Question
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?
The correct answer is
The plant appears brighter than the surroundings
Plant Appearance Under Green Light
Green leaves appear green because they contain chlorophyll, a pigment that absorbs red and blue wavelengths of light for photosynthesis but reflects green wavelengths.
In the scenario described:
- Light Condition: The plant is in a dark room illuminated exclusively by green light.
- Light Reflection: Since chlorophyll reflects green light, the green leaves will reflect the available green light.
- Photosynthesis: Photosynthesis requires specific wavelengths (primarily red and blue light). As only green light is present, photosynthetic activity will be negligible. This makes option 4 incorrect.
- Visual Observation: The leaves reflect the green light, making them visible. Compared to the general surroundings (which are also illuminated by the same green light), the reflective nature of the leaf surface causes the plant to appear brighter. Options 2 and 3 are incorrect because the leaves do not absorb green light (ruling out 'darker') and they do reflect light, making them distinguishable.
Therefore, the plant would be observed to appear brighter than the surroundings.
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