Photosynthesis

AP Biology· difficulty 3/5

A leaf is exposed to varying CO2 at two light intensities.

What does the difference between the two plateaus indicate?

A
$At low light, light is the limiting factor; CO2 cannot raise the rate further$
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B
$CO2 inhibits chlorophyll at low light$
C
$Higher CO2 reduces ATP needs at low light$
D
$Low light increases CO2 affinity$

Explanation

The plateau is set by the most limiting factor. At low light, the Calvin cycle cannot use additional CO2 because ATP/NADPH production is light-limited.

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