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प्रश्न
Transpiration is a necessary evil in plants. Explain.
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उत्तर
Transpiration is a necessary evil in plants because it is inevitable but potentially harmful. Loss of water from the plant results in wilting and causes the death of a plant if a condition of drought is experienced. But transpiration is of great significance for the plant.
- Water is conducted, in most tall plants due to transpiration pull.
- Minerals dissolved in water are distributed throughout the plant body by Transpiration Stream.
- Evaporation of water from the cells of leaves has a cooling effect on plants.
- The wet surface of leaf cells allows gaseous exchange.
संबंधित प्रश्न
The loss of water in the form of water vapour through stomata on leaves is known as ___________.
Transpiration is defined as:
Under what conditions do plant transpire most slowly?
The set up shown alongside was kept in sunlight for an hour. It was observed that drops of water appeared on the inside of the polyethylene bag.
- Name the process which is being demonstrated.
- Why was the pot and its soil left uncovered by the polythene bag?
- Why was the pot left in the sunlight?
- Suppose the pot in this experiment was placed inside a dark room instead of placing it in sunlight for some time. What difference will be noticed?
Define the term Transpiration stream
Name the process by which water loss takes place through the leaves.
Why is there a need for a transport system in plants and animals?
(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.
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in dark.
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Would it make a difference if the experimental set-up is kept in bright sunshine?
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions.
Name the process intended for study.
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:
Why was the pot covered with a plastic sheet?
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:
Mention two ways in which this process is beneficial to plants.
Describe an experiment to prove that transpiration occurs more from the undersurface of dorsiventral leaves.
Explain the term:
Transpiration
What type of transpiration is possible in the xerophyte Opuntia?
______ involves evaporative loss of water from aerial parts.
Complete the following by choosing the proper option.
Stomata : Transpiration :: Hydathode : ____________.
Why is transpiration called a necessary evil?
Write a note on Transpiration.
Entry of water into root hair is the demonstration of which of the following process?
The lower surface of leaf will have more number of stomata in a ______.
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
A root hair is derived from ______ cell.
Transpiration occurs:
