Question

question 4
during any 24 - hour period, which substance(s) do green plants continuously require and use to stay alive?

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

Explanation:

Green plants perform respiration continuously, which requires oxygen. During the day, they also perform photosynthesis which requires carbon - dioxide. So they need both carbon dioxide and oxygen over a 24 - hour period.

Answer:

D. both carbon dioxide and oxygen