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  • ICAR and TNAU E-Course Summarized

    Summarized Notes
  • Which part of the root absorbs water and minerals?

    Question: Which part of the root absorbs water and minerals?

    Options:

    (a) Root cap
    (b) Root hairs
    (c) Epidermis
    (d) Endodermis

    ✅ Explanation: Root hairs are thin, hair-like extensions of epidermal cells in the root. They significantly increase the surface area of the root, allowing for greater absorption of water and minerals from the soil.

    📌 Other Options Explanations:
    Root cap:Protects the root tip as it grows through the soil.
    Epidermis:The outer layer of the root, but its primary function is protection.
    Endodermis:An inner layer of the root that regulates the movement of substances into the vascular system.

    🔑Key Points :
    -Roots are underground structures.
    -It helps in water transport.
    -The plant absorbs water and minerals from the soil through root hairs and transports them through Xylem.
    -Xylem conducts water and minerals to stem and leaves.
    -Xylem consists of tracheids, fibres, parenchyma and vessels.
    -Only the parenchyma cell is living and stores food and tannins.
    -Vessels, tracheids and fibres are dead and help in the conduction of water.

    • 🛑Additional Information:

    • Pith:
    -It is a vascular tissue found in the stem and roots.
    -It is present in the centre.
    -It is formed of parenchymatous cells.
    -It helps in the storage of food.

    • Cortex:
    -It is ground tissue.
    -It is present in the epidermis and vascular bundles.
    -It is made of parenchymatous cells.
    -It helps in providing support to the plant.

    • Phloem:
    -It is a vascular tissue.
    -It consists of sieve tubes, parenchyma, fibres and companion cell.
    -Only fibres are dead.
    -Sieve tubes, parenchyma and companion cells are living cells.
    -It helps in the transport of sucrose.

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