BotanyWhich of the following statements is not true for stomatal apparatus?

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

  1. A

    Guard cells possess chloroplasts and mitochondria.

  2. B

    Guard cells are surrounded by lenticels.

  3. C

    Stomata are involved in gaseous exchange.

  4. D

    Inner walls of guard cells are thick.

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    Solution:

    The epidermal surface of the leaf exhibits 1,000 to 60,000 minute openings called stomata. The stomata are bordered by two specialised epidermal cells - the guard cells which in some cases are accompanied by subsidiary cells. The walls of guard cells are unevenly thickened. Each guard cell has thick, inelastic inner wall and thin, elastic outer wall. Stomatal aperture is present in between the guard cells. Guard cells are surrounded by accessory cells or subsidiary cells.

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