Which of the following groups exhibits the most extensive nutritional diversity?

Which of the following statements correctly describes $Cyanobacteria$?

Assertion: Bacteria have three basic shapes,i.e.,round,rod,spiral.
Reason: Cocci and Bacilli may form clusters or chains of a definite length.

The formation of $Akinetes$ occurs in ..........

In the five kingdom system of classification,which single kingdom out of the following can include blue-green algae,nitrogen-fixing bacteria,and methanogenic archaebacteria?

Why is $Mycoplasma$ pleomorphic?