Question

Which of the following statement(s) is (are) true about stomata?

I.

These are the tiny pores present on the surface of the leaves.

II.

Through these, massive amounts of gaseous exchange take place.

III.

Plants open these pores when carbon dioxide is not required for

photosynthesis.

IV.

Guard cells operate the opening and closing of these pores.

(a) I and II only

(b) I and III only

(c) I, II and III only

(d) I, II and IV only​

Answer 1

Answer:

Stomata are the pores present on the surface of the leaves through which the exchange of gases takes place. Stomata also help in transpiration, in which the loss of water from the surface of leaves in the form of water vapour.

Explanation:

any of the minute pores in the epidermis of the leaf or stem of a plant, forming a slit of variable width which allows movement of gases in and out of the intercellular space

| AND || IS THE RIGHT ANSWER

Answer 2

 Statement I and II are true statement.

Explanation:

• stomata:
• These are the tiny pores present on the surface of the leaves.
• Through these, massive amounts of gaseous exchange take place.
• Its primary purpose is to exchange gases between the leaf by releasing and closing pores.
• It aids in the removal of moisture from the leaves.
• Plants open these pores when carbon dioxide is not required for  photosynthesis is incorrect statement.
• During photosynthesis, carbon dioxide is absorbed in and oxygen is released.
• Guard cells operate the opening and closing of these pores:
• The guard cells control how increase number open and close.
• Because of the curved surface, as water comes into the cell walls, they enlarge, causing the pores to widen.
• The pores shut when the sertoli cells absorb moisture and contract, turning flaccid and upright.