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प्रश्न
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
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उत्तर
In plants, the ascent of sap involves factors like root pressure, capillary action, adhesion-cohesion and transpiration. The movement of water up to the base of the stem is resulted only by root pressure. Water can raise only a few centimetres by capillary action so it is effective only in herbs. When there is a water column underneath which is to be pulled only then transpiration pull works. Hence, without adhesion-cohesion of water molecules ascent of sap is not possible.
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संबंधित प्रश्न
State whether the following statement is true or false. Rewrite the false statement correctly.
Transpiration cools the plant when it is hot outside.
How does transpiration help the roots absorb water and minerals from the soil?
Name the process by which water loss takes place through the leaves.
Transpiration is the loss of water as water ______ from the ______ parts of the plant.
(a) State whether the following statement are True or False.
(b) Rewrite the false statement in the correct form by changing either the first or the last word only.
Most transpiration occurs at midnight.
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
Litmus paper is used to demonstrate transpiration from the leaves of the green plant.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Name the process being studied.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Explain the process named above in 7.1.
Define the term:
Guttation
Transpiration is a necessary evil in plants. Explain.
Write a note on Transpiration.
How can plants be grown under limited water supply without compromising on metabolic activities?
ABA (Abscisic acid) is called a stress hormone. How does this hormone overcome stress conditions?
Observe the diagram and answer the following;
 (i) |
 (ii) |
- Are these types of guard cells found in monocots or dicots?
- Which of these shows a higher water content (i) or (ii)?
- Which element plays an important role in the opening and closing of stomata?
The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement of the labelled carbon dioxide.
The process of evaporative loss of water from the aerial parts of a plant is ______.
