Check the below Online Education NCERT MCQ Questions for Forests: Our Lifeline Class 7 Extra Questions and Answers Science Chapter 17 Pdf free download. https://ncertmcq.com/extra-questions-for-class-7-science/
Online Education for Class 7 Science Chapter 17 Extra Questions and Answers Forests: Our Lifeline
Class 7 Science Chapter 17 Extra Questions Question 1.
Write one food chain in forest.
Answer:
Grass → insects → frog → snake → eagle.
Forest Our Lifeline Class 7 Extra Questions With Answers Question 2.
Which type of environment remains in a forest?
Answer:
Forest environment is peaceful and a cool breeze keeps blowing because of transpiration by plants.
Ncert Solutions For Class 7 Science Chapter 17 Extra Questions Question 3.
Name two trees found in forests.
Answer:
Neem, Sheesham.
Forest Our Lifeline Class 7 Worksheet With Answers Question 4.
Name some animals that live deep inside forest.
Answer:
Animals like boar, bison, jackals, porcupine, elephants live in the deeper areas of the forest.
Forest Our Lifeline Class 7 Questions Answers Question 5.
What do the forests provide to the human beings?
Answer:
Many people live in the forest. Some of them may belong to different tribes. These people depend mostly on the forests. The forest provides them with food, shelter, water and medicines. In additional, human extracts timber, pulp, resin, gum etc. from forest for his use.
Class 7 Forest Our Lifeline Extra Questions Question 6.
How is forest beneficial for the environment for man living nearby forest?
Answer:
Due to the surrounding forests, they receive good rainfall. The air also remains cool. Noise pollution too is less because the forest absorbs the noise of the nearby highway.
Forest Class 7 Extra Questions And Answers Question 7.
What puts pressure on forest?
Answer:
Construction of roads, buildings, industrial development and increasing demand of wood create pressure on the forests.
Class 7 Science Ch 17 Extra Questions Question 8.
Sum up the importance of forests.
Answer:
Forests provide us with oxygen. They protect soil and provide habitat to a large number of animals. Forests help in bringing good rainfall in neighbouring areas. They are a source of medicinal plants, timber and many other useful products.
Forest Our Lifeline Class 7 Questions Question 9.
Why are forests called green lungs?
Answer:
Plants release oxygen through the process of photosynthesis. The plants help to provide oxygen for animal respiration. They also maintain the balance of oxygen and carbon dioxide in the atmosphere. That is why forests are called green lungs.
Forest Our Lifeline Class 7 Extra Questions Question 10.
Draw a figure to show the dependence of plants, soil, and decomposers in a forest.
Answer:
Ncert Class 7 Science Chapter 17 Extra Questions Question 11.
Why is forest called dynamic living entity?
Answer:
By harbouring greater variety of plants, the forest provides greater Opportunities for food and habitat for the herbivores. Larger number of herbivores means increased availability of food for a variety of carnivores. The wide variety of animals helps the forest to regenerate and grow. Decomposers help in maintaining the supply of nutrients to the growing plants in the forest. Therefore, the forest is a ‘dynamic living entity’ – full of life and vitality.
Ch 17 Science Class 7 Extra Questions Question 12.
Explain why there is a need of variety of animals and plants in a forest.
Answer:
Variety of animals are necessary for their survival and maintenance of food chain. For example, grass is eaten by insects, which in turn, is eaten by the frog. The frog is consumed by snakes which is eaten by eagles.
Thus, it forms a food chain:
Grass → insects → frog → snake → eagle.
Many food chains can be found in the forest. All food chains are linked. If any one food chain is disturbed, it affects other food chains. Every part of the forest is dependent on the other parts. If we remove one component, say trees, all other components would he affected.
Class 7 Science Forest Our Lifeline Extra Questions With Answers Question 13.
Why should we worry about the conditions and issues related to forests far from us?
Answer:
Forests are very helpful for us. They clean air, play a vital role in water cycle, provide various items and so on. So, we should worry about the conditions and issues related to forests far from us.
