Question

Assertion: pili are non-motile appendages of bacteria
Reason: pili take part in conjugation
A both assertion and reason are correct and reason is the correct explanation of assertion
B. both assertion and reason are correct but reason is not the correct explanation for assertion
C. assertion is correct but reason is incorrect
D. Both assertion and reason are incorrect

Answer 1

The Pilin is the protein seen in bacteria and this protein in bacteria cell extends to form of structures from the body of a bacteria and their function is to attach the cells to the surface, The pill are almost similar to fimbriae but Pili can be seen only in their gram negative bacteria whereas fimbriae can be seen in both gram negative and gram positive bacteria.

Complete answer:
Assertion: Pili is a non – motile appendages
Pili helps in the movement just as fimbriae they are the outgrowth of membrane they are called as non motile appendages and the flagella is called as motile appendages in bacteria which helps in the movement or locomotion contain F+ bacteria called as fertility factor which is converted into F – factor
Assertion is true.

Reason: Pili take part in conjunction
This statement is true they are the extensions from the cell body of the bacteria which helps the moment of the bacteria through this movement they contain F+ bacteria called as fertility factor which is converted into F – factor they can transfer genetic material from donor to recipient which helps in the process of conjugation.
Reason is true.

So from the whole explanation it is clear that Both assertion and reason is correct but reason is not the correct explanation to assertion.

Note: The reason does not explain the assertions as to you the pili are non motile appendages and the reason explains about the different advantage of the pili which is true but not related to the non motile concept. Pili and fimbriae both are protein structures on the cell body of bacteria. They have many advantages along with locomotion and conjugation .Pili is an adhesion mechanism which helps the bacteria to attach to the ground or to other cells for the process of survival and continuous function of the cell.