Q18 / 180 · AIIMS 2016 · Botany

Assertion : Pili are tubular structures present in bacteria which help in conjugation. Reason : Formation of pili is controlled by $\mathrm{F}^{+}$ or fertility factor .

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    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.
  • D
    If both assertion and reason are false.

Solution

Pili are long and thick tubular outgrowths, which develop in response to $\mathrm{F}^{+}$or fertility factor in Gram negative bacteria. They are made up of protein pilin. A donor bacterial cell having fertility factor develops 1-4 pili. Pili are helpful in attaching to recipient cell and forming conjugation tube.

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

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