Question

Which of the following best describes a challenge for C3 photosynthesis under hot conditions?

A. When stomatal cells close, photorespiration increases and CO2 is lost.

B. C3 plants have to spend energy to store carbon in a separate specialized cell.

C. They can reduce water loss by closing their stomatal cells.

D. Rubisco has a higher affinity for CO2, making the rate of photosynthesis too rapid.

Answer 1

Answer-

According to the given question-challenge for C3 photosynthesis under hot conditions-

(A)   when plant closes its  stomata to reduce water loss because of hot conditions the concentration of Oxygen increases inside the leaf making Rubisco enzyme have more affinity towards oxygen rather than the carbon dioxide, leads to increase in photorespiration and the concentration of carbon dioxide decreases.

(B)- During hot conditions the rate of photosynthesis decreases so no need to store carbon.

(C) During hot condition the plant leaf closes their stomata to prevent water loss.

(D) During hot condition rate of photosynthesis decreases because Rubisco have more affinity for oxygen.

According to the given options the most correct answer is (A) i.e. during hot condition when stomata close the rate of photorespiration increases and CO² is lost.