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7. Look at the leaves of the same plant on the shady side and compare them with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?

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Light is a limiting factor for photosynthesis. Leaves get less light for photosynthesis when they are in shade. Therefore, the leaves or plants in the shade perform less photosynthesis as compared to the leaves or plants kept in sunlight. The leaves in shade are much greener than the ones exposed to sunlight for the following reasons. 

  1. The chloroplasts of the mesophyll cells are irregularly arranged, and their orientation is in vertical files along the walls in strong light.
  2. Photooxidation of chloroplasts occurs in bright light and its non-oxidation occurs in shaded areas.
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Sonika

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