Water moves up against gravity and even for a tree of $20$ m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is ____________.

Cohesive forces

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Adhesive forces

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Transpiration pull

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Root pressure

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Solution

The correct option is B Transpiration pull
According to transpiration pull theory, due to transpiration, the water column inside the plant comes under tension. This is called 'transpiration pull'. On account of this tension, the water column is pulled up passively from below to top of the plant(almost like a rope). A tension of one atmosphere is sufficient to pull water to a height of about $20$ meters.
So, the correct answer is 'Transpiration pull'

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Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is ____________.

Water moves up against gravity and even for a tree of $20$ m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is ____________.