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NCERT Exemplar · Class 9 Science Diversity in Living Organisms

57 questions · 57 still being checked

Multiple Choice Questions 21–30 (part 3 of 7)

  1. Exercise 21

    Who introduced the system of scientific nomenclature of organisms
    (a)
    Robert Whittaker
    (b)
    Carolus Linnaeus
    (c)
    Robert Hooke
    (d)
    Ernst Haeckel

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    NCERT’s answer
    (b)
    (b) Carolus Linnaeus devised the binomial system of scientific nomenclature, giving each species a two-part Latin name.

  2. Exercise 22

    Two chambered heart occurs in
    (a)
    crocodiles
    (b)
    fish
    (c)
    aves
    (d)
    amphibians

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    NCERT’s answer
    (b)
    (b) A fish heart has one atrium and one ventricle, only two chambers, unlike the three- or four-chambered hearts of amphibians, reptiles, birds and mammals.

  3. Exercise 23

    Skeleton is made entirely of cartilage in
    (a)
    Sharks
    (b)
    Tuna
    (c)
    Rohu
    (d)
    None of these

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    (a)
    (a) Sharks belong to class Chondrichthyes, whose endoskeleton is entirely cartilage; Tuna and Rohu are bony fish (Osteichthyes).

  4. Exercise 24

    One of the following is not an Annelid
    (a)
    Nereis
    (b)
    Earthworm
    (c)
    Leech
    (d)
    Urchins

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    (d)
    (d) Nereis, earthworm and leech are segmented worms of phylum Annelida; sea urchins belong to phylum Echinodermata.

  5. Exercise 25

    The book Systema Naturae was written by
    (a)
    Linnaeus
    (b)
    Haeckel
    (c)
    Whittaker
    (d)
    Robert Brown

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    (a)
    (a) Linnaeus. He authored Systema Naturae ($\displaystyle 1735$), the founding work of classification, arranging organisms into a nested rank system by shared characters.

  6. Exercise 26

    Karl Von Linne was involved with which branch of science?
    (a)
    Morphology
    (b)
    Taxonomy
    (c)
    Physiology
    (d)
    Medicine

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    (b)
    (b) Taxonomy. Karl von Linné (Carolus Linnaeus) devised binomial nomenclature and the ranked classification scheme that founded taxonomy, the science of naming and classifying organisms.

  7. Exercise 27

    Real organs are absent in
    (a)
    Mollusca
    (b)
    Coelenterata
    (c)
    Arthropoda
    (d)
    Echinodermata

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    NCERT’s answer
    (b)
    (b) Coelenterata. Their body shows only tissue-level organisation — cells grouped into tissues but not yet into organs, unlike Mollusca, Arthropoda or Echinodermata.

  8. Exercise 28

    Hard calcium carbonate structures are used as skeleton by
    (a)
    Echinodermata
    (b)
    Protochordata
    (c)
    Arthropoda
    (d)
    Nematoda

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    (a)
    (a) Echinodermata. Their endoskeleton is built of calcareous, \(\displaystyle \text{CaCO}_3\), ossicles set in the body wall, giving starfish and sea urchins a rigid, spiny surface.

  9. Exercise 29

    Differentiation in segmental fashion occurs in
    (a)
    Leech
    (b)
    Starfish
    (c)
    Snails
    (d)
    Ascaris

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    (a)
    (a) Leech. Annelids show metameric segmentation — the body repeats as a linear series of similar segments; Starfish, Snails and Ascaris lack this true segmental plan.

  10. Exercise 30

    In taxonomic hierarchy family comes between
    (a)
    Class and Order
    (b)
    Order and Genus
    (c)
    Genus and Species
    (d)
    Division and Class

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    (b)
    (b) Order and Genus. The hierarchy runs Kingdom, Phylum/Division, Class, Order, Family, Genus, Species, so Family sits directly between Order and Genus.