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NCERT Exemplar · Class 9 Science Diversity in Living Organisms

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Multiple Choice Questions 1–10 (part 1 of 7)

  1. Exercise 1

    Find out incorrect sentence
    (a)
    Protista includes unicellular eukaryotic organisms
    (b)
    Whittaker considered cell structure, mode and source of nutrition for
    classifying the organisms in five kingdoms
    (c)
    Both Monera and Protista may be autotrophic and heterotrophic
    (d)
    Monerans have well defined nucleus

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    NCERT’s answer
    (d)
    (d) Monerans have no well-defined nucleus — they are prokaryotes, so their genetic material lies free in the cytoplasm, unlike Protista, which is eukaryotic.

  2. Exercise 2

    Which among the following has specialised tissue for conduction of water?
    (i)
    Thallophyta
    (ii)
    Bryophyta
    (iii)
    Pteridophyta
    (iv)
    Gymnosperms
    (i)
    and (ii)
    (ii)
    and (iii)
    (iii)
    and (iv)
    (i)
    and (iv)

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    NCERT’s answer
    (c)
    (c) (iii) and (iv). Pteridophytes and gymnosperms carry xylem and phloem for water conduction; thallophytes and bryophytes have no vascular tissue.

  3. Exercise 3

    Which among the following produce seeds?
    (a)
    Thallophyta
    (b)
    Bryophyta
    (c)
    Pteridophyta
    (d)
    Gymnosperms

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    NCERT’s answer
    (d)
    (d) Gymnosperms. They bear naked seeds on cones; thallophytes, bryophytes and pteridophytes reproduce by spores, not seeds.

  4. Exercise 4

    Which one is a true fish?
    (a)
    Jellyfish
    (b)
    Starfish
    (c)
    Dogfish
    (d)
    Silverfish

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    NCERT’s answer
    (c)
    (c) Dogfish, a cartilaginous fish (Pisces). Jellyfish, starfish and silverfish share the name only by resemblance; they belong to Coelenterata, Echinodermata and Insecta.

  5. Exercise 5

    Which among the following is exclusively marine?
    (a)
    Porifera
    (b)
    Echinodermata
    (c)
    Mollusca
    (d)
    Pisces

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    NCERT’s answer
    (b)
    (b) Echinodermata. Every echinoderm — starfish, sea urchin, sea cucumber — lives in the sea; Porifera, Mollusca and Pisces all have freshwater members too.

  6. Exercise 6

    Which among the following have open circulatory system?
    (i)
    Arthropoda
    (ii)
    Mollusca
    (iii)
    Annelida
    (iv)
    Coelenterata
    (i)
    and (ii)
    (iii)
    and (iv)
    (i)
    and (iii)
    (ii)
    and (iv)

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    NCERT’s answer
    (a)
    (a) (i) and (ii). Arthropods and molluscs have haemolymph bathing tissues directly in open sinuses; annelids have a closed system, coelenterates have none.

  7. Exercise 7

    In which group of animals, coelom is filled with blood?
    (a)
    Arthropoda
    (b)
    Annelida
    (c)
    Nematoda
    (d)
    Echinodermata

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    NCERT’s answer
    (a)
    (a) Arthropoda. Their true coelom is reduced, and the main body cavity, the haemocoel, is filled with blood (haemolymph) instead of coelomic fluid.

  8. Exercise 8

    Elephantiasis is caused by
    (a)
    Wuchereria
    (b)
    Pinworm
    (c)
    Planarians
    (d)
    Liver flukes

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    NCERT’s answer
    (a)
    (a) Wuchereria, a filarial worm that blocks lymph vessels, causing the swelling of limbs known as elephantiasis (filariasis).

  9. Exercise 9

    Which one is the most striking or (common) character of the vertebrates?
    (a)
    Presence of notochord
    (b)
    Presence of triploblastic condition
    (c)
    Presence of gill pouches
    (d)
    Presence of coelom

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    NCERT’s answer
    (a)
    (a) Presence of notochord. Vertebrates are chordates, so every vertebrate carries a notochord, at least as an embryo; triploblasty and a coelom also occur in non-chordate phyla.

  10. Exercise 10

    Which among the following have scales?
    (i)
    Amphibians
    (ii)
    Pisces
    (iii)
    Reptiles
    (iv)
    Mammals
    (i)
    and (iii)
    (iii)
    and (iv)
    (ii)
    and (iii)
    (i)
    and (ii)

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    NCERT’s answer
    (c)
    (c) (ii) and (iii). Pisces and reptiles carry scales; amphibian skin stays moist and scale-free, and mammals are covered mainly in hair.