Question

Read the following statements and choose the correct options
I. Pelvic fins of female sharks bear claspers.
II. In Obelia polyps produce medusae sexually and medusae asexually.
III. Flame cells in platyhelmintes help in osmoregulation and excretion.
IV. In nonchordates, central nervous system is ventral, solid and double.
V. Pinnae are present in mammals.

• A. II, IV and V only are correct
• B. I, III and V only are correct
• C. III, IV and V only are correct
• D. I, II and III only are correct
• E. II and III only are correct

Answer 1

Answer: (C)

III, IV and V only are correct

Claspers are only present in male sharks which are used for reproduction.

In Obelia, Medusa is the sexual stage whereas a polyp is an asexual stage.

Flame cells are special cells present in Platyhelminthes that help them in various processes like excretion and regulation. They have kidney like functions and hence also help in osmoregulation.

Non-chordates have a Central nervous system that is solid, ventral, double. It also has ganglia unlike chordates.

Pinnae are external extensions to ears that help and redirecting sound and detecting the direction of sound. It is only present in a few mammals.

So the correct answer is 'II, IV and V only are correct'.