Question 1

Which of the following animal groups is exclusively marine?

Accepted Answer

Echinodermata is an exclusively marine phylum. Organisms belonging to this phylum, such as starfish, sea urchins, and sea cucumbers, live exclusively in marine habitats and are not found in fresh water or terrestrial environments.

Question 2

Choanocytes or collar cells are characteristic features of which phylum?

Accepted Answer

Choanocytes or collar cells are unique to the phylum Porifera (sponges). These specialized flagellated cells line the spongocoel and canals, helping in creating water current and capturing food particles.

Question 3

Which of the following animals exhibits the phenomenon of bioluminescence?

Accepted Answer

Bioluminescence (the property of a living organism to emit light) is well-marked in Ctenophora (comb jellies).

Question 4

Metameric segmentation is the characteristic feature of:

Accepted Answer

Metameric segmentation is a characteristic feature of Annelida, where the body is externally and internally divided into segments with a serial repetition of at least some organs.

Question 5

Which of the following is a living fossil?

Accepted Answer

Limulus (King crab) is considered a living fossil because it has remained unchanged in form for millions of years while other related species have gone extinct.

Animal Kingdom