Suitable temperature for active absorption of water by root is

40 - 45^{\circ} C

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10 - 15^{\circ} C

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20 - 35^{\circ} C

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Can take at any temperature

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Solution

The correct option is C $20 - 35^{\circ} C$
Active absorption requires input of energy, which is obtained from cellular respiration. Respiration is an enzymatic process and is inhibited at extreme temperatures. Hence, the optimum temperature for active absorption is twenty to thirty five degree celsius.

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20 g

30^{\circ} C

= 1 {cal/g}^{\circ} C

Class	5-10	10-15	15-20	20-25	20-30	30-35	35-40	40-45
Frequency	5	6	15	10	5	4	2	2

Size	5−10	10−15	15−20	20−25	25−30	30−35	35−40	40−45	45−50
Frequency	6	10	18	30	15	12	10	6	4

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