Planaria possess a high capacity of:

1. metamorphosis

2. regeneration

3. alternation of generation

4. bioluminescence

The figure shows four animals (a), (b), (c) and (d). Select the correct answer with respect to a common characteristic of two of these animals:

(a)		(b)
(c)		(d)

1. (c) and (d) have a true coelom
2. (a) and (d) respire mainly through body wall
3. (b) and (c) show radial symmetry
4. (a) and (b) have cnidoblasts for self-defence

One example of animals having a single opening to the outside that serves both as mouth as well as the anus is:

1. Octopus

2. Asterias

3. Ascidia

4. Fasciola

Which one of the following kinds of animals are triploblastic?

1. Flatworms

2. Sponges

3. Ctenophores

4. Corals

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