Which of the following represent the correct combination without any exception?

Characteristic	Class
(1) Mammary gland; hair on body; pinnae; two pairs of limbs	Mammalia
(2) Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord	Chondrichthyes
(3) Sucking and circular mouth; jaws absent; integument without scales; paired appendages	Cyclostomata
(4) Body coverd with feathers; skin moist and glandular; lungs with air sacs; fore limbs form wings	Aves

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