First slide

Factors affecting Photosynthesis

Question

Which of the following does not represent the internal factors which affect photosynthesis?

Easy

A

Atmospheric ${CO}_{2}$ concentration
B

Number and size of leaves.
C

Age of leaf and orientation
D

Internal ${CO}_{2}$ concentration and amount of chlorophyll.

Solution

Atmospheric ${CO}_{2}$ concentration, light, water and temperature are the external factors that affect photosynthesis. Internal factors which affect photosynthesis include the number, size, age and orientation of leaves, mesophyll cells and chloroplasts, internal ${CO}_{2}$ concentration and the amount of chlorophyll. The plant or internal factors are dependent on the genetic predisposition and the growth of the plant.

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