Both polyp and medusa life forms are present in the life cycle of

(1) Obelia

(2) Physalia

(3) Aurelia

(4) Adamsia

The skeleton of corals is made up of

(1) Calcium silicate

(2) Calcium phosphate

(3) Hydroxyapatite

(4) Calcium carbonate

Which of the following group consists exclusively of cnidarians?

(1) Aplysia, Gorgonia, Spongilla, Hydra

(2) Hydra, pennatula, obelia, Echinus

(3) Hydra, obelia, adamsia, physalia

(4) Scypha, Hydra, adamsia, physalia

Ctenophora is an exclusively marine phylum, the other such phylum is

(1) Mollusca

(2) Echinodermata

(3) Porifera

(4) Coelenterata

Ctenophorans are commonly referred to as

(1) Flatworms

(2) Comb jellies

(3) Sea anemone

(4) Cnidaria

The number of ciliated rows present in Comb jellies are

(1) 8

(2) 6

(3) 4

(4) 9

The function of flame cells are

(1) Digestion and excretion

(2) Attachment and osmoregulation

(3) Anchorage and excretion

(4) Excretion and osmoregulation

Presence of flame cells is a characteristic feature of

(1) Nereis

(2) Taenia

(3) Hirudinaria

(4) Pheretima

Which of the following is not an excretory structure found in invertebrates?

1. Flame cells

2. Malpighian tubules

3. Nephridia

4. Kidney

Nematocytes are present in

(1) Adamsia

(2) Hirudinaria

(3) Sycon

(4) Echinus