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Question
When guard cells are flaccid, the stoma must be ______.
Options
Open
Neither open nor closed
Closed
None of these
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Solution
When guard cells are flaccid, the stoma must be closed.
Explanation:
A flaccid guard cell closes the stomata by relaxing its inner membrane. Likewise, the inner wall pulls outward to open the stomata when the guard cells become turgid.
RELATED QUESTIONS
Name the following:
Any two parts of a leaf which allow transpiration.
The apparatus shown in the following diagram is Garreau’s potometer 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 few hours, CaCl2 vials were taken out and weighed again.
What is the purpose of using a manometer?
Where are stomata generally found?
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?
Given below is an experimental set up to study a particular process:
(i) Name the process being studied.
(ii) Explain the process named in (i) above.
(iii) Why is the pot covered with a plastic sheet?
(iv) Mention one way in which this process is beneficial to the plant.
(v) Suggest a suitable control for this experiment.
Give Technical Term
Opening found on the undersurface of the dorsiventral leaf.
Complete the following sentence with appropriate word:
95% of the total transpiration takes place through ________.
Complete the following sentence with appropriate word:
In Nerium, the stomata are present in _________.
Assertion (A): The loss of excess water from the aerial parts of the plant in the form of water vapor is known as transpiration.
Reason (R): Stomata of the leaf perform transpiration.
