13. What is another name for rod shaped bacteria?

A. bacilli

B. cocci

C. spirilla

Option A, bacilli

Explanation:

Bacteria's are classified on the basis of their shape into the following categories -

a) Spherical or round shapes - Such bacteria's are knowns as coccus

b) Rod Shaped or cylindrical shaped - Such bacteria's are known as Bacillus

c) Twisted or turn around shape - such bacteria's are known as Spiral

d) comma shaped - Such bacteria's are called as vibrios

Hence, option A is correct as rod shaped bacteria's are known as bacilli.

A. Bacilli is your answer