What causes stomata to open and close?

Options

  • A. Change in turgor pressure of guard cells
  • B. Movement of bones
  • C. Contraction of muscles
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

A. Change in turgor pressure of guard cells

Detailed Explanation

Changes in the turgor pressure of guard cells regulate the opening and closing of stomata. When guard cells gain water and become turgid, the stomatal pore generally opens. When they lose water and become flaccid, the pore closes. Stomata regulate gas exchange and transpiration and are especially important for photosynthesis and plant water balance.