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If a plant with green leaves is kept in a dark room with only green light on, which one of the following would we observe?

This question was previously asked in
CSIR-UGC (NET) Life Science: Held on (17 Feb 2022 Shift 1)
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  1. The plant appears brighter than the surroundings.
  2. The plant appears darker than the surroundings.
  3. We cannot distinguish the plant from the surroundings.
  4. It will have above normal photosynthetic activity.

Answer (Detailed Solution Below)

Option 1 : The plant appears brighter than the surroundings.
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Detailed Solution

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Explanation:

Whenever a ray of light falls on a substance, then either it reflects the light or absorbs it.

The color which is reflected by the substance appears to be its color to the human eye. All other colors are absorbed by the substance and are not visible to the eye.

Hence, when a plant with green leaves is kept in a dark room with only green light on, then it will reflect all the green light and appears brighter than the surrounding.

∴ The plant will appear brighter than the surroundings.

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