a. In earthworm, a single male genital pore is present

It is a wrong statement because in earthworms the presence of a pair of male genital pore.

b. Setae help in locomotion of earthworm.

It is a correct statement

c. Muscular layer in the body wall of an earthworm is made up of only circular muscles.

It is a wrong statement because muscular layer in the body of the earthworms are not only made up of circularly muscles but it is also longitudinal muscles.

d. Typhlosole is the part of the intestine of earthworm.

It is a correct statement