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SolveItNCERT · CBSE · NEET

NCERT Exemplar · Class 10 Science Life Processes

82 questions · 82 still being checked

Multiple Choice Questions 1–10 (part 1 of 9)

  1. Exercise 1

    Which of the following statements about the autotrophs is incorrect?
    (a)
    They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
    (b)
    They store carbohydrates in the form of starch
    (c)
    They convert carbon dioxide and water into carbohydrates in the absence of sunlight
    (d)
    They constitute the first trophic level in food chains

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    NCERT’s answer
    (c)
    (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight — false; photosynthesis is light-dependent, so autotrophs need sunlight to make carbohydrates.

  2. Exercise 2

    In which of the following groups of organisms, food material is broken down outside the body and absorbed?
    (a)
    Mushroom, green plants, Amoeba
    (b)
    Yeast, mushroom, bread mould
    (c)
    Paramecium, Amoeba, Cuscuta
    (d)
    Cuscuta, lice, tapeworm

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    NCERT’s answer
    (b)
    (b) Yeast, mushroom, bread mould — these fungi are saprophytes: they secrete enzymes onto organic matter, digest it externally, then absorb the simpler products.

  3. Exercise 3

    Select the correct statement
    (a)
    Heterotrophs do not synthesise their own food
    (b)
    Heterotrophs utilise solar energy for photosynthesis
    (c)
    Heterotrophs synthesise their own food
    (d)
    Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

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    NCERT’s answer
    (a)
    (a) Heterotrophs do not synthesise their own food — they depend on autotrophs or other organisms for organic nutrients, unlike photosynthetic plants.

  4. Exercise 4

    Which is the correct sequence of parts in human alimentary canal?
    (a)
    Mouth → stomach → small intestine → oesophagus → large intestine
    (b)
    Mouth →oesophagus → stomach → large intestine → small intestine
    (c)
    Mouth → stomach → oesophagus → small intestine → large intestine
    (d)
    Mouth → oesophagus → stomach → small intestine → large intestine

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    NCERT’s answer
    (d)
    (d) Mouth → oesophagus → stomach → small intestine → large intestine — swallowed food passes via the oesophagus to the stomach, then through the intestines in this order.

  5. Exercise 5

    If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
    (a)
    Proteins breaking down into amino acids
    (b)
    Starch breaking down into sugars
    (c)
    Fats breaking down into fatty acids and glycerol
    (d)
    Absorption of vitamins

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    NCERT’s answer
    (b)
    (b) Starch breaking down into sugars — salivary amylase hydrolyses starch to maltose in the mouth; without it this step fails, while protein and fat digestion are unaffected there.

  6. Exercise 6

    The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
    (a)
    Pepsin
    (b)
    Mucus
    (c)
    Salivary amylase
    (d)
    Bile

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    NCERT’s answer
    (b)
    (b) Mucus — a thick mucus layer coats the stomach's inner wall and shields it from the corrosive \(\displaystyle \mathrm{HCl}\) secreted by the gastric glands.

  7. Exercise 7

    Which part of alimentary canal receives bile from the liver?
    (a)
    Stomach
    (b)
    Small intestine
    (c)
    Large intestine
    (d)
    Oesophagus

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    NCERT’s answer
    (b)
    (b) Small intestine — bile released via the bile duct enters the duodenum, where it emulsifies fats so lipase can act on them efficiently.

  8. Exercise 8

    A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
    (a)
    complex proteins
    (b)
    simple proteins
    (c)
    fats
    (d)
    starch

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    NCERT’s answer
    (d)
    (d) Starch. \[\text{Starch} + I_2 \xrightarrow{} \text{starch–iodine complex (blue-black)} \] The blue-black colour with iodine is a specific test for starch, which rice water contains in abundance.

  9. Exercise 9

    In which part of the alimentary canal food is finally digested?
    (a)
    Stomach
    (b)
    Mouth cavity
    (c)
    Large intestine
    (d)
    Small intestine

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    NCERT’s answer
    (d)
    (d) Small intestine. Pancreatic and intestinal juices complete digestion of carbohydrates, proteins and fats here into absorbable end products, which the villi then absorb into the blood.

  10. Exercise 10

    Choose the function of the pancreatic juice from the following
    (a)
    trypsin digests proteins and lipase carbohydrates
    (b)
    trypsin digests emulsified fats and lipase proteins
    (c)
    trypsin and lipase digest fats
    (d)
    trypsin digests proteins and lipase emulsified fats

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    NCERT’s answer
    (d)
    (d) Trypsin digests proteins; lipase digests emulsified fats. Bile first emulsifies fat into small droplets, and pancreatic juice's two enzymes then act on protein and fat respectively in the small intestine.