsible for the gender of the baby.
The sex of baby is depends upon the chromosome. In human beings, 23rd pair are sex chromosomes named X and Y. All unfertilized egg have one X chromosome. But sperms carry different chromosomes X as well as Y.
If a sperm containing X chromosome fertilizes the egg then the resulting fertilized egg contains two X chromosomes that will give birth to a baby girl whereas if a sperm containing Y chromosome fertilizes the egg then the resulting egg contains one X and one Y chromosome that gives birth to a baby boy.

(b) The value shown by Raju is ‘awareness’.

Question 43.
Describe the process of fertilisation in humans?
Answer:
In humans, the process of fertilisation is internal. For this millions of sperms from the male are transferred into the female body. The sperms swim in the oviduct with the help of their tails to reach the egg, when they come in contact with the egg, one of the sperms may fuse with the egg and fertilisation is completed. During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus and zygote is formed. Fertilisation makes the new individual inherits some characteristics from the mother and some from the father.

Question 44.
Draw a labelled diagram of male reproductive organ of human.
Answer:

Question 45.
Draw a labelled diagram of female reproductive organ of human.
Answer:

Question 46.
Name two animals which undergo metamorphosis. Also, name the stages they pass by ? Draw a diagram of different stages of anyone animal.
Answer:
Two animals that undergo metamorphosis are :
(i) Frog.
(ii) Silkworm.

Different stages of frog’s life-cycle :
Egg→ Tadpole (larva) → Frog (adult). Different stages of silkworm’s life-cycle: Egg → Caterpillar → Cocoon (pupa) → Moth (adult).

Multiple Choice Questions (MCQs)

1. External fertilization is common
(a) Terrestrial animal
(b) Aquatic animal
(c) None of these.
Answer:
(b) Aquatic animal.

2. A tadpole develops into an adult frog by the process of
(a) Fertilization
(b) Metamorphosis
(c) Embedding
(d) Budding.
Answer:
(b) Metamorphosis.

Extra Questions for Class 8 Science

Here we are providing Online Education for Reaching the Age of Adolescence Class 8 Extra Questions and Answers Science Chapter 10 was designed by subject expert teachers. https://ncertmcq.com/extra-questions-for-class-8-science/

Online Education for Class 8 Science Chapter 10 Extra Questions and Answers Reaching the Age of Adolescence

Reaching The Age Of Adolescence Class 8 Questions Answers Question 1.
When do human beings and many other kinds of animals become capable of reproduction?
Answer:
They become capable when they get reproductive maturity.

Reaching The Age Of Adolescence Questions And Answers Question 2.
What brings about changes that make a child grow into an adult?
Answer:
Hormones bring about these changes.

Reaching The Age Of Adolescence Question Answer Question 3.
What period covers the “teens”?
Answer:
The years 13 to 18 or 19 covers the ‘teens’.

Reaching The Age Of Adolescence Question And Answer Question 4.
What is the other name of adolescents?
Answer:
It is ‘teenagers’.

Reaching The Age Of Adolescence Class 8 Questions And Answers Question 5.
What is the conspicuous change during the puberty?
Answer:
The most conspicuous change during puberty is the sudden increase in height.

Reaching The Age Of Adolescence Class 8 Pdf Questions And Answers Question 6.
Up to what age girls grow in height faster than the boys?
Answer:
Girls grow in height faster than boys up to 18 years of age.

Question Answer Of Reaching The Age Of Adolescence Question 7.
Do all parts of the body grow at the same rate?
Answer:
No, all parts of the body do not grow at the same rate.

Question And Answer Of Reaching The Age Of Adolescence Question 8.
What factor does height depend on?
Answer:
Height depends upon the genes inherited from parents.

Reaching The Age Of Adolescence Class 8 Solutions Question 9.
What happens to the quality of voice on puberty?
Answer:
Girl’s voice becomes high-pitched and that of boys becomes deep or hoarse.

