Question

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

• 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
• D. If both assertion and reason are false

Answer 1

Answer: (B)

Pili are long and thick tubular outgrowths, which develop in response to 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.