Question

1. Name the Structure shown.
2. Name the parts numbered 1-5 .
3. What is the most apparent difference between A and B in the Structure shown?
4. Describe the mechanism which brings about the change in the structure depicted in A and B

Answer 1

Answer:

1)Its the stomata.

2)1-Chloroplast

2-Gaurd cell

3-nucleus

4-Cell wall

5-Stoma (stomatal opening)

3)In A the stoma is open(exchange of gas) and in b the stomata is closed (no exchange of gas)

4)the guard cells open and closed this is being possible because of osmosis in the cells

Answer 2

Answer:

4.The opening and closing of stomata completely depends on guard cells . During the day time the chloroplast present in the guard cells undergo photosynthesis which leds to the production of ATP . This ATP increases the concentration inside the guard cells and makes the guard cells hypotonic . As a result endo-osmosis takes place . So more water is drawn into the cells and cell become turgid and they move outward to open out the stomatal pore .

Reverse happens at night . Due to decrease in concentration of ATP ,the cell becomes hypertonic and exo-osmosis takes place . The water gradually moves out of the cell and the cell becomes flaccid . Thus the stomatal pore closes .