Reaching The Age Of Adolescence Class 8 Question 10.
Where do endocrine glands release hormones?
Answer:
Endocrine glands release hormones directly into the bloodstream.

Extra Questions For Class 8 Science With Answers Question 11.
Name the secretion of ovaries on reaching puberty.
Answer:
Ovaries begin to produce female hormones called estrogen.

Question Answers Of Reaching The Age Of Adolescence Question 12.
What makes ova in ovaries and sperms in testes mature?
Answer:
FSH or Follicle Stimulating Hormone makes ova mature in ovaries and sperms in testes.

Reaching The Age Of Adolescence Question Answers Question 13.
What marks the beginning of reproductive period when one becomes capable of reproduction ?.
Answer:
It is puberty.

Reaching The Age Of Adolescence Class 8 Notes Question 14.
When does menstrual cycle stop?
Answer:
At 45 to 50 years of age, the menstrual cycle stops.

Extra Questions Class 8 Science Question 15.
What do you understand by menopause?
Answer:
The stoppage of menstrual cycle is termed as menopause.

Class 8 Science Extra Questions Question 16.
How many chromosomes do all humans have?
Answer:
All humans have 23 pairs of chromosomes.

Extra Questions Of Science Class 8 Question 17.
What determines the sex of unborn baby?
Answer:
Sex chromosomes of father determine the sex of unborn baby.

Question 18.
What are sex chromosomes? How many are they?
Answer:
Chromosomes carrying genes for different sexual characters are termed as sex chromosomes. There are two sex chromosomes out of 23 pairs of chromosomes.

Question 19.
What is the hormone produced by pancreas? What is the disease caused due to the non-production of that hormone?
Answer:
Pancreas secretes insulin hormone. Insulin hormone regulates the levels of sugar in the blood. Its deficiency in the blood causes diabetes. In diabetic patients, it is not secreted in required amount, therefore, blood sugar level rises and causes various harmful effects.

Question 20.
How do you calculate the probable full height of a adolescent? Give the formula for this purpose and state an example.
Answer:
The formula for calculation of full height (in cm) is given as follows :
\(\frac{\text { Present height }(\text { in } \mathrm{cm})}{\text { Percentage of full height at this age }} \times 100 \)

Example: A girl is 10 years old and her height is 130 cm. At the end of the growth period, she is likely to be of what height?
Solution:
\(\frac{130 \mathrm{~cm}}{78} \times 100 \mathrm{~cm}\) ≈ 166 cm.

Question 21.
By seeing the data of activity 10.1, can you read the graph and say at what age girls grow in height faster than the boys?
Answer:
Initially girls grow faster than boys but by about 18 years of age, both reach their maximum height. The rate of growth in height is different in different individuals. Some grow suddenly at puberty and then slow down, while others grow gradually.

Question 22.
What is the proportion of growth of the body parts in adolescence?
Answer:
All the parts of the body do not grow at the same rate. Sometimes the arms and legs of adolescents, look oversized and out of proportion with the body. But, soon the other parts catch up and result into a proportionate body.

Question 23.
How does body get adequate nourishment for growth?
Answer:
It is very important to eat the right kind of food, especially during the growing years. This helps the bones, muscles and other parts of the body get adequate nourishment for growth.

Question 24.
What happens to the sex organs of boys and girls at puberty?
Answer:
At puberty, male sex organs like the testes and penis develop completely. The testes also begin to produce sperms. In girls, the ovaries enlarge and eggs begin to mature. Also, ovaries start releasing mature eggs.

Question 25.
What are psychological changes in adolescence?
Answer:
Adolescence is also a period of change in a person’s way of thinking.

• Adolescents are more independent than before and are also self-conscious.
• Intellectual development takes place and they tend to spend considerable time in thinking.
• It is often the time in one’s life when the brain has the greatest capacity for learning.
• Sometimes, however, an adolescent may feel insecure while trying to adjust to the changes in the body and mind.

Question 26.
Describe menstrual cycle.
Answer:
Menstrual cycle is controlled by hormones. The cycle includes the maturation of the egg, its release, thickening of uterine wall and its breakdown if fertilization does not occur. In case the egg is fertilized, it begins to divide and then gets embedded in the uterus for further development.

Question 27.
What do you understand by the term ‘chromosomes’? Diseuss.
Answer:
These are the thread-like structures found in the nucleus of a cell. It contains genes. All human beings have 23 pairs of chromosomes in the nuclei of their cells. Two chromosomes out of these are sex chromosomes.

Question 28.
What should one do to keep the body healthy?
Answer:
To keep the body healthy, one needs to:

• have a balanced diet,
• observe personal hygiene and cleanliness regularly, and
• undertake adequate physical exercises.

During adolescence, however, these become even more essential.

Question 29.
What are the required hygienic activities for boys and girls when they become adolescents?
Answer:
Everyday bath is more necessary for teenagers because the increased activities of sweat glands sometimes make the body smelly. If cleanliness is not maintained, there are chances of catching bacterial infection. Girls should keep track of their menstrual cycle and be prepared for the onset of menstruation. Undergarments should be changed every day. Cotton undergarments should be preferred.

Question 30.
How do HIV viruses enter the human bodies?
Answer:
HIV pass on to a normal person from an infected person by :

• sharing the syringes used for injecting drugs.
• from the infected mother to an infant through milk.
• through sexual contact with a person infected with HIV.

Question 31.
What are myths and taboos regarding bodily changes in case of adolescents?
Answer:
There are many myths and taboos regarding bodily changes that adolescents experience. Some of these are given below :

• A girl becomes pregnant if she looks at boys during menstruation.
• The mother is responsible for the sex of the child.
• A girl should not be allowed to work in the kitchen during menstruation.

These should be discarded outrightly.

Question 32.
What are the drawbacks of early marriage and motherhood?
Answer:
The followings are the drawbacks of early marriage and motherhood :

• Teenage girls are not prepared mentally or physically for motherhood.
• Early marriage and motherhood cause health problems in the mother and the child.
• It also curtails employment opportunities for a young woman and causes mental agony as she is not ready for the responsibilities of motherhood.

Question 33.
Describe the reproductive phase of life in females.
Answer:
Reproductive phase of life in females :

• In females, the reproductive phase of life begins at puberty (10 to 12 years of age) and generally lasts till the age of approximately 45 to 50 years.
• The ova begins to mature with the onset of puberty. One ovum matures and is released by the ovaries once in about 28 to 30 days.
• During this period, the wall of the uterus becomes thick. This is a natural preparation to receive the egg in case it is fertilized and pregnancy occurs.
• If fertilization does not occur, the released egg and the thickened lining of the uterus along with its blood vessels are shed off. This causes bleeding in women which is known as menstruation.

Menstruation occurs once in about 28 to 30 days. Initially, menstrual cycle may be irregular and takes some time to become regular. In case the egg is fertilized, it begins to divide and then gets embedded in the uterus for further development.

Question 34.
What are the changes appears in boys and girls on reaching the adolescence?
Answer:
Changes in boys :

• Muscles of the body grow more prominently.
• Facial hair (beard and moustache) appears.
• Voice becomes hoarse, as voice box enlarges.
• Under shoulder hair and pubic hair appears.

Changes in girls :

• Region below the waist becomes wider.
• Voice pitch increases.
• Breast appears.
• Menstrual cycle begins.
• Under shoulder hair and pubic hair appears.

Question 35.
Name the various secretions (release) of endocrine glands.
Answer:
Endocrine glands release hormones directly into the bloodstream.

Endocrine glands	Hormones secreted
(1) Testes	Testosterone
(2) Ovary	Estrogen
(3) Adrenal	Adrenalin
(4) Thyroid gland	Thyroxin
(5) Pituitary glands	Follicle Stimulation Hormone (FSH), Growth hormone
(6) Pancreas	Insulin.

