Question

In the morning when th sun rises plants open their stomata by
Pumping h2o out of guard cells
Pumping h2o into guard cells
Pump K+ ions into the guard cell
Pump K+ ion out of guard cells

Answer 1

Answer:

The correct answer is Pumping K⁺ into the guard cells.

Guard cells are the pair of cells which surround the stomata. They regulate the opening and closing of the stomata.

This opening and closing is regulated by various signals such as light, temperature, CO₂ concentration in the leaf etc.

In response to factors such as sunlight, low carbon dioxide concentration in the leaf etc. solutes such as sugars, K⁺, Cl⁻, etc are actively transported or pumped into the guard cells.

This lowers the water potential and thus induces the water influx across the cell membrane. The water inflates the guard cells into the kidney-bean shaped cells and thus opens the stomata.