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प्रश्न
Mark the most appropriate answer in the following:
Stomata open during day and close at night because:
पर्याय
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
उत्तर
Enzymes convert starch into sugar at elevated pH in night
APPEARS IN
संबंधित प्रश्न
Choose the correct answer:
Stomata open during day time because guard cells
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?
Where are stomata generally found?
Given below is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the questions that follow:
(i) What is the colour of dry cobalt chloride paper?
(ii) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
(iii) Why axe glass slides placed over the dry cobalt chloride papers?
(iv) 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.
(v) Define the term ‘transpiration’.
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?
Complete the following sentence with appropriate word:
95% of the total transpiration takes place through ________.
State the Location:
Guard cells
Write the functional activity of the following structure:
Stomata
Write a short note on lenticular transpiration.
Give a reason/suitable explanation.
Leaves of some plants wilt during midday and recover in the evening.