Forest Our Lifeline Class 7 Worksheet Question 14.
In which layer of the soil would you find humus? What is its importance to the soil?
Answer:
Humus is found in the top layer of soil. The presence of humus ensures that the nutrients of the dead plants and animals are
released into the soil. From there, these nutrients are again absorbed by the roots of the living plants.
Class 7 Science Chapter 17 Extra Question Answer Question 15.
Explain how animals dwelling in the forest help it grow and regenerate.
Answer:
Animals helps in dispersing seeds of certain plants. The decaying animal dung also provides nutrients to the seedling to grow. This is how animals help the forest to grow and regenerate.
Questions On Forest Our Lifeline Class 7 Question 16.
Explain how forests prevent floods.
Answer:
Plants acts as a natural observer of rainwater and allow water to seep slowly to recharge groundwater. This is how forests help preventing floods.
Extra Questions Of Forest Our Lifeline Class 7 Question 17.
What are decomposers? Name any two of them. What do they do in the forest?
Answer:
The micro-organisms which convert the dead plants and animals to humus are known as decomposers. Bacteria, mushrooms, etc. are decomposers. They decompose dead organisms and provide nutrients to trees.
Extra Questions For Class 7 Science Chapter 17 Question 18.
Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Answer:
Plants take in CO2 and release oxygen in the process of photosynthesis. Thus, they maintain the balance of oxygen and carbon dioxide in the atmosphere.
Multiple Choice Questions
1. Which of the following is not a product of forest?
(i) Fuelwood
(ii) Polythene
(iii) Gums
(iv) Medicinal plants.
Answer:
(ii) Polythene.
2. The branches of the tall trees, look like a roof over the other plants in the forest. This is known as :
(i) crown
(ii) canopy
(iii) cap
(iv) super cap.
Answer:
(ii) canopy.
3. The branchy part of a tree above the stem is known as :
(i) crown
(ii) canopy
(iii) cap
(iv) super cap.
Answer:
(i) crown.
4. Which of the following statements is true?
(i) We see similar kind of trees in every forest.
(ii) We see only one type of tree in whole fores
(iii) We see different kind of trees in every forest due to climate difference.
(iv) We see different in of trees in every forest because of distinct wildlife.
Answer:
(iii) We see different kind of trees in every forest due to climate difference.
5. The layer of forest vegetation from top to bottom is in sequence as :
(i) trees, herbs, shrubs
(ii) trees, shrubs, herbs
(iii) herbs, shrubs, trees
(iv) herbs, trees, shrubs.
Answer:
(ii) trees, shrubs, herbs.
6. Decomposition of any organic matter is accompanied with the :
(i) release of heat energy.
(ii) absorption of heat energy.
(iii) release of light energy.
(iv) absorption of light energy.
Answer:
(i) release of heat energy.
7. Who are the ultimate source of food in food chain?
(i) Autotrophs
(ii) Heterotrophs
(iii) Saprotrophs
(iv) None of these.
Answer:
(i) Autotrophs.
8. Which of the following statements is not correct?
(i) Forests protect the soil.
(ii) In forests, plants & animals depend on one another.
(iii) Forests have no influence on climate.
(iv) Soil helps forests to grow and regenerate.
Answer:
(iii) Forests have no influence on climate.
9. which of the following is not correct about deforestation?
(i) It will increase CO2 concentration in atmosphere.
(ii) It will result in loss of habitat of wild animals.
(iii) Soil erosion will take place.
(iv) A sustainable development can be achieved by it.
Answer:
(iv) A sustainable development can be achieved by it.
Keywords:
→ Canopy: The branches of the tall trees look like a roof over the other plants in the forest. This is called canopy.
→ Crown: Branchy part of a tree above the stem is known as the crown.
→ Decomposers: The micro-organisms which convert the dead plants and animals to humus are known as decomposers.
→ Deforestation: Cutting of forests is called deforestation.
→ Humus: The decomposed organic matter content of soil is called humus.
→ Regeneration:‘ The ability to restore lost or damaged tissues, organs or limbs.