Which of the following is a ‘fish’ in true taxonomic sense?
1. Shellfish
2. Lungfish
3. Cuttlefish
4. Crayfish

Nematodes lack:
1. A body cavity
2. Collagenous cuticle
3. Circumferential muscles in body wall
4. A hydrostatic skeleton

Rhabdom is a part of:

The following schematic diagram of a part of skeleton can be that of a/an:

Ospharidia in mollusks are:

Which part of the fish heart is the sinus venosus in the given diagram?

1. A
2. B
3. C
4. D

Tagmatization, a feature of many arthropods, is:

Which of the following reptilian hearts can be that of a crocodile?

1.		2.
3.		4.

‘Madreporite’ is a part of:

The structure marked as ‘S’ in the given diagram helps bony fishes in: