The opening and closing of the stomatal pore depends upon

The opening and closing of the stomatal pore depends upon

  1. oxygen
  2. temperature
  3. water in guard cells
  4. concentration of CO2 in stomata

Answer

Stomata are the tiny pores present at the leaf surface. Each stomatal pore is surrounded by two guard cells that assist in stomatal opening driven by turgidity of guard cells. When water flows in guard cells from epidermal cells, guard cells become turgid and stomata are opened. Removal of water from guard cells makes them flaccid and stomata are closed.

The only epidermal cells with unevenly thickened walls and chloroplasts are the guard cells; they are kidney shaped in dicots and dumbell shaped in monocots.

The correct option is C.