Class 10 Biology



Eemplar Problems MCQ

In which of the following groups of organisms, food material is broken down outside the body and absorbed?

  • Mushroom, green plants, Amoeba
  • Yeast, mushroom, bread mould
  • Paramecium, Amoeba, Cuscuta
  • Cuscuta, lice, tapeworm

    Answer: (b) Yeast, Mushroom, bread mould [These are saprotrophs, and digestion in saprotrophs takes place before ingestion.]

Select the correct statement

  • Heterotrophs do not synthesise their own food
  • Heterotrophs utilise solar energy for photosynthesis
  • Heterotrophs synthesise their own food
  • Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

    Answer: (a) Heterotrophs do not synthesize their own food [Other options show features of autotrophic nutrition.]

Which of the following statements about the autotrophs is incorrect?

  • They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
  • They store carbohydrates in the form of starch
  • They convert carbon dioxide and water into carbohydrates in the absence of sunlight
  • They constitute the first trophic level in food chains

    Answer: (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight

Which is the correct sequence of parts in human alimentary canal?

  • Mouth → stomach → small intestine → oesophagus → large intestine
  • Mouth →oesophagus → stomach → large intestine → small intestine
  • Mouth → stomach → oesophagus → small intestine → large intestine
  • Mouth → oesophagus → stomach → small intestine → large intestine

    Answer: (d) Mouth → oesophagus → stomach → small intestine → large intestine

If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

  • Proteins breaking down into amino acids
  • Starch breaking down into sugars
  • Fats breaking down into fatty acids and glycerol
  • Absorption of vitamins

    Answer: (b) Starch breaking down into sugars [Salivary amylase digests starch. Hence, its absence will hamper digestion of starch.]

The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

  • Pepsin
  • Mucus
  • Salivary amylase
  • Bile

    Answer: (b) Mucus

Which part of alimentary canal receives bile from the liver?

  • Stomach
  • Small intestine
  • Large intestine
  • Oesophagus

    Answer: (b) Small intestine [Bile comes to the small intestine through hepato-pancreatic duct.]

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

  • Complex proteins
  • Simple proteins
  • Fats
  • Starch

    Answer: (d) Starch [Starch makes a dark blue complex with iodine.]

In which part of the alimentary canal food is finally digested?

  • Stomach
  • Mouth cavity
  • Small intestine
  • Large intestine

    Answer: (c) Small intestine [Major part of digestion takes place in small intestine; where digestion is completed.]

Choose the function of the pancreatic juice from the following

  • Trypsin digests proteins and lipase carbohydrates
  • Trypsin digests emulsified fats and lipase proteins
  • Trypsin and lipase digest fats
  • Trypsin digests proteins and lipase emulsified fats

    Answer: (d) Trypsin digests proteins and lipase emulsified fats

When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of

  • Oxygen
  • Carbon dioxide
  • Nitrogen
  • Water vapour

    Answer: (b) Carbon dioxide [Carbon dioxide reacts with limewater to form calcium carbonate. Insoluble calcium carbonate is responsible for appearance of white colour.]



Exemplar MCQ2

Exemplar MCQ3

Exemplar Short Answer 1

Exemplar Short Answer 2

Exemplar Short Answer 3

Exemplar Long Answer

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