Consider the two statements:

I:	Platyhelminthes are restricted to environments where dehydration is unlikely.
II:	They are dorso-ventrally flattened.

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:

A very rare reproductive system seen in Coenorhabditis elegans is described as:
1. Androdioecy
2. Faculatative sexuality
3. Meiotic parthenogenesis
4. Mitotic parthenogenesis

All mollusks do not have:

In nematodes:
1. The head is radially symmetrical while the body is bilaterally symmetrical.
2. The body is radially symmetrical while the head is bilaterally symmetrical.
3. Both body and head are radially symmetrical.
4. Both body and head are bilaterally symmetrical.