Q) The entry of water from subsidiary cells into guard cells is effected by
a. auxin
b. K+
c. Cl-
d. ABA
Answers
Answer:
The turgor pressure of guard cells is controlled by movements of large quantities of ions and sugars into and out of the guard cells. When guard cells take up these solutes, the water potential inside the cells decreases, causing osmotic water flow into the guard cells.
Answer:
b. K+
Explanation:
The correct option is b.
Increased thickening of inner wall of guard cellsDuring opening of stomata, accumulation of K+ ions in guard cells occurs. Due to this, there is creation of water potential gradient between guard cell and subsidiary cells. Water moves inside the guard cells and increases the turgor pressure of guard cells. When turgidity increases within the two guard cells flanking each stomatal aperture or pore, the thin outer walls bulge out and force the inner walls into a crescent shape making pores between the guard cells. But there is no increased thickening of inner wall of guard cells. Guard cells are particular types of plant cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a space between them that make up a stomatal pore. The stomatal pores are largest when water is freely available to them and by this guard cells become turgid, and closed when water availability is seriously low and then guard cells become flaccid. Stomata are tiny or small openings in plant tissue that helps in the exchange of gases. Stomata are normally found in the leaves of plants but sometimes in the stem of plants also. Guard cells surround the stomata and they regulate the opening and closing of stomatal pores. Opening and closure of the stomatal pore are mediated by two guard cells by maintaining the turgor pressure between them.
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