Question

Does the accumulation of solutes inside gaurd cells to open stomata require energy consumption (ATP)? Does the closure of stomata require ATP? Does this movement of water from roots to leaves require plant energy consumption? Explain and Compare.

Answer 1

A. Yes , ATP is required for the opening of the stomata, the malic acid whic is formed in the guard cells breaks down into the malate ion and H⁺ now this proton is pumped out and it is pumped out with help of aATP requirement, which will result in the influx of potassium ions. so here ATP is required.

Closing of stomata does not require ATP.

The transfer water from the root to the leaf is also a passive process which does not require energy in the form of ATP

The initial force is the root pressure which makes a slight water coloumn rise up .This root pressure is sufficient in less distance transport but in large distance transport cohesion , tension and transpirational pull play a role in taking the water up against gravity which is called acent of sap. It does not require ATP.