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NCERT Exemplar · Class 10 Science How do Organisms Reproduce?

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Multiple Choice Questions 1–10 (part 1 of 6)

  1. Exercise 1

    In the list of organisms given below, those that reproduce by the asexual method are
    (i)
    banana
    (ii)
    dog
    (iii)
    yeast
    (iv)
    Amoeba
    (a) (ii) and (iv)
    (b) (i), (iii) and (iv)
    (c) (i) and (iv)
    (d) (ii), (iii) and (iv)

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    NCERT’s answer
    (b)
    (b) (i), (iii) and (iv). Banana propagates vegetatively, yeast buds, and Amoeba undergoes binary fission — all single-parent, asexual routes; a dog reproduces sexually, needing two parents and gametes.

  2. Exercise 2

    In a flower, the parts that produce male and female gametes (germ cells) are
    (a)
    stamen and anther
    (b)
    filament and stigma
    (c)
    anther and ovary
    (d)
    stamen and style

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    NCERT’s answer
    (c)
    (c) anther and ovary. The anther produces pollen grains, which carry the male gametes; the ovary holds the ovules, whose egg cell is the female gamete.

  3. Exercise 3

    Which of the following is the correct sequence of events of sexual reproduction in a flower?
    (a)
    pollination, fertilisation, seedling, embryo
    (b)
    seedling, embryo, fertilisation, pollination
    (c)
    pollination, fertilisation, embryo, seedling
    (d)
    embryo, seedling, pollination, fertilisation

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    NCERT’s answer
    (c)
    (c) pollination, fertilisation, embryo, seedling. Pollen must reach the stigma before fertilisation can form the zygote; the zygote then develops into an embryo, which germinates into a seedling.

  4. Exercise 4

    Offspring formed by asexual method of reproduction have greater similarity among themselves because
    (i)
    asexual reproduction involves only one parent
    (ii)
    asexual reproduction does not involve gametes
    (iii)
    asexual reproduction occurs before sexual reproduction
    (iv)
    asexual reproduction occurs after sexual reproduction
    (a) (i) and (ii)
    (b) (i) and (iii)
    (c) (ii) and (iv)
    (d) (iii) and (iv)

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    NCERT’s answer
    (a)
    (a) (i) and (ii). A single parent's cell divides directly, with no gamete formation or fusion, so no new gene combination arises — offspring stay genetic copies of that one parent.

  5. Exercise 5

    Characters transmitted from parents to offspring are present in
    (a)
    cytoplasm
    (b)
    ribosome
    (c)
    golgi bodies
    (d)
    genes

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    NCERT’s answer
    (d)
    (d) genes. Genes, carried on chromosomes in the nucleus, hold the hereditary instructions that are copied into each offspring during reproduction.

  6. Exercise 6

    Characters that are transmitted from parents to offspring during reproduction show
    (a)
    only similarities with parents
    (b)
    only variations with parents
    (c)
    both similarities and variations with parents
    (d)
    neither similarities nor variations

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    NCERT’s answer
    (c)
    (c) both similarities and variations. DNA copying during reproduction is faithful but not perfect, so offspring resemble parents overall while small copying differences introduce variation.

  7. Exercise 7

    A feature of reproduction that is common to Amoeba, Spirogyra and Yeast is that
    (a)
    they reproduce asexually
    (b)
    they are all unicellular
    (c)
    they reproduce only sexually
    (d)
    they are all multicellular

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    NCERT’s answer
    (a)
    (a) they reproduce asexually. Amoeba undergoes binary fission, Spirogyra fragments, and yeast buds — three asexual routes. Spirogyra is filamentous and multicellular, so "unicellular" is not the shared feature.

  8. Exercise 8

    In Spirogyra, asexual reproduction takes place by
    (a)
    breaking up of filaments into smaller bits
    (b)
    division of a cell into two cells
    (c)
    division of a cell into many cells
    (d)
    formation of young cells from older cells.

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    NCERT’s answer
    (a)
    (a) Breaking up of filaments into smaller bits.Spirogyra filaments fragment at weak points; each fragment grows into a new filament — fragmentation needs no gametes.

  9. Exercise 9

    The ability of a cell to divide into several cells during reproduction in Plasmodium is called
    (a)
    budding
    (b)
    reduction division
    (c)
    binary fission
    (d)
    multiple fission

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    NCERT’s answer
    (d)
    (d) Multiple fission.In Plasmodium the nucleus divides repeatedly before the cytoplasm splits, so one cell yields many daughter cells at once, unlike binary fission's single split into two.

  10. Exercise 10

    The correct sequence of reproductive stages seen in flowering plants is
    (a)
    gametes, zygote, embryo, seedling
    (b)
    zygote, gametes, embryo, seedling
    (c)
    seedling, embryo, zygote, gametes
    (d)
    gametes, embryo, zygote, seedling

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    NCERT’s answer
    (a)
    (a) Gametes, zygote, embryo, seedling.Gametes fuse into a zygote, which divides to form an embryo that develops in the seed and germinates into a seedling.