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Most plants are green in colour because:

1. the atmosphere filters out all the colours of the visible light spectrum except green
2. green light is the most effective wavelength region of the visible spectrum in sunlight for photosynthesis
3. chlorophyll is least effective in absorbing green light
4. green light allows maximum photosynthesis

Correct answer: chlorophyll is least effective in absorbing green light

Solution

Chlorophyll absorbs red and blue light much more strongly than green light. Because green light is absorbed least, it is mostly reflected, making plants appear green.

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