First slide

Factors affecting Photosynthesis

Question

The major limiting factor for photosynthesis is

Easy

A

${CO}_{2}$
B

Light
C

Temperature
D

Water

Solution

The ${CO}_{2}$ concentration in the atmosphere is only 0.03 to 0.04% by volume. But the optimum ${CO}_{2}$ concentration for photosynthesis in $C_{3}$ plants is 0.045% by volume. In $C_{3}$ plants photosynthesis is limited by ${CO}_{2}$ concentration. Only during cloudy days and plants growing in shades, light is the limiting factor.

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