What will you look for to identify the sex of the following

Options

A. Female Ascaris - Sharply curved posterior end
B. Male frog- A copulatory pad on the first digit of the hind limb
C. Female cockroach - Anal cerci
D. Male shark-Claspers borne on pelvic fins

Answer

D

Explanation

The female Ascaris worm is longer and stouter than the male. The posterior extremity is neither curved nor pointed but is conical and straight. The male worm is shorter and thinner than the female. The tail end of the male is curved ventrally in the form of a hook having a conical tip.
Amplexusary nuptial pads are developed on first finger of each hand of the male frog.
Male and female cockroach both have anal cerci , only male has anal styles projecting from the `9^(th)` sternum.
Only male sharks have claspers on pelvic fins.