In some animal groups, the body is found to be divided into compartments with at least some organs/organ repeated. Name this characteristic feature.

1

(a)

It is the segmentation that simultaneously divides body both externally and internally and is also called metamerism.

Body cavity is the cavity present between the body wall and gut wall. In some animals, the body cavity is not lined by mesoderm, Such animals are called ______.

1

(a)

Pseudocoelomates.

Identify the animal in which adults exhibit radial symmetry and larvae exhibit bilateral symmetry?

1

(a)

In Eichnodermata, the adults are radially symmetrical and larvae are bilaterally symmetrical.

Give an example of animal which exhibits alternation of generation.

1

(a)

Obellia,shows alternation if asexual and sexual phases in its life cycle.

Given below are types of cells present in some animals each one is specialised to perform a single function.
(a) choanocytes
(b) interstitial cells
(c) gastrodermal cells
(d) nematocytes 

1

(a)

Interstitial cells are reserve cells in coelenterates.They are also called as totipotent cells and can be converted into any type of cells or into a full of organism.

Which one of the following statement is correct?

1

(a)

Mesoglea is present in between ectoderm and endoderm in Obelia.

(b)

Radial Symmetry is found in Asterias

(c)

Fasciola is a pseudocoelomate animal.

(d)

Taenia is a triploblastic animal.

Write the scientific name of roundworm.

1

(a)

Ascaris lumbriocoides

Name the animal which exhibits the phenomenon of bioluminescence.Mention the phylum to which it belongs

1

(a)

Pleurobrachia,phylum-Ctenophora

Provide appropriate technical terms for lateral appendages in aquatic annelids.

1

(a)

Parapodia for lateral,unjointed and paired appendages

Which of the following statements is incorrect?

1

(a)

In cockroaches and prawns excretion of waste material occurs through Malphigian tubules.

(b)

In Ctenophora,locomotion is mediated by comb plates.

(c)

In Fasciola, flame cells take part in excretion.

(d)

Earthworms are hermaphrodite and yet cross-fertilisation takes place among them