Q. Assertion (A) The light reaction is temperature sensitive.
Reason (R) Change in temperature affects light reaction more than dark reaction.

 848  150 Photosynthesis in Higher Plants Report Error

Solution:

Assertion is true, but Reason is false. The light reaction and dark reacitons are both temperature sensitive.
Reason can be corrected as
The dark reaction is enzymatic thus affected by change in temperatrue much more than light reaction.