PLANT PHYSIOLOGY
PLANT MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Transpiration causes water to move down a series of water potential gradients.
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The loss of water vapour through the stomata leads to a decrease in the water potential of air spaces.
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Water always moves from a low to a high water potential.
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Cohesion forces causes water molecules to be drawn up the stem of the plant.
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Detailed explanation-1: -Transpiration causes water to move down a series of water potential gradients. The loss of water vapour through the stomata leads to a decrease in the water potential of air spaces. Water always moves from a low to a high water potential. Cohesion forces causes water molecules to be drawn up the stem of the plant.
Detailed explanation-2: -Bleeding is not related to transpiration.
Detailed explanation-3: -Transportation of sugars from source to sink is a physiological process and is not related to transpiration.
Detailed explanation-4: -A transpiration pull could be simply defined as a biological process in which the force of pulling is produced inside the xylem tissue. This force helps in the upward movement of water into the xylem vessels. In this process, loss of water in the form of vapours through leaves are observed.
Detailed explanation-5: -Water potential is lowered by transpiration from the leaves assisted by the cohesive forces between water molecules causing water to be under tension, i.e., under negative pressure.