Most plant leaves take in more carbon dioxide as light increases. They give off carbon dioxide if light intensity is too low. The graph shows a plant's carbon dioxide levels at
different light intensities.
Plant Carbon Dioxide at Different Light Intensities
Net
photosynthesis
coExchange
More carbon
dioxide taken
in by plant
than given off
5,000
10,000
15,000
20,000
More carbon
dioxide given
off by plant
than taken in
Light Intensity
(candelas)
MAt point X, the rate of which process is equal to the rate of photosynthesis?
A Cellular respiration
B Transpiration
С Growth
D Reproduction