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

1.	Acoelomate	2.	Pseudocoelomate
3.	Coelomate	4.	Haemocoelomate

‘Cephalization’ in animals was facilitated by evolution of:
1. Radial symmetry
2. Tissue grade organization
3. Bilateral symmetry
4. True coelom

Identify the correct statement:
1. All pseudocoelomates are protostomes
2. All bilaterally symmetrical animals have a coelom
3. All animals have at least a tissue grade organization
4. All radially symmetrical animals are diploblastic

Animals with bilateral symmetry have all the following except:
1. Anterior and posterior end
2. Right and left half
3. Dorsal and ventral surface
4. Oral and aboral surface

Biradial symmetry is seen in members of:
1. Cnidaria
2. Ctenophora
3. Molluska
4. Hemichordata

A cell isolated from a four-cell stage larva can develop into a complete animal in:
1. Snail
2. Earthworm
3. Sea urchin
4. Drosophila

Triploblastic organization, bilateral symmetry but lack of coelom will be seen in:

All the following are features of non chordates except:
1. A dorsal heart, if present
2. Ventral, solid and double central nervous system
3. Absence of gill slits
4. Post anal tail

Identify the incorrectly matched pair:

Cyclostomes: