When a photosynthetic plant is transferred to an atmosphere of enriched $O_{2}$ its rate of

Photosynthesis would increase.

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Photosynthesis would decrease.

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Respiration would decrease.

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Osmosis would increase.

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Solution

The correct option is B Photosynthesis would decrease.
There are several factors proposed by Blackmann which are the limiting factors of photosynthesis. Rate of photosynthesis will reduce when the photosynthetic plant is transferred to an atmosphere with more oxygen concentration.

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