CBSE NCERT Solutions for Class 7 Science Chapter 11

NCERT science solutions for class 7 are extremely helpful for students having trouble in solving difficult problems. The NCERT solutions will also help students to retain the information for a longer period of time.

CBSE NCERT Solutions for Class 7 Science Chapter 11:

Question-1:

Water absorption through roots can be increased by keeping the plants
Option A: in the shade
Option B: in dim light
Option C: under the fan
Option D: covered with a polythene bag

Solution:

Correct option: C
Water absorption through roots can be increased by keeping the plants under the fan.

Question-2:

Why is transport of materials necessary in a plant or in an animal? Explain.

Solution:

(i) Transport of materials in plant and animal is necessary for carrying out
metabolic activities such as cellular respiration to release the energy by breaking down nutrients.
(ii) Transportation of materials help in the supply of nutrients and energy to each and every part of animals and plants.
(iii) Also, the waste materials produced during metabolic activities are toxic and hence need to be removed from the body by transportation.

Question-3:

What will happen if there are no platelets in the blood?

Solution:

Platelets serve to release the clotting factors which in turn help in the clotting of blood at the time of injury. If there would be no platelets, then there would be no clotting of blood and person may die due to excess loss of blood from the body.

Question-4:

What are stomata? Give two functions of stomata.

Solution:

The tiny pores or openings present on the surface of leaves of the plants are
called stomata. Two functions of stomata:
(i) It helps in evaporation of water through the process of transpiration
(ii) It helps in exchange of gases which takes place inside the plant cells.

Question-5:

Why is blood needed by all the parts of a body?

Solution:

Blood is needed by all the parts of the body because:
(i) It carries oxygen to all the parts of the body and also carries carbon dioxide back to the lungs.
(ii) It carries digested food to various parts of the body for absorption.
(iii) It contains platelets which help in the clotting of blood.
(iv) It helps in maintaining constant body temperature.
(v) It transports hormones and help in fighting the body with germs and bacteria.