Question

If a single-celled alga is placed in an environment with limited light and low oxygen, what would most likely happen to its ability to cycle matter and energy?





A.
Photosynthesis and respiration would both increase due to stress.

B.
Photosynthesis would increase, and respiration would remain unchanged

C.
Photosynthesis would decrease, reducing glucose production and limiting respiration

D.
Respiration would increase to compensate for reduced photosynthesis.

Answer 1

C

Limited light reduces photosynthesis, so the alga makes less glucose. With less fuel (and with low O2 limiting aerobic respiration), overall respiration would be reduced/limited.