Respiration:
A)occurs only when the Sun is shining.
B)releases oxygen into the air.
C)must give off less carbon than is fixed through photosynthesis if a plant is to experience net growth.
D)does not affect the concentration of carbon dioxide in the atmosphere.

Question

Quizplus · Accepted Answer

Respiration in plants requires the uptake of oxygen and release of carbon dioxide, which is the opposite of photosynthesis. If a plant releases more carbon dioxide than it fixes through photosynthesis, it will experience net loss and reduced growth. Therefore, respiration must give off less carbon than is fixed through photosynthesis for plant growth. Choices A, B, and D are incorrect as they are either not related to respiration or are incorrect statements about its effects on the atmosphere.