ScienceClass 7CBSE
Q
Which of the following serve as green lungs? (a) The green pigment of the plants (b) Forests (c) Kitchen gardens (d) Greenhouse gases
A
Soln:
Answer is (b) Forests
Explanation:
Plants release oxygen during photosynthesis which is used by all the organisms. Plants help to maintain the concentrations of CO2 and Oxygen. Hence they are called as green lungs.