‘A’ has more effect on plant rather than on photosynthesis. ‘B’ has no effect on C₄ plants but has inhibitory effect on C₃ plants. The present levels of C in the atmosphere has an effect on C₃plants but not C₄ . What are A, B and C ?

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Water, carbondioxide, oxygen

Carbondioxide, water and oxygen

Water, oxygen and carbondioxide

Oxygen, water and carbondioxide

answer is C.

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Detailed Solution

Water has no direct effect on photosynthesis. But water stress causes the stomata to close hence reducing the CO₂availability. Besides, water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well. More oxygen levels causes photorespiration in C₃plants. Current availability of CO₂levels is limiting to the C3 plants.

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