Factors affecting photosynthesis
Class X > Biology > Photosynthesis
There are three internal factors and four external factors which affect photosynthesis :
(i) Chlorophyll – Nutritional deficiencies of mineral cause loss of chlorophyll, and hence the drop in trapping solar energy which reduces the rate of photosynthesis.
(ii) Protoplasm – Dehydration of protoplasm reduces the rate of photosynthesis.
(iii) Structure of leaf – Thickness of cuticles, distribution of stomata and size of the leaf influence the amount of light and the amount of CO2 entering the leaf which affects the rate of photosynthesis.
(i) Light intensity – The rate of photosynthesis increases with light intensity.
(ii) Carbon dioxide concentration – The rate of photosynthesis increases with carbon dioxide concentration in the environment.
(iii) Temperature – With the rise in temperature, the rate of photosynthesis rises. This rise occurs up to the optimum temperature of 35oC after which the rate falls and stops above 40oC.
(iv) Water content – The scarcity of water due to reduced absorption from the soil or due to an excessive loss through transpiration reduces the rate of photosynthesis.