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NCERT Exemplar · Class 9 Science The Fundamental Unit of Life

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Multiple Choice Questions 11–20 (part 2 of 6)

  1. Exercise 11

    Which cell organelle plays a crucial role in detoxifying many poisons and
    drugs in a cell?
    (a)
    Golgi apparatus
    (b)
    Lysosomes
    (c)
    Smooth endoplasmic reticulum
    (d)
    Vacuoles

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    NCERT’s answer
    (c)
    (c) Smooth endoplasmic reticulum.SER detoxifies drugs and poisons, which is why liver cells, the body's detoxifying tissue, are rich in it. Golgi packages materials, lysosomes digest debris, and vacuoles store; none of these detoxifies.

  2. Exercise 12

    The proteins and lipids, essential for building the cell membrane, are
    manufactured by
    (a)
    rough endoplasmic reticulum
    (b)
    golgi apparatus
    (c)
    plasma membrane
    (d)
    mitochondria

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    NCERT’s answer
    (a)
    (a) Rough endoplasmic reticulum.Its ribosomes make the membrane proteins, and the adjoining smooth ER the membrane lipids, together building new cell membrane. Golgi packages these products; it does not manufacture them.

  3. Exercise 13

    The undefined nuclear region of prokaryotes are also known as
    (a)
    nucleus
    (b)
    nucleolus
    (c)
    nucleic acid
    (d)
    nucleoid

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    NCERT’s answer
    (d)
    (d) Nucleoid — the poorly defined, membrane-less region of a prokaryotic cell holding its naked DNA; unlike a true nucleus it has no nuclear envelope.

  4. Exercise 14

    The cell organelle involved in forming complex sugars from simple sugars are
    (a)
    endoplasmic reticulum
    (b)
    ribosomes
    (c)
    plastids
    (d)
    golgi apparatus

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    NCERT’s answer
    (d)
    (d) Golgi apparatus — it packages material arriving from the endoplasmic reticulum into vesicles and converts simple sugars into complex ones before storage or secretion.

  5. Exercise 15

    Which out of the following is not a function of vacuole?
    (a)
    Storage
    (b)
    Providing turgidity and rigidity to the cell
    (c)
    Waste excretion
    (d)
    Locomotion

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    (d)
    (d) Locomotion — vacuoles handle storage, turgidity and waste excretion (the contractile vacuole in Amoeba); movement is carried out by pseudopodia, cilia or flagella, not a vacuole.

  6. Exercise 16

    Amoeba acquires its food through a process, termed
    (a)
    exocytosis
    (b)
    endocytosis
    (c)
    plasmolysis
    (d)
    exocytosis and endocytosis both

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    NCERT’s answer
    (b)
    (b) Endocytosis — pseudopodia flow around a food particle and pinch inward, enclosing it in a food vacuole for digestion.

  7. Exercise 17

    Cell wall of which one of these is not made up of cellulose?
    (a)
    Bacteria
    (b)
    Hydrilla
    (c)
    Mango tree
    (d)
    Cactus

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    NCERT’s answer
    (a)
    (a) Bacteria — its cell wall is made of peptidoglycan; Hydrilla, mango tree and cactus are all plants, whose cell walls are cellulose.

  8. Exercise 18

    Silver nitrate solution is used to study
    (a)
    endoplasmic reticulum
    (b)
    golgi apparatus
    (c)
    nucleus
    (d)
    mitochondria

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    NCERT’s answer
    (b)
    (b) Golgi apparatus — silver nitrate stains it dark, which is how Camillo Golgi first saw it in nerve cells.Answer: (b) Golgi apparatus.

  9. Exercise 19

    Organelle other than nucleus, containing DNA is
    (a)
    endoplasmic reticulum
    (b)
    golgi apparatus
    (c)
    mitochondria
    (d)
    lysosome

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    NCERT’s answer
    (c)
    (c) Mitochondria — it carries its own circular DNA and ribosomes, letting it divide independently of the nucleus; the ER, golgi apparatus and lysosome carry none.

  10. Exercise 20

    Kitchen of the cell is
    (a)
    mitochondria
    (b)
    endoplasmic reticulum
    (c)
    chloroplast
    (d)
    golgi apparatus

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    NCERT’s answer
    (c)
    (c) Chloroplast — it traps light energy to manufacture food by photosynthesis, earning it the name kitchen of the cell.