Question

What happens when the incident light on a plant is excessive?

(a) RuBP undergoes oxidation

(b) Vascular bundles lose functionality

(c) Mesophyll cells are destroyed

(d) Chlorophyll breaks down

This question was posed to me in class test.

I would like to ask this question from Factors Affecting Photosynthesis topic in section Photosynthesis in Higher Plants of Biology – Class 11

Answer 1

Correct choice is (d) Chlorophyll breaks down

The best I can explain: Light is rarely a limiting factor for photosynthesis, but excess amount of light reaching the photosynthetic parts of plant causes the breakdown of chlorophyll and hence, reduces the rate of photosynthesis.