Question

Female Ascaris is differentiated from male by having

• A. Cloaca
• B. Penial setae
• C. Shorter size
• D. Straight posterior end

Answer 1

The correct option is D Straight posterior end

Ascaris is an animal genus comprised of intestinal roundworms. Ascaris lumbricoides lives in humans, and ascaris suum in pigs. Although the male and female worms look similar, there are several characteristics that distinguish the two sexes, both externally and internally. Externally, the sexes can be identified by size and the presence or absence of bodily structures. Internally, they can be distinguished by their reproductive organs. Females are usually wider around and grow to be 20-40 cm long, while males are usually thinner and grow to be 15-30 cm long. Examine the posterior end of the worm. Female worms are straight while males are hooked.

So, the correct answer is 'Straight posterior end'.