Biradial symmetry and lack of cnidoblasts are the characteristics of :

(1) Starfish and sea anemone

(2) Ctenoplana and Beroe

(3) Aurelia and Paramecium

(4) Hydra and starfish

In which one of the following sets of animals do all the four give birth to young ones?

(1) Lion, bat, whale, ostrich

(2) Platypus, penguin, bat, hippopotamus

(3) Shrew, bat, cat, kiwi

(4) Kangaroo, hedgehog, dolphin, Loris

Two common characters found in centipede, cockroach and crab are:

(1) compound eyes and anal cerci

(2) jointed legs and chitinous exoskeleton

(3) green gland and tracheae

(4) book lungs and antennae

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is

(1) Eptatretus

(2) Myxine

(3) Neomyxine

(4) Petromyzon

Metagenesis refers to

1. the presence of different morphic forms

2. alternation of generation between asexual and sexual phases of an organism

3. occurance of a drastic change in form during post embryonic development

4. the presence of a segmented body and parthenogenetic mode of reproduction

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells

and indirect development are the characteristics of phylum

1. Coelenterata

2. Porifera

3. Mollusca

4. Protozoa

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

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