A) internal factors affecting transpiration
B) external factors affecting photosynthesis
C) external factors affecting growth
D) internal factors affecting respiration
Correct Answer: B
Solution :
A limiting factor is defined as a factor which is deficient to such an extent that increase in its magnitude directly increases the rate of the process. The effect of limiting factors was studied by Blackmann in 1905. It is concerned with external factors affecting photosynthesis.
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