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The graph shows the relation between lig...

The graph shows the relation between light intensity and the giving off and taking up of carbon dioxide by the leaves of a plant. Why is most carbon dioxide given off when the light intensity is zero units.

A

because it is just the start of the experiment

B

only respiration is taking place at this intensity of light

C

the rate of photosynthesis is equivalent to the rate of respiration

D

the rate of photosynthesis is more than the rate of respiration

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The correct Answer is:
B
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