Photosynthesis Question 17

17. At a temperature above $35^{\circ} C$

[1992]

(a) rate of photosynthesis will decline earlier than that of respiration

(b) rate of respiration will decline earlier than that of photosynthesis

(c) there is no fixed pattern

(d) both decline simultaneously

Show Answer

Answer : a

Hints & Solution

(a) The optimum temperature of photosynthesis is $10^{\circ}-25^{\circ} C$ for $C_3$ plants and $30^{\circ}-45^{\circ} C$ for $C_4$ plants.