Plant Fibres in Pharmacognosy
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Plant Fibres in Pharmacognosy

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Questions and Answers

What is the main component of the cell walls of natural fibers?

  • Middle lamella
  • Cellulose (correct)
  • Cytoplasm
  • Lignin
  • Which process, involving the tips of elongating cells pushing past one another, is facilitated by a modification in the middle lamella?

  • Gliding growth (correct)
  • Cell differentiation
  • Cell division
  • Axial growth
  • Which part of the fiber initial grows rapidly during development in the axial direction?

  • Fiber initial itself (correct)
  • Cytoplasm
  • Cellulose
  • Middle lamella
  • What is a common characteristic of fibers found in higher plants at maturity?

    <p>Lack of nucleus and cytoplasm</p> Signup and view all the answers

    What is the purpose of fibers in the biology of plants?

    <p>Holding tissues together</p> Signup and view all the answers

    Which characteristic distinguishes fibers from other plant cells like sclereids?

    <p>Long and tapered at the end</p> Signup and view all the answers

    What type of fibres are commonly found outside the xylem in plants?

    <p>Cortical fibres</p> Signup and view all the answers

    Which type of fibres are found in the xylem of plants?

    <p>Libriform fibres</p> Signup and view all the answers

    Which of the following is NOT an example of animal fibre?

    <p>Leather</p> Signup and view all the answers

    What is the main component of synthetic fibres?

    <p>Petrochemicals</p> Signup and view all the answers

    Which fibre type is secreted by glands of insects during the preparation of cocoons?

    <p>Silk</p> Signup and view all the answers

    Where are mineral fibres like glass and asbestos derived from?

    <p>Minerals</p> Signup and view all the answers

    Study Notes

    Characteristics of Fibres

    • Fibres are thin, long, and flexible structures that are indigestible by the human body.
    • They are elongated thick-walled cells with pointed ends, consisting of cellulose and may or may not contain lignin.
    • Fibres are developed from a single cell, the fibre initial, which grows rapidly in the axial direction.
    • They are often found in groups or clumps or patches and are often dead at maturity, lacking a nucleus and cytoplasm.

    Properties of Fibres

    • Fibres are long and tapered at the end.
    • They can be as long as 1-8 mm in length.
    • They contain thick secondary walls with fewer pits than sclereids.
    • Fibres have uniformly thickened lignified cell walls in plants.

    Types of Fibres

    • Natural fibres: biodegradable, produced by plants, animals, and geological processes.
    • Vegetable fibres: elongated, needle-like pointed sclerenchyma cells.
    • Intraxylary fibres: found in the xylem, including libriform fibres and fibre tracheids.
    • Extraxylary fibres: found outside the xylem, including cortical fibres, pericyclic fibres, and phloem or bast fibres.
    • Seed fibres: e.g., cotton.
    • Leaf fibres: e.g., sisal.
    • Nut fibres: e.g., coconut.
    • Fruit fibres: e.g., oil palm.
    • Stem or stalk fibres: e.g., rice, flax.

    Animal Fibres

    • Examples include sheep wool, mink, alpaca hair, horse hair, and silk.
    • Avian fiber: from birds' feathers and feather fibers.
    • Goat hair, alpaca hair, horse hair, and angora wool.
    • Tendon or sinew, catgut, and fur.

    Mineral Fibres

    • Glass and asbestos.

    Synthetic Fibres

    • Generally come from synthetic materials such as petrochemicals and natural carbohydrates.
    • Examples include rayon, cellulose wadding, acetate rayon, nylon, and terylene.

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    Description

    Explore the biological origin and structure of plant fibres, including natural and synthetic fibres. Learn about the characteristics of plant fibres such as cotton and their cell wall composition in Pharmacognosy.

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