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Question

For the same amount of CO2 fixed, a C4 plant, in comparison with a C3 plant, loses only

A
Half amount of water
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B
Equal amount of water
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C
Double amount of water
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D
None of these.
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Solution

The correct option is A Half amount of water
Answer is option A i.e. "Half amount of water"
C4​ plant loses half as much as water as a C3​ plant as C4​ plants need not to open their stomata for long to take in carbon dioxide due to high efficiency of the C4​ pathway and this reduces water loss due to transpiration. The water loss per gram of biomass produced with C3 cycle is high (450-950). However, the water loss per gram of biomass produced with C4 cycle is low (250-350)

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