A mollusk has chemosensory structures that resemble the ears of a hare. This mollusk can be:
1. Chaetopleura
2. Dentalium
3. Aplysia
4. Loligo

Which of the following is not a character of deuterostomes?
1. Radial cleavage

2. Schizocoelous coelom

3. Indeterminate cleavage

4. Blastopore forms anus

Which of the following does not belong to Protostomia?
1. Annelids
2. Mollusks
3. Echinoderms
4. Arthropods

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

Which of the following endoparasites of humans does show viviparity?
1. Enterobius vermicularis
2. Trichinella spiralis
3. Ascaris lumbricoides
4. Ancylostoma duodenale

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.

Development takes place through a trochophore or veliger larva in:
1. Annelida

2. Mollusca

3. Arthropoda

4. Echinodermata

Consider the two statements:
I. Moulting may be responsible for 80 to 90% of all arthropod deaths.
II. The exoskeleton cannot stretch and thus restricts growth and hence moulting.

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

Identify the incorrect statement regarding cyclostomes:
1. Lampreys have direct development, but Hagfishes go through a larval stage followed by metamorphosis into a juvenile form.
2. Unlike jawed vertebrates, which have three semicircular canals in each inner ear, lampreys have only two and hagfishes just one.
3. The hagfish blood is isotonic with seawater, while lampreys appear to use the same gill-based mechanisms of osmoregulation as marine teleosts.
4. Both hagfishes and lampreys have a single gonad.