During the embryonic development in echinoderms:
 

1.	left side of the body of bilaterally symmetrical larva grows at the expense of the right side
2.	right side of the body of bilaterally symmetrical larva grows at the expense of the left side
3.	the posterior part of the body undergoes torsion and comes to anterior end
4.	the anterior part of the body undergoes torsion and comes to posterior end

The body structure of a porifer shown in the given diagram is:

1. Asconoid
2. Syconoid
3. Leuconoid
4. Mucoid

A mutable collagenous tissue is seen in the members of:
1. Cnidaria
2. Platyhelminthes
3. Mollusks
4. Echinoderms

Consider the two statements:

1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. Only I is correct
4. Both I and II are incorrect

A unique feature in nematodes is:
1. Moulting of cuticle
2. A blind sac body plan
3. Females are much smaller than males
4. Projections run from the inner surface of muscle cells towards the nerve cords

Consider the two statements:

Consider the two statements:

A viviparous nematode is:
1. Enterobius vermicularis
2. Trichuris trichiura
3. Trichinella spiralis
4. Ascaris lumbricoides

A trochophore larva is shared by members of:
1. Molluscs and Annelids
2. Molluscs and Arthropods
3. Annelids and Arthropods
4. Molluscs and Nematodes

Biradial symmetry is most obvious in: