Question

Why do stomata close during water shortage?

(a) To reduce CO2 availability

(b) To trap water

(c) To increase metabolic activity

(d) To increase the surface area of leaves

This question was posed to me in examination.

Origin of the question is Factors Affecting Photosynthesis in portion Photosynthesis in Higher Plants of Biology – Class 11

Answer 1

Right option is (a) To reduce CO2 availability

The best explanation: During water shortage in plants, the stomata close in order to reduce the availability of carbon dioxide for carbon dioxide fixation, which is the first part of the Calvin cycle of photosynthesis.