First slide

Classification of Animals

Question

Select the correct statement about sexual dimorphism.

Moderate

A

Scoliodon : Claspers are present in males but not females
B

Ascaris : Male is longer than female
C

Periplaneta: Anal styles are present in female but not male
D

Rana: Vocal cords are present in males but not in females

Solution

In cartilaginous fishes (Chondrichthyes, e.g., Scoliodon), pelvic fins of male bear claspers which serve as intromittent (copulatory) organs.
In Aschelminthes (e.g., Ascaris), often female is longer than male.
In cockroach, anal styles are present in male but not female.
Vocal cords are present in both male and female frogs. Vocal sacs are present only in male frogs.

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