Question

How can male and female Ascaris be identified?

• A. Posterior end of male is straight, while that of female is curved.
• B. Anterior end of female is curved, while that of male is straight.
• C. Posterior end of male is curved, while that of female is straight.
• D. Anterior end of male is curved, while that of female is straight.

Answer 1

The correct option is C Posterior end of male is curved, while that of female is straight.

Ascaris are the unisexual and shows sexual dimorphism. The male worm measure 12-23 cms in length and 3-4 mm in diameter. The tail (posterior end) is curved ventrally in the form of a hook, with a conical tip. Whereas the female worm is longer and stouter than males measuring 25-49cms in length and 5mm in diameter. The tail ( posterior end ) is straight and blunt. Thus, the correct answer is option C.