Multiple Choice Questions (MCQs)

1. What percentage of height does a boy attain at 13 years?
(a) 95%
(b) 88%
(c) 84%
(d) 91%.
Answer:
(b) 88%.

2. At what age does a girl attain 95% height?
(a) 12 years
(b) 15 years
(c) 13 years
(d) 17 years
Answer:
(c) 13 years.

3. At 13 years, a girl is 145 cm tall and a boy is 135 cm tall. Which of the following is likely to happen at 18 years?
(a) The boy will be taller than the girl.
(b) The girl will be taller than the boy.
(c) Both will attain the same height.
(d) The height will depend on the financial status.
Answer:
(a) The boy will be taller than the girl.

Extra Questions for Class 8 Science

Check the below Online Education NCERT MCQ Questions for Class 8 Geography Chapter 4 Extra Questions and Answers Agriculture Pdf free download. https://ncertmcq.com/extra-questions-for-class-8-social-science/

Online Education for Agriculture Class 8 Extra Questions Geography Chapter 4

Class 8 Geography Chapter 4 Extra Questions And Answers Question 1.
What is arable land?
Answer:
The land on which the crops are grown is called arable land.

Agriculture Class 8 Extra Questions Question 2.
Mention the important inputs of agriculture.
Answer:
Seeds, fertilizers, machinery and labour.

Ncert Class 8 Geography Chapter 4 Extra Questions Question 3.
Name the operations involved in agriculture.
Answer:
Ploughing, sowing, irrigation, weeding and harvesting.

Class 8 Geography Chapter 4 Agriculture Extra Questions Question 4.
Mention the outputs of agriculture.
Answer:
Crops, wool, dairy and poultry products.

Class 8 Geography Chapter 4 Extra Questions Question 5.
On what basis can agriculture be classified.
Answer:

• Geographical conditions,
• demand of produce,
• labour,
• level of technology.

Ncert Solutions For Class 8 Geography Chapter 4 Extra Questions Question 6.
Name two major types of farming.
Answer:

1. Subsistence farming
2. Commercial farming.

Class 8 Agriculture Extra Questions Question 7.
What is subsistence farming?
Answer:
Subsistence farming is practised to meet the needs of the farmer’s family.

Agriculture Class 8 Questions And Answers Question 8.
Into which two types can subsistence farming be classified?
Answer:

1. Intensive subsistence,
2. Primitive subsistence farming.

Extra Questions For Class 8 Geography Chapter 4 Question 9.
Name the crops cultivated in intensive subsistence agriculture.
Answer:
Wheat, maize, pulses and oilseeds.

Geography Class 8 Chapter 4 Extra Questions Question 10.
Into which two types can primitive subsistence agriculture be divided?
Answer:

1. Shifting cultivation,
2. nomadic herding.

Chapter 4 Geography Class 8 Extra Questions Question 11.
In which parts of the world is shifting cultivation practised?
Answer:

• Amazon basin,
• Tropical Africa,
• Parts of South-East Asia,
• North-East India.

Class 8 Geography Ch 4 Extra Questions Question 12.
Which types of farming are included in commercial farming?
Answer:

• Commercial grain farming,
• Mixed farming,
• Plantation agriculture.

Extra Questions Of Agriculture Class 8 Question 13.
In the temperate grasslands of North America, why can only a single crop be grown?
Answer:
In the temperate grasslands of North America, only a single crop can be grown because severe winters- restrict the growing season.

Agriculture Class 8 Extra Questions And Answers Question 14.
Name two major plantations found in the tropical regions of the world.
Answer:

1. Rubber plantation in Malaysia
2. Coffee plantation in Brazil
3. Tea plantation in India and Sri Lanka.

Extra Questions On Agriculture Class 8 Question 15.
Name two important food crops, fibre crops and beverage crops.
Answer:

1. Food crops – wheat,
2. rice Fibre crops – jute,
3. cotton Beverage crops – tea, coffee.

Class 8 Geography Agriculture Extra Questions Question 16.
Name four leading producers of rice.
Answer:
China, India, Japan, Sri Lanka.

