Pick the odd pair out.

(1) Porifera : choanoflagellates

(2) Cnidaria : nematocysts

(3) Nematoda : pseudocoelom

(4) Mollusca : torsion

Chitin is a polysaccharide found in the exoskeleton of

(1) prawn

(2) insects

(3) crabs

(4) all of these

Which of these is not a coelenterate?

(1) Sea pen

(2) Sea fur

(3) Sea anemone

(4) Sea lily

Protonephridia are the excretory structures present in

(1) Planaria

(2) roundworm

(3) tapeworm

(4) Both 1 and 3

Carapace is present can be observed in

(1) Hemidactylus

(2) Testudo

(3) Naja

(4) Bufo

Closed circulatory system is not found in

(1) octopus

(2) tunicates

(3) echinoderms

(4) squids

Polyp phase is absent in the life cycle of:

(1) Hydra

(2) Hormiphora

(3) Pennatula

(4) Physalia

Which of the following is a fish?

(1) Flying fish

(2) Jelly fish

(3) Devil fish

(4) Star fish

Which of the following is not an annelid?

1. Leech

2. Earhtworm

3. Sea mouse

4. Sea cucumber

Buoyancy in a bony fish is maintained with the help of

(1) streamlined body

(2) paired fins

(3) swim bladder

(4) all the above