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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
MCQ
Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Vitamins $B_2$ is found in cereals, green vegetables, brewer's yeast, egg white, milk and liver.
Reason: Vitamins $B_2$ can be commercially produced by some yeasts.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: B.
Both assertion and reason are true but reason is not the correct explanation of assertion.

Besides cereals, green vegetables, brewer's yeast, egg white, vitamin $B_2$ is also produced by intestinal bacteria. The vitamin was first obtained in $1938$ using wild strain of mould Ashbya gossypii. Vitamin $B_2$ is essential for normal growth and reproduction in a number of laboratory animals. It is essential for the maintenance of good health in humans. Better strains of the mould have been discovered which give $100-300$ times more yield of the vitamin than the original one. Other sources include yeast cells, Eremothecium ashbyii, Clostridium species.

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