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Factors Affecting Photosynthesis

The external ...

Question

The external factor that is rarely a limiting factor and the factor that is a major limiting for photosynthesis, respectively, are

A

CO₂ and temperature

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B

Light and CO₂

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C

CO₂ and H₂O

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D

Temperature and light

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Solution

The correct option is B
Light and CO₂

Light saturation of photosynthesis occurs at $10 %$ of full sunlight. Hence light is rarely a limiting factor in nature. $C O_{2}$ makes up just $0.03 %$ of the earth's atmosphere and thus is a major limiting factor for photosynthesis.

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