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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
What causes the opening and closing of guard cells of stomata during transpiration?
Under what conditions do plant transpire most slowly?
State whether the following statement is true or false. Rewrite the false statement correctly.
Transpiration cools the plant when it is hot outside.
Define the three processes by which plants 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.
Give suitable explanation for the following:
Perspiration and transpiration help to cool the body temperature of the organism.
Give suitable explanation for the following:
On a bright sunny day, the leaves of certain plants roll up.
The diagram given alongside is an apparatus used to study a particular phenomenon in plants.
(i) Name the apparatus.
(ii) What is it used for?
(iii) What is the role played by the air bubble in this experiment?
(iv) Of what use is the reservoir?
Comment on the following statement:
A well-watered potted plant shows wilting of leaves on a hot sunny day.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
What is the purpose of putting oil in the test tube?
Design an experiment to demonstrate the transpiration process.
Define the following term:
Transpiration
Plants lose water by the process of transpiration.
What causes the opening and closing of guard cells of stomata during transpiration?
Guard cells are responsible for the opening and closing of stomata.
Give the importance of transpiration?
Complete the following by choosing the proper option.
Stomata : Transpiration :: Hydathode : ____________.
Boojho’s uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.
When does it become necessary to take such a treatment?
Boojho wanted to test the presence of starch in leaves. He performed the following steps.
- He took a leaf and boiled it in water.
- He placed the leaf in a petri dish and poured some iodine over it.
He did not get the expected result. Which step did he miss? Explain.
Identify the wrong statement and correct it.
Leaves perform the function of transpiration only.
Transpiration takes place through ______.
Entry of water into root hair is the demonstration of which of the following process?
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
ABA (Abscisic acid) is called a stress hormone. How does this hormone overcome stress conditions?
Water molecule is very polar. Polar end of molecule attracts opposite charges on another water molecule (acts like magnet). How will you explain this property of water with reference to upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.
Name the structures through which Transpiration occur in a plant.
The process of evaporative loss of water from the aerial parts of a plant is ______.
Which of the following is an external factor affecting the rate of transpiration?
