DENDROLOGY

TREE PHYSIOLOGY

TRANSPIRATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why is the evaporation of water from leaves important?
A
It cools leaves and helps move water up the plant.
B
It makes the plant wilt
C
It helps the plant to respire
D
None of the above
Explanation: 

Detailed explanation-1: -It maintains osmosis and keeps the cells rigid. A suction force is created by transpiration that helps in the upward movement of water in the plants. Certain hydrophilic salts are accumulated on the surface of the leaves, which keeps the leaves moist.

Detailed explanation-2: -Much of the water that soaks into the soil from irrigation or rain ultimately returns the the atmosphere as water vapor through direct evaporation from the surface or by transpiration through plant leaves as the plants use the water for growth and seed production.

Detailed explanation-3: -The typical plant, including any found in a landscape, absorbs water from the soil through its roots. That water is then used for metabolic and physiologic functions. The water eventually is released to the atmosphere as vapor via the plant’s stomata-tiny, closeable, pore-like structures on the surfaces of leaves.

Detailed explanation-4: -Transpiration is a process that involves loss of water vapour through the stomata of plants. The loss of water vapour from the plant cools the plant down when the weather is very hot, and water from the stem and roots moves upwards or is ‘pulled’ into the leaves.

Detailed explanation-5: -Evaporation from the mesophyll cells produces a negative water potential gradient that causes water to move upwards from the roots through the xylem. Inside the leaf at the cellular level, water on the surface of mesophyll cells saturates the cellulose microfibrils of the primary cell wall.

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