Pheretima posthuma is highly useful as

1. Their burrows make the soil loose

2. They are used as fish meal

3. They make the soil porous, leave their castings and take organic debris in the soil

4. They kill the birds due to biomagnification of chlorinated hydrocarbons

Which of the following classes of mollusks does not bear a rasping radula?

1. bivalves

2. gastropods

3. cephalopods

4. chiton

The total number of hearts possessed by an earthworm are

Blood of Pheretima is

1. Blue with haemocyanin in corpuscles

2. Blue with haemocyanin in plasma

3. Red with haemoglobin in corpuscles

4. Red with haemoglobin in plasma

Which of the following is a locomotory structure in the mentioned organism?
1. Trichocyst in Paramecium
2. Pedicellariae of Star Fish
3. Clitellum in Pheretima
4. Posterior sucker of Hirudinaria

A common trait amongst Earthworm, Leech, and Centipede is

Nephridia of Earthworm are analogous to

(1) Nematoblasts of Hydra

(2) Tracheae of insects

(3) Flame cells of Planaria

(4) Gills of prawn

Enteronephric nephridia of Earthworm are connected with

1. Excretion

2. Respiration

3. Digestion

4. Osmoregulation

The number of tentacles in squids is

1. 12

2. 4

3. 10

4. 80-90

A funnel lined by cilia, used by mollusks for excretion, is called as

1. Nephrostome

2. Flame cell

3. Operculum

4. Parapodium