UPSC Prelims PYQ 2007: Which light types are strongly absorbed by plants?

Which of the following types of light are strongly absorbed by plants?

1. Violet and orange
2. Blue and red
3. Indigo and yellow
4. Yellow and violet

Explanation

Option (b) is correct

• Plants strongly absorb blue and red light for photosynthesis because chlorophyll pigments absorb these wavelengths most efficiently, while green light is mostly reflected

Ans: (b) Blue and red