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

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A is false but R is true

Both A and R are true and R is correct explanation of A

A is true R is false

Both A and R are true but R is not correct

answer is B.

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Detailed Solution

Bacteria has three basic shapes like cocci (round), bacilli (rod) and spirilla (spiral shaped).

Cocci form clusters and chains but bacilli form only chains but not clusters.

Hence, both A & R are true, but R is not correct.

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