NEET Biology Transport In Plants Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

Answer: (a)

The opening and closing of stomata depends on the concentration of solutes in the guard cells (the main component of the solute concentration in guard cells is $K^{+}$). When the concentration of solutes, $K^{+}$ ion guard cells increases, their osmotic pressure increases. In other words, their water potential decreases. As a result of this, they absorb water from their surrounding epidermal cells, and their turgidity increases.