Question

what is transpiration and transportation pull
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Answer 1

Answer:

Transpiration pull or it is also called the suction force is the force which aids in drawing the water upward from roots to leaves. ...

In leaves, some amount of water is used for photosynthesis and excess water is released into atmosphere through openings called as stomata this is known as transpiration.

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Answer 2

Answer:

Definition of Transpiration:

Transpiration is the biological process of removal of excess water from the aerial parts of the plants.

Another definition:

Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers.

Transpiration pull:

• Transpiration pull develops a negative pressure or tension in xylem sap which is transmitted down to the root.
• The moist walls of mesophyll cells in leaf lose water vapour through stomata and cuticular transpiration.
• Sufficient quantity of water is transpired through intercellular spaces of the mesophyll cells. This is because the dry air outside the leaf has lower water potential than the moist air of leaf.
• As a result, water diffuses out of stomata and diffusion pressure deficit (DPD) increases. As a result, water is sucked from adjoining mesophyll cells and ultimately from vascular tissue. This tension is transmitted to the roots.
• The molecules of water show cohesion and molecules of water and vessel wall show adhesion.
• Because of cohesive and adhesive forces, water column does not break and is pulled upward by the force called as transpiration pull.

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