Advertisements
Advertisements
Question
ABA (Abscisic acid) is called a stress hormone. How does this hormone overcome stress conditions?
Advertisements
Solution
Abscisic acid is a stress hormone and during stress conditions, it induces changes like the closing of stomata to prevent further water loss during the scarcity of water, aids in seed germination when conditions are favourable and dormancy when not and other changes as and when required.
APPEARS IN
RELATED QUESTIONS
Under what conditions do plant transpire most slowly?
Briefly explain, how transpiration helps in upward conduction of water in plants?
State whether the following statement is true or false. Rewrite the false statement correctly.
Transpiration is the loss of water from the roots of the plant.
State whether the following statement is true or false. Rewrite the false statement correctly.
Transpiration cools the plant when it is hot outside.
Name the process by which water loss takes place through the leaves.
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
Litmus paper is used to demonstrate transpiration from the leaves of the green plant.
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?
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?
What are stomata? What governs the opening and closing of stomata?
Design an experiment to demonstrate the transpiration process.
Give Technical Term
When cobalt chloride paper is placed on lower and upper surface of the leaf, the paper of which side becomes more pink?
Stomata of a plant open due to ______.
What causes the opening and closing of guard cells of stomata during transpiration?
Transpiration takes place through ______.
Entry of water into root hair is the demonstration of which of the following process?
Observe the following diagram and identify the process and its significance from the following options:
(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.
Transpiration helps to cool the body of the plant.
