Question

Carbon dioxide is important for the living world because

• A. it is at the roots of the entire food chain
• B. animals use it for photosynthesis
• C. plants use it for respiration
• D. animals use it for respiration

Answer 1

The correct option is A

it is at the roots of the entire food chain

1. Photosynthesis is done only in plants with the help of carbon dioxide therefore options b,c and d are incorrect options.
2. Plants are at the rood of food chain and they produce oxygen by the process of photosynthesis with intake of carbon dioxide ,in presence of sunlight and chlorophyll.
3. Therefore we can say that carbon dioxide is at root of the food chain,therefore the correct answer is option A.