English

Mark the Most Appropriate Answer in the Following: Stomata Open During Day and Close at Night Because: - Biology

Advertisements
Advertisements

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

MCQ
Advertisements

Solution

Enzymes convert starch into sugar at elevated pH in night

shaalaa.com
Kinds of Transpiration
  Is there an error in this question or solution?
Chapter 4: Transpiration - Multiple Choice Questions

APPEARS IN

ICSE Biology [English] Class 10
Chapter 4 Transpiration
Multiple Choice Questions | Q 2

RELATED QUESTIONS

Name the following:

openings on the stem through which transpiration occurs.


Given below is an example of a certain structure and its special functional activity:

Chloroplasts and Photosynthesis

In a similar way, write the functional activity against the following:

Lenticels and ______


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, CaCl vials were taken out and weighed again.

What is the purpose of using a manometer?


Where are stomata generally found?


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.


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?


Give Technical Term
Opening found on the undersurface of the dorsiventral leaf.


Suppose you have a rose plant growing in a pot, how will you demonstrate transpiration in it?


Guard cells help in regulating the ______.


Given below is the figure of a stoma. Study the same and answer the following questions:

  1. Label the guidelines A and B.
  2. Write the exact location of the above-mentioned structures.
  3. Mention one important role of structure A.
  4. Write three important roles for structure B.
  5. Redraw the same figure when structures A are in flaccid condition. When does the flaccid condition occur?

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×