The term "hook worm" is commonly used for

(1) Ancylostoma duodenale

(2) Trichinella spiralis

(3) Enterobius vermicularis

(4) Ascaris lumbricoides

Consumption of raw or undercooked fish may lead to the infestation by

Which of the following does not cause subcutaneous filariasis?

(1) Loa loa (The African eye worm)

(2) Onchocerca volvulus

(3) Dracunculus medinensis (the guinea worm)

(4) Wuchereria bancrofti

The largest known invertebrate belongs to the phylum

1. Echinodermata

2. Arthropoda

3. Molluska

4. Annelida

Closed circulatory system is not seen in

(1) Vertebrates

(2) Annelids

(3) Cephalopod Mollusks

(4) Aquatic arthropods

In _____________ gills, instead of being enclosed in the mantle cavity, are exposed along the dorsal surface.

1. Bivalves

2. Squids

3. Nudibranchs

4. Octopuses

The presence of mutable collagenous tissue is an important feature of

(1) Annelida

(2) Echinodermata

(3) Porifera

(4) Molluska

Which of the following is not a chordate feature?

Fishes are not characterized by

An example of jawless fish with no paired appendages is

1. Ray-finned fish

2. Lobe-finned fish

3. Hagfish

4. Shark