Agriculture Extra Questions Class 8 Question 17.
Name two places where two to three crops of rice are grown in a year.
Answer:

1. West Bengal,
2. Bangladesh.

Agriculture Class 8 Geography Extra Questions Question 18.
During which season is wheat grown in India?
Answer:
Winters.

Extra Questions Of Chapter 4 Geography Class 8 Question 19.
Name the leading producers of maize.
Answer:
North America, Brazil, China, Russia, Canada, India and Mexico.

Class 8 Chapter 4 Geography Extra Questions Question 20.
In which countries is cotton grown as a major crop?
Answer:
China, USA, India, Pakistan, Brazil and Egypt.

Question 21.
Which countries produce best quality tea in the world?
Answer:
Kenya, India, China, Sri Lanka.

Question 22.
What are primary activities? Give examples.
Answer:
Primary activities include all those activities connected with extraction and production of natural resources. For example, agriculture, fishing, gathering etc.

Question 23.
What are secondary activities? Give examples.
Answer:
Secondary activities are concerned with the processing of natural resources. For example, manufacturing of steel, weaving of cloth etc.

Question 24.
What are tertiary activities? Give examples.
Answer:
Tertiary activities provide support to the primary and secondary sectors through services. For example, trade, banking, insurance etc.

Question 25.
In which parts of the world is nomadic herding practised?
Answer:
Nomadic herding is practised in the following regions –

• Semi-arid and arid regions of Sahara.
• Central Asia.
• Rajasthan and Jammu and Kashmir in India.

Question 26.
Write the main features of commercial farming?
Answer:
Main features of commercial farming are:

• Crops are grown and animals are reared for sale in the market.
• The area cultivated and the amount of capital used is large.
• Most of the work is done by machines.

Question 27.
What is mixed farming? In which parts of the world is it practised?
Answer:

• In the mixed farming, the land is used for growing food and fodder crops and rearing livestock.
• It is practised in Europe, Eastern USA, Argentina, Southeast Australia, New Zealand and South Africa.

Question 28.
Why do is development of a transport network essential for plantation farming?
Answer:
Development of a transport network is essential for plantation farming because the produce is processed on the farm itself or in nearby factories.

Question 29.
Mention the geographical requirements for the cultivation of rice.
Answer:

• It is mainly grown in tropical and sub-tropical regions.
• Rice needs high temperature, high humidity and rainfall.
• It grows well in alluvial clayey soil.

Question 30.
Write the geographical requirements for wheat cultivation.
Answer:

• Wheat requires moderate temperature and rainfall during growing season and bright sunshine at the time of harvest.
• It thrives best in well-drained loamy soil.

Question 31.
Mention the geographical conditions required for maize cultivation.
Answer:

• Maize requires moderate temperature.
• It also needs well-drained fertile soils.

Question 32.
Write the geographical conditions required for cotton.
Answer:

• Cotton requires high temperature, light rainfall, two hundred and ten frost-free days and bright sunshine.
• It grows best on black and alluvial soils.

Question 33.
Mention the geographical conditions required for coffee cultivation.
Answer:

• Coffee requires warm and wet climate and well-drained loamy soil.
• Hill slopes are more suitable for the growth of this crop.

Question 34.
What is agricultural development? Also, write its ultimate aim.
Answer:

• Agricultural development refers to the efforts made to increase farm production in order to meet the growing demand of increasing population.
• Its ultimate aim is to increase food security.

Question 35.
How can farm production be increased?
Or
How can the ultimate aim of agricultural development be increased?
Answer:
Farm production can be increased in the following ways –

• Increasing the cropped area.
• The number of crops grown.
• Improving irrigation facilities.
• Use of fertilizers and high yielding variety of seeds.

Question 36.
On the outline map of India show the following places. Coffee producing state.
Answer:
Coffee producing state

Question 37.
What is sericulture? Name the factors influencing agriculture?
Answer:
Commercial rearing of silkworms is called sericulture. Factors influencing agriculture are as follows :

• Favourable topography
• Soil
• Climate.

