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प्रश्न
Define the following term:
Cuticle
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उत्तर
The epidermis secretes a viscous layer on the surfaces of leaves, which is known as the cuticle. Its primary function is to prevent excessive transpiration, thereby reducing water loss from the leaf surfaces.
संबंधित प्रश्न
Given ahead is a diagram of an experimental setup to study the process of transpiration in plants. Study the same and then answer the question that follows:
- Name the colour of dry cobalt chloride paper.
- Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
- Why are glass slides placed over the dry cobalt chloride papers?
- After about half an hour, what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.
Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the question that follow:
Why are glass slides placed over the dry cobalt chloride papers?
What is the advantage of wilting to a plant?
The apparatus shown here is Girreau’s poto-meter designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride (CaCl2) contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After a few hours, CaCl2 vials were taken out and weighed again.
(i) What is the purpose of keeping CaCl2 vials inside the cup?
(ii) After a few hours, the CaCl2 vials were taken out and weighed again. Will you expect any difference in weight? If so, give reasons.
(iii) What was the purpose of using a mano-meter?
(iv) What do you mean by transpiration?
Name the following:
The process of getting rid of excess water in the form of water vapour through the stomata.
Name the following:
A potometer is an instrument for measuring the rate of the most transpiration in a herbaceous plant like Balsam occurs through which part.
Mark the most appropriate answer in the following:
Stomata open during day and close at night because:
Mention the differences between stomatal and lenticular transpiration.
Write a short note on lenticular transpiration.
Maximum transpiration occurs through ______.
