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Which forces are helpful in movement of water upwards in xylem tissue.???

Posted by ? Ishika ?? 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 7 months ago

Upward movement of water through xylem is best explained by cohesion theory. It states that cohesion pull is responsible for movement of water in the xylem. The force of cohesion tension exceeds root pressure on a sunny day because on a sunny day the rate of transpiration is high. The water is lost from guard cell which leads to decrease in the water potential of guard cell as compared to the surrounding cell. To stabilize the water potential in the guard cell water rushes from the neighboring cell which creates a cohesion pull in the xylem vessels to pull the water up to the guard cell.

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CBSE > Class 10 > Science