Question 38.
Write the main features of intensive subsistence agriculture.
Answer:

• The farmer cultivates a small plot of land using simple tools and more labour.
• Climate with large number of days with sunshine and fertile soil permit growing of more than one crop annually on the same field.
• Major crops grown are rice, wheat, maize, pulses etc.
• Intensive subsistence agriculture is practised in thickly populated areas of the monsoon regions of South, South-East and East Asia.

Question 39.
Write the main features of nomadic herding.
Answer:

• Herdsmen move from place to place with their animals in search of fodder and water.
• Herders have to move from one place to another due to climatic constraints and terrain.
• Sheep, camel, cattle, yak and goats are the most commonly reared.
• Animals provide milk, meat, wool, hides and other products to herders and their families.

Question 40.
Describe the regions where commercial grain farming is practised.
Answer:

• Commercial grain farming is practised in the temperate grasslands of North America, Europe and Asia.
• These regions are sparsely populated with large farms spreading over hundreds of hectares.
• Due to severe winters, only a single crop can be grown.

Question 41.
Write a short note on millets.
Answer:

• Millets are also known as coarse grains and can be grown on less fertile and sandy soils.
• It is a hardy crop that needs low rainfall and high to moderate temperature and adequate rainfall.
• Millets are grown in India, Nigeria, China and Niger.

Question 42.
Write the geographical condi¬tions required for the cultivation of tea.
Answer:

• Tea requires cool climate and well-distributed high rainfall throughout the year for the growth of its tender leaves.
• It needs well-drained loamy soils and gentle slopes.
• Large number of labour is required to pick the leaves.

Multiple Choice Questions (MCQs)

1. ………………………….. is not a tertiary activity.
(a) Trade
(b) Manufacturing
(c) Transport
(d) Banking.
Answer:
(b) Manufacturing

2. Tick the odd pair in the following.
(a) Pisciculture – breeding of fish.
(b) Viticulture – cultivation of grapes.
(c) Horticulture – rearing livestock.
(d) Sericulture – rearing of silkworms.
Answer:
(c) Horticulture – rearing livestock.

3. Organic manure and natural pesticides are used instead of chemicals in this type of farming. What is it called?
(a) Subsistence farming
(b) Shifting cultivation
(c) Mixed farming
(d) Organic farming.
Answer:
(d) Organic farming.

4. Which of the following crops needs high temperature, high humidity, fertile soil and good rainfall?
(a) Rice
(b) Wheat
(b) Cotton
(d) Millets
Answer:
(a) Rice

5. Which of the following pairs is not correct?
(a) Tea – beverage
(b) Jute – Golden Fibre
(c) Wheat – corn
(d) Millets – coarse grains
Answer:
(c) Wheat – corn

Glossary:

→ Primary activities – They include activities connected with extraction and production of natural resources.

→ Secondary activities – These activities are concerned with the processing of natural resources.

→ Tertiary activities – These activities provide support to the primary and secondary sectors through services.

→ Sericulture – Commercial rearing of silkworms.

→ Viticulture – Cultivation of grapes.

→ Pisciculture – Breeding of fish in specially constructed tanks and ponds.

→ Horticulture – Growing vegetables, flowers and fruits for commercial use.

→ Agriculture – The science and art of cultivation on the soil, raising crops and rearing livestock.

→ Subsistence farming- This type of farming is practised to meet the needs of farmer’s family.

→ Nomadic herding – The herdsmen move from one place to another in search of fodder and water.

→ Commercial farming- The crops are grown and animals are reared for sale in the market.

→ Mixed farming – The land is used for growing food and fodder crops and rearing livestock.

→ Organic farming – The use of organic manure and natural pesticides instead of chemicals is known as organic farming.

→ Agricultural development – It refers to efforts made to increase farm production in order to meet the growing demand of increasing population.

Extra Questions for Class 8 Social Science