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प्रश्न
ABA (Abscisic acid) is called a stress hormone. From where does this hormone get released in leaves?
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उत्तर
This hormone, abscisic acid gets released in the leaves from the mesophyll cells of the plant.
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संबंधित प्रश्न
What causes the opening and closing of guard cells of stomata during transpiration?
Name the process by which water loss takes place through the leaves.
(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 sunlight.
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
The figure below represents the set-up at the start of certain experiment to demonstrate an activity of plants:
(i) What is the aim of the experiment?
(ii) Why has oil been put in each test tube?
(iii) What will be the observations in the two test-tubes after about 2-3 days?
(iv) Give reasons to explain any change observed as answered in (iii) above.
(v) Why has the test-tube b without the plant, been taken in the experiment?
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.
Name the cell that surrounds the stoma.
What type of transpiration is possible in the xerophyte Opuntia?
During transpiration, there is a loss of ______
Complete the following by choosing the proper option.
Stomata : Transpiration :: Hydathode : ____________.
Why is transpiration called a necessary evil?
Entry of water into root hair is the demonstration of which of the following process?
Excessive transpiration is due to ______.
The lower surface of leaf will have more number of stomata in a ______.
Describe briefly the three physical properties of water which helps in ascent of water in xylem.
Do different species of plants growing in the same area show the same rate of transpiration at a particular time? Justify your answer.
How can plants be grown under limited water supply without compromising on metabolic activities?
A root hair is derived from ______ cell.
