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Question
Give a reason/suitable explanation.
Leaves of some plants wilt during midday and recover in the evening.
Solution
During midday, the high rate of transpiration causes certain plant foliage to wilt. The absorption of water compensates for the loss of water, which is why they typically recuperate in the evening.
RELATED QUESTIONS
Name the following:
openings on the stem through which transpiration occurs.
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:
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.
State the functions of guard cells.
The figure below represents the vertical section of a leaf:
(i) Name the parts labeled 1 to 5.
(ii) What do the two arrows (dotted and solid) indicate in the day time and at night?
(iii) Could you add one more arrow in the figure? If yes, what for?
(iv) How many leaf veins have been shown in this section?
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?
Suppose you have a rose plant growing in a pot, how will you demonstrate transpiration in it?
The upper layer of mesophyll in a leaf consists of elongated ground tissue called ______.
When guard cells are flaccid, the stoma must be ______.
Name the three kinds of transpiration.
