Test: Animal Kingdom- Non Chordates : Porifera to Hemichordata (April 14) - NEET MCQ

Nereis belongs to phylum Annelida and scorpion, cockroach and silver fish belong to phylum Arthopoda. They all possess dorsal heart.

Hydra vulgaris is a fresh water animal.

In sponges, sexes are not separate (hermaphrodite) i.e., eggs and sperms are produced by the same individuals. Sperms leave one sponge and enter another with water current to fertilize the ova (eggs) in situ. Thus, fertilization is internal.

Moth has short and feather like antennae while butterfly has Iong, filamentous and club-shaped antennae.

Figure 'C' is of Octopus (mollusc) and figure 'D' is of scorpion (arthropod). Both have true coeloms. Figure A is of tapeworm (platyhelminth) and Figure B is of Aurelia (cnidarian). Both arp acoelomates.

Circulatory system in arthropods is of open type. i.e., blood flows in irregular spaces called lacunae. It does not flow in definite blood vessels.

Silver fish, scorpion, dragonfly and prawn belong to the phylum Arthropoda and thus jointed appendages and chitinous exoskeleton.

Figure 'A' is of Hydra which has radial symmetry and figure 'B' is of Cancer (crab) which has bilateral symmetry.

All sponges have high regenerative power. Their skeleton may consist of calcareous or siliceous spicules. Some sponges live in fresh water e.g. Spongilla. Most of the sponges are asymmetrical, some are radially symmetrical.

Silver fish, scorpion, crab and honey bee, all belong to the phylum Arthropoda. The members of this phylum have characteristic feature of jointed appendages.