Question

Which of the following character is common in Ascaris and cockroach?

• A. Pseudocoel
• B. Sexual dimorphism
• C. Nephridia
• D. Dorsal tubular nerve cord

Answer 1

The correct option is B Sexual dimorphism

Dimorphism means the presence of two morphological forms and sexual dimorphism means the presence of two sexes in two morphologically distinct bodies i.e male and female. Both Ascaris and cockroach show morphologically distinct male and female bodies. A cockroach does not have a pseudocoelom and Ascaris lacks nephridia. None of these two possesses dorsal tubular nerve cord, which is a chordate character. So, the correct answer is option B.