NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants are part of NCERT Solutions for Class 7 Science. Here we have given NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants.

 Board CBSE Textbook NCERT Class Class 7 Subject Science Chapter Chapter 1 Chapter Name Nutrition in Plants Number of Questions Solved 13 Category NCERT Solutions

## NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants

Question 1.
Why do organisms need to take food?
Organisms need to take food to

1. get the energy to do work.
2.  build up the body.
3. repair damages in the body.
4.  maintain the functions of the body.

Question 2.
Distinguish between a parasite and a saprotroph.

 Parasite Saprotroph 1. A parasite takes the food from the organism on which it survives. 1. They secrete digestive juices on the dead and decaying matter and convert it into a solution 2. They feed on a living organism. 2. They feed on dead and decaying matter. 3. The organism on which it survives is called host. 3. They do not feed on a living organism. 4. It deprives the host of valuable nutrients. 4. There is no host at all.

Question 3.
How would you test the presence of starch in leaves?

1. Take two healthy green potted plants of the same kind in order to remove all the starch from the leaves.
2.  Keep one in the darkroom (or in a black box) for 72 hours and the other in the sunlight.
3.  Now, take one leaf from each of the plants.
4. Put few drops of iodine solution on each of the leaves.
5.  The leaf kept in the sunlight will turn blue-black due to the presence of starch.
6. The leaf kept in the dark will not turn blue-black because of the absence of starch.

Question 4.
Give a brief description of the process of synthesis of food in green plants.
The leaves of a plant have a green pigment called chlorophyll. In the presence of sunlight, they use carbon dioxide and water to synthesize carbohydrates.
Carbon dioxide + Water $$\xrightarrow [ Sunlight ]{ Chlorophyll }$$ Carbohydrade + Water + Oxygen
During the process, oxygen is released. The carbohydrates ultimately get converted into starch.
Carbon dioxide from the air is taken through stomata. Water and minerals are absorbed by the roots and transported to the leaves.

Question 5.
Show with the help of a sketch that plants are the ultimate source of food.

Fig. Plants capture solar energy by a unique process called photosynthesis

Question 6.
Fill in the blanks:

1. Green plants are called …….. since they synthesize their own food.
2. The food synthesized by the plants is stored as ………
3. In photosynthesis solar energy is captured by the pigment called ……….
4. During photosynthesis plants take in ……… and release ……….

1. autotrophs
2. starch
3. chlorophyll
4. carbon dioxide, oxygen

Question 7.
Name the following:

1. A parasitic plant with a yellow, slender, and branched stem.
2. A plant that is partially autotrophic.
3. The pores through which leave exchange gases.

1. Cuscuta
2. Insectivorous plants
3. Stomata

Question 8.
(a) Amarbel is an example of:
(i) Autotroph
(ii) Parasite
(iii) Saprotroph
(iv) Host
(b) The plant which traps and feeds on insects is:
(i) Cuscuta
(ii) China rose
(iii) Pitcher plant
(iv) Rose
(ii) Parasite
(iii) Pitcher plant

Question 9.
Match the items given in Column I with those in Column II.

 Column I Column II Chlorophyll Bacteria Nitrogen Heterotrophs Cuscuta Pitcher plant Animals Leaf Insects Parasite

 Column I Column II Chlorophyll Leaf Nitrogen Bacteria Cuscuta Parasite Animals Heterotrophs Insects Pitcher plant

Question 10.
Mark T if the statement is true and ‘F’ if it is false:
(i) Carbon dioxide is released during photosynthesis. (T/F)
(ii) Plants which synthesize their food are called saprotrophs. (T/F)
(iii) The product of photosynthesis is not a protein. (T/F)
(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)
(i) F
(ii) F
(iii) T
(iv) T

Question 11.
Choose the correct option from the following:
Which part of the plant takes in carbon dioxide from the air for photosynthesis?
(i) Root hair
(ii) Stomata
(iii) Leaf veins
(iv) Petals
(ii) Stomata

Question 12.
Choose the correct option from the following:
Plants take carbon dioxide from the atmosphere mainly through their:
(i) roots
(ii) stem
(iii) flowers
(iv) leaves