Q168 / 180 · AIIMS 2013 · Zoology

Assertion : Duodenum is the main organ of small intestine. Reason : In duodenum, digestion and absorption mainly occurs.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false
  • Correct answer
    D
    If both assertion and reason are false

Solution

Principal organ for digestion and absorption for nutrients is small intestine. Small intestine is distinguishable into three regions, a 'U' shaped duodenum, a long coiled middle portion jejunum and a highly coiled ileum. Mainly iron, calcium and amino acids are absorbed in duodenum; fatty acids, glycerol, monosaccharides and vitamins are absorbed in jejunum, and absorption of vitamin $B_{12}$, bile salts and water occur in ileum.

Hence, the correct answer is option: 'D'.

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