Write down any three external factors, that affect respiration in plants.

Explanation

(i) Optimum temperature for respiration is `30^(@)C`. At low temperatures and very high temperature rate of respiration decreases.
(ii) When sufficient amount of `O_(2)` is available the rate of aerobic respiration will be optimum and anaerobic respiration is completely stopped. This is called Extinction point.
(iii) High concentration of `CO_(2)` reduces the rate of respiration