On hot bright days when transpiration from leaves is rapid, the stems of many plants actually shrink though slightly. It is because of

Upward rise of water column

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presence of air bubbles at places

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tensions in water columns

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Plasmolysis of xylem cells

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Solution

The correct option is C
tensions in water columns

Low water potential can cause shrinkage of xylem diameter during summer. Water potential could be expected to have similar dynamics in xylem vessels and parenchyma cells in these conditions since transpiration-induced water tension in the xylem vessels leads to dehydration of living tissues.

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Similar questions

Give suitable explanation for the following :

(a) A higher rate of transpiration is recorded on a windy day rather than on a calm day.

(b) Excessive transpiration results in the wilting of the leaves.

(d) More transpiration occurs from the lower surface of a dorsiventral leaf.

(e) Cork and bark of trees help in preventing loss of water.

(f) Perspiration and transpiration help to cool the body temperature of the organism.

(g) On a bright sunny day, the leaves of certain plants roll up.

Q. Identify the process where root pressure is not involved -
A. Oozing out of sap from the cut end of stem.
B. Loss of water vapor from the aerial parts of plant.
C. Re-establishment of continuity of water column in the xylem which often break due to tension.
D. Water loss in liquid phase from vein endings of leaves.

Q. Identify the process where root pressure is not involved -
A. Oozing out of sap from the cut end of stem.
B. Loss of water vapour from the aerial parts of plant.
C. Reestablishment of continuity of water column in the xylem which often breaks due to tension.
D. Water loss in liquid phase from vein endings of leaves.

Identify the process where root pressure is not involved -
A. Oozing out of sap from the cut end of stem.
B. Loss of water vapor from the aerial parts of plant.
C. Reestablishment of continuity of water column in the xylem which often break due to tension.
D. Water loss in liquid phase from vein endings of leaves.

Q. In tall plants, because of which factor, continuous water column extends upward?

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