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Variegated leaves of a plant were supplied with radioactive carbon dioxide during an experiment.

Leaf X was kept in the dark and leaf Y was kept in the light. At the end of the experiment, the radioactivity in the leaves was measured and found to be as shown in the diagram below. What is the most likely explanation for the level of radioactivity found in the yellow zone of Y?

Photosynthesis occurs but no storage of strach occurs in this zone.
Radioactive carbon dioxide diffuses into leaf and accumulates here.
Products of photosynthesis diffuse into the yellow zone.
Photosynthesis proceeds slowly in the absence of chlorophyll-a and b.

A

Radioactive carbon dioxide diffuses into leaf and accumulates here.

B

Photosynthesis occurs but no storage of strach occurs in this zone.

C

Products of photosynthesis diffuse into the yellow zone.

D

Photosynthesis proceeds slowly in the absence of chlorophyll-a and b.

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Solution

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When variegated leaves of a plant were supplied with radioactive carbon dioxide during an experiment; leaf X when kept in dark and leaf Y in light at the end of the experiment, products of photosynthesis diffuse into the yellow zone. It is because light is an important limiting factor for photosynthesis.

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