Which of the following statements is not correct for stomatal apparatus?

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Inner walls of guard cells are thick and in elastic.

Guard cells invariably possess chloroplasts and mitochondria.

Guard cells does not possess subsidiary cells.

Stomata are involved in gaseous exchange.

answer is C.

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Detailed Solution

The stomatal aperture, guard cells and the neighbouring (and encircling) cells is called a stomatal complex or stomatal apparatus. Stomata consist of an opening or stomatal pore, and two kidney-shaped guard cells. The guard cells are used for opening and closing the stomatal pore, in order to regulate the evapotranspiration and gas exchange. These guard cells are kidney shaped in dicot and dumb-bell shaped in monocots. The epidermal cells surrounding the guard cells are specialized and are known as subsidiary cells or accessory cells. Stomata are often more common on the lower leaf surfaces.

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