Leaves of green plants contain openings known as stomata these are opened and closed by specialized cells that allow gases to be exchanged between the leaf and the outside environment which of the following best describes the flow of gases into and out of a leaf through stomata on a sunny day?

Question

A. Water vapor and ozone move in; carbon dioxide moves out
B. Oxygen moves in; nitrogen moves out
C. Carbon dioxide and oxygen move in; ozone moves out
D. Carbon dioxide moves in; oxygen moves out

Answer 1

The correct answer is D. Carbon dioxide moves in; oxygen moves out.

On a sunny day, plants undergo photosynthesis, during which they take in carbon dioxide from the atmosphere through the stomata. At the same time, they release oxygen as a byproduct of photosynthesis. Thus, carbon dioxide enters the leaf while oxygen exits.