Optimum temperature for water absorption by plants is

0^{o} - 5^{o} C

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5^{o} - 20^{o} C

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25^{o} - 35^{o} C

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40^{o} - 50^{o} C

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Solution

The correct option is D $25^{o} - 35^{o} C$
Temperature about 30°C favours water absorption. At higher temperatures water absorption is decreased. Also, low temperature decreases the permeability of the cell membrane. Metabolic activities of the root cells are decreased below the optimum temperature.
So the correct answer is '25°C - 35°C'.

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