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Digestion MCQs for MDCAT Practice

Biology section, Digestion chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 814 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    It is an enzyme secreted by small intestine:
    • Pepsin
    • Trypsin
    • Chymotrypsin
    • Sucrase (correct answer)
    Correct answer: D
    Distinguishes between enzymes secreted by the stomach and small intestine, focusing on brush border enzymes.
  2. Question 2
    The digestive secretions from different parts of GIT have the ability to kill microbes present in the food. Which of the following best describe this role?
    • Disinfectants
    • Chemotherapeutics
    • Immunosuppressant
    • Antiseptics (correct answer)
    Correct answer: D
    Digestive secretions like stomach acid and lysozyme act as antiseptics, killing ingested microbes to protect the body.
  3. Question 3
    Major metabolic factory, detoxification centre and storage organ of body is :
    • Stomach
    • Brain
    • Kidney
    • Liver (correct answer)
    Correct answer: D
    The liver is the body's primary metabolic hub, detoxification center, and storage organ, crucial for maintaining homeostasis.
  4. Question 4
    What is an example of symbiotic nutrition?
    • Dodder
    • Bacteria that breakdown the proteins of plants and animals
    • Mycorrhiza (correct answer)
    • Puccinia
    Correct answer: C
    Mycorrhizae exemplify symbiotic nutrition where fungi and plant roots mutually benefit, a key concept in plant-fungal interactions.
  5. Question 5
    Dome shaped part of the stomach is:
    • Cardiac region
    • Fundus (correct answer)
    • Corps
    • Pylorus
    Correct answer: B
    The fundus, the dome-shaped upper portion of the stomach, is situated superior to the esophageal opening and is key for gastric distension.
  6. Question 6
    Which one of the following animals has no alimentary canal?
    • Ascaris
    • Pinworm
    • Planaria
    • Tapeworm (correct answer)
    Correct answer: D
    Tapeworms uniquely lack a complete digestive system, absorbing nutrients directly through their body surface, unlike Ascaris, pinworms, and planarians.
  7. Question 7
    The lacteals are central lymph vessels that are found in:
    • Liver
    • Villi (correct answer)
    • Pancrease
    • Spleen
    Correct answer: B
    Lacteals, essential for fat absorption, are specialized lymphatic capillaries found within the villi of the small intestine.
  8. Question 8
    Cells that lower the stomach pH are:
    • Parietal (correct answer)
    • Zymogen
    • Chief
    • None of these
    Correct answer: A
    Parietal cells are key to gastric acid secretion, lowering stomach pH for digestion and pathogen defense.

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Read the full Digestion chapter notes: Digestion notes. Or browse every chapter.