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NCERT Exemplar · Class 9 Science Tissues

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Multiple Choice Questions 21–33 (part 3 of 6)

  1. Exercise 21

    Which of the following cells is found in the cartilaginous tissue of the body?
    (a)
    Mast cells
    (b)
    Basophils
    (c)
    Osteocytes
    (d)
    Chondrocytes

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    (d)
    (d) Chondrocytes.These cells sit in small cavities called lacunae inside the solid cartilage matrix (chondrin); mast cells, basophils and osteocytes belong to connective, blood and bone tissue respectively.Answer: (d) Chondrocytes

  2. Exercise 22

    The dead element present in the phloem is
    (a)
    companion cells
    (b)
    phloem fibres
    (c)
    phloem parenchyma
    (d)
    sieve tubes

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    (b)
    (b) Phloem fibres.Sieve tubes, companion cells and phloem parenchyma stay living and conduct food; only the thick-walled, lignified phloem fibres die and act purely as mechanical support.Answer: (b) Phloem fibres

  3. Exercise 23

    Which of the following does not lose their nucleus at maturity?
    (a)
    Companion cells
    (b)
    Red blood cells
    (c)
    Vessel
    (d)
    Sieve tube cells

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    (a)
    (a) Companion cells.A companion cell keeps its nucleus to service the adjoining sieve tube; sieve tube cells, mature xylem vessels and mammalian red blood cells all lose their nucleus at maturity.

  4. Exercise 24

    In desert plants, rate of water loss gets reduced due to the presence of
    (a)
    cuticle
    (b)
    stomata
    (c)
    lignin
    (d)
    suberin

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    (a)
    (a) Cuticle.\[\text{thick waxy cuticle} \Rightarrow \text{water loss through epidermis} \downarrow \]Stomata, if open, would raise water loss instead, and lignin/suberin do not coat the epidermis this way.Answer: (a) Cuticle

  5. Exercise 25

    A long tree has several branches. The tissue that helps in the side ways
    conduction of water in the branches is
    (a)
    collenchyma
    (b)
    xylem parenchyma
    (c)
    parenchyma
    (d)
    xylem vessels

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    (d)
    (d) Xylem vessels run as continuous tubes from the trunk into each branch; at the junction, water passes sideways from the trunk's vessels into the branch's vessels, then rises within the branch.Answer: (d) xylem vessels.

  6. Exercise 26

    If the tip of sugarcane plant is removed from the field, even then it keeps on
    growing in length. It is due to the presence of
    (a)
    cambium
    (b)
    apical meristem
    (c)
    lateral meristem
    (d)
    intercalary meristem

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    (d)
    (d) Intercalary meristem lies at the base of internodes and leaves in grasses like sugarcane; it keeps dividing and adds length even after the apical tip is cut off.

  7. Exercise 27

    A nail is inserted in the trunk of a tree at a height of 1\displaystyle 1 metre from the
    ground level. After 3\displaystyle 3 years the nail will
    (a)
    move downwards
    (b)
    move upwards
    (c)
    remain at the same position
    (d)
    move sideways

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    (c)
    (c) A tree lengthens only at its apical meristem near the tip; the mature trunk below does not elongate, so a nail driven into it keeps the same height.

  8. Exercise 28

    Parenchyma cells are
    (a)
    relatively unspecialised and thin walled
    (b)
    thick walled and specialised
    (c)
    lignified
    (d)
    none of these

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    (a)
    (a) Parenchyma cells are living, thin-walled and unspecialised; they are neither lignified nor thick-walled and specialised like sclerenchyma.

  9. Exercise 29

    Flexibility in plants is due to
    (a)
    collenchyma
    (b)
    sclerenchyma
    (c)
    parenchyma
    (d)
    chlorenchyma

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    (a)
    (a) Collenchyma cells have unevenly thickened, flexible walls and pack tightly with little space between them, giving young stems and leaf stalks mechanical strength yet letting them bend.

  10. Exercise 30

    Cork cells are made impervious to water and gases by the presence of
    (a)
    cellulose
    (b)
    lipids
    (c)
    suberin
    (d)
    lignin

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    (c)
    (c) Suberin, deposited in the walls of cork cells, is waterproof and airtight, so it seals off dead cork tissue from loss of water and exchange of gases.

  11. Exercise 31

    Survival of plants in terrestrial environment has been made possible by
    the presence of
    (a)
    intercalary meristem
    (b)
    conducting tissue
    (c)
    apical meristem
    (d)
    parenchymatous tissue

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    (b)
    (b) Conducting tissue -- xylem and phloem -- moves water, minerals and food against gravity through tall stems, letting plants grow upright and survive away from a constant water source on land.

  12. Exercise 32

    Choose the wrong statement
    (a)
    The nature of matrix differs according to the function of the tissue
    (b)
    Fats are stored below the skin and in between the internal organs
    (c)
    Epithelial tissues have intercellular spaces between them
    (d)
    Cells of striated muscles are multinucleate and unbranched

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    (c)
    (c) Epithelial cells are packed tightly with no intercellular spaces, forming a continuous sheet that covers and protects; the other three statements about matrix, fat storage and striated muscle are correct.

  13. Exercise 33

    The water conducting tissue generally present in gymnosperm is
    (a)
    vessels
    (b)
    sieve tube
    (c)
    tracheids
    (d)
    xylem fibres

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    (c)
    (c) Gymnosperms lack vessels; their xylem conducts water through tracheids, elongated dead cells with tapering ends and pitted walls, a more primitive arrangement than angiosperm vessels.