Which of the following is osmotically fragile?

Which of the following statements is consistent with Halophiles?

Select the incorrect statement regarding conjugation.

During favourable conditions,bacteria mainly reproduce by:

In which of the following does oxygenic photosynthesis occur?

Assertion $A$: Some bacteria are motile.
Reason $R$: Some bacteria have tubular pili or fimbriae extensions arising from their surface.
Which option is correct for Assertion $A$ and Reason $R$?