Routinely, in nature, during a 24-hour period in nature, what substance do green plants continuously require and use?

Question

a
both carbon dioxide and oxygen
b
carbon dioxide, only
c
oxygen
d
both carbon dioxide and nitrogen

Answer 1

The correct answer is: b. carbon dioxide, only.

During photosynthesis, which occurs primarily in daylight, green plants take in carbon dioxide and release oxygen. However, at night, plants continue to respire, using oxygen and releasing carbon dioxide. Therefore, over the course of a 24-hour period, plants primarily require carbon dioxide for photosynthesis and use oxygen during respiration.