NEET BIOLOGY

Detailed explanation-1: -Potassium ions movement into and out of guard cells is related to the turgidity and consequent opening and closing of stomatal pore.

Detailed explanation-2: -To put it simply, potassium regulates the opening and closing of plant stomata. Stomates are the pores on plant leaves that allow for gas and water vapor exchange. When plants have adequate potassium, the guard cells swell and allow for complete closure of the stoma opening.

Detailed explanation-3: -K+ ions move out of the cell. This causes the stomatal pore to close. This occurs in the absence of light or when rates of photosynthesis are low. In this condition the stomatal pore is closed.

Detailed explanation-4: -(1973), and Raschke and Humble (1973). Up to the present time, K involvement in sto-matal movements has been reported for 28 species of which twenty were reported in 1973 by Will-mer and Pallas.

Detailed explanation-5: -This ion exchange occurs by the expenditure of ATP energy. Increased concentration of K and malate ions in the guard cells vacuole, will cause sufácient osmotic pressure to absorb water from surrounding cells. This in turn will increase turgor pressure of guard cells and lead to the opening of stomatal pores.