Question

Green plants do not give out CO${}_2$ during day time because they

• A. Store the same
• B. Respire very slowly
• C. Do not respire
• D. Consume it in photosynthesis

Answer 1

The correct option is D Consume it in photosynthesis

Though plants release carbon dioxide during the day yet it is not released out. This is because carbon dioxide generated during daytime is used by the plants in the process of photosynthesis. While using CO2 in the presence of sunlight, they produce glucose and oxygen thus counter balancing CO2 release.

So, the correct option is 'Consume it in photosynthesis'.