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Question
Mark the most appropriate answer in the following:
Stomata open during day and close at night because:
Options
Photosynthesis occurs during day time only
Enzymes convert starch into sugar at elevated pH in night
Loss of sugar increases osmotic concentration of the cell sap
Loss of starch in day time raises OP of subsidiary cells
Solution
Enzymes convert starch into sugar at elevated pH in night
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RELATED QUESTIONS
Distinguish between the following:
Stomata and lenticels
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?
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.
Complete the following sentence with appropriate word:
Openings found on the undersurface of the dorsiventral leaf are ___________.
State the Location:
Guard cells
Write the functional activity of the following structure:
Stomata
Give a reason/suitable explanation.
Leaves of some plants wilt during midday and recover in the evening.
