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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • Sunken stomata are found in

    Question: Sunken stomata are found in

    Options:

    hydrophytes
    xerophytes
    mesophytes
    None of the above/More than one of the above

    The correct answer is xerophytes.

    🔑Key Points:
    -Xerophytes are plants found in the desert area.
    -They require the least amount of water. In deserts there is a scarcity of water thus the plants have to take their water from the underground water level.
    -Their stomata are of sunken type (deep-seated) like cup – shape depression as it helps them to prevent the loss of water through transpiration.
    -Examples of xerophytes are – Aloe vera, Pineapple, Cactus, etc.
    -The stomata are minute pores that occur in the epidermis of the plants.
    -Each stoma remains surrounded by two kidneys or bean-shaped epidermal cells the guard cells.
    – The stomata may occur on any part of a plant except the roots.
    -The epidermal cells bordering the guard cells are called accessory cells or subsidiary cells.
    -The number and types of stomata vary in different plant species based on their Habitat.

    🔴Additional Information:
    -Hydrophytes are plants that are either partially or fully submerged into water.
    -Partially submerged hydrophytes like Lilly have stomata present on their upper leaf surface (lower pat is submerged in water).
    -Fully submerged hydrophytes like water ferns do not have stomata, instead of stomata, the plant's surface cells are capable of absorbing water, nutrients, and dissolved gases in the water.
    -Mesophytes have generally stomata present on the lower surface of the epidermis
    -Examples are corn(maize), clover, cucurbit, etc
    -Parasite: The organism that lives on or inside other living organisms, to derive their food are called parasites. Amarbel (Cuscuta) is a ''parasite''.

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