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Chapter: Biology: Physiological Activities in Plants Nutrition

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Factors Affecting Respiration

Affecting Factors may either be external or internal:

Factors Affecting Respiration:

 

Affecting Factors may either be external or internal: -

 

(a) External Factors:

 

1. Temperature: Below 20¡C and above 45¡C the rate of respirationreduces. The optimum temperature for respiration is 20¡C - 45¡C.

2. Oxygen: If the amount of oxygen is reduced the rate of respiration willreduce.

3. Water: Optimum supply of water maintains the rate of respiration normal.Rate of respiration reduces for scarcity of water.

4. Light: The stomata opens in light, so rate of respiration comparatively highin day time.

5. Carbon dioxide: With the increase of CO2in air, rate of respirationdecreases slightly.

 

(b) Internal Factors:

 

1.        Food materials: During respiration food materials break to release water andCO2. So the quality and quantity of food materials in the cell regulates the rate of respiration.

 

2.      Age of cell: Rate of respiration is maximum in young cells especially inmeristamatic cells (as there is much protoplasm).

 

3.        Enzymes: Different reactions of respiration need different kinds of enzymes.The process completely depends on their presence.

 

4.        Inorganic salts: Rate of respiration increases if there is more inorganic salts in the cell.

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