Stomata are holes in the leaf epidermis which are formed by the opening and closing of guard cells.

Stomata are holes in the leaf epidermis which are formed by the opening and closing of guard cells.

• A. True
• B. False
• C. Stomata are located on stems
• D. Guard cells are not involved in stomata

Answer: (A)

Stomata are pores in the leaf epidermis formed by two guard cells that change shape to open or close the pore. When the guard cells take up water and become turgid, they bow apart and the pore opens; when they lose water and become flaccid, the pore closes. This opening and closing regulate gas exchange for photosynthesis and control water loss, responding to light, CO2 levels, and the plant’s water status. Guard cells are the specialized cells responsible for this movement, so describing stomata as holes created by the opening and closing of guard cells is correct.

Stomata are pores in the leaf epidermis formed by two guard cells that change shape to open or close the pore. When the guard cells take up water and become turgid, they bow apart and the pore opens; when they lose water and become flaccid, the pore closes. This opening and closing regulate gas exchange for photosynthesis and control water loss, responding to light, CO2 levels, and the plant’s water status. Guard cells are the specialized cells responsible for this movement, so describing stomata as holes created by the opening and closing of guard cells is correct.