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

Earthworms are

1. dioecious

2. hermaphroditic but not self-fertilizing

3. asexually reproducing

4. hermaphroditic and self-fertilizing

Silk thread is obtained from silk moth during

(1) Pupal stage

(2) Larval stage

(3) Nymph stage

(4) Adult stage

Identify the mollusk that has a closed circulatory system.

1. Polychaete

2. Snail

3. Oyster

4. Octopus

Annelids belonging to the class Polychaetes usually lack

1. A coelom

2. Parapodia

3. Setae

4. Permanent gonads

Which of the following fishes is larvicidal and can be used for biological control of mosquitoes?

1. Carp

2. Hagfish

3. Gambusia

4. Bombay duck

Which of the following is the first larval stage of a typical mollusk?

1. Trochophore

2. Planula

3. Veliger

4. Oligophore

What is correct for both Annelids and Platyhelminths?

Male and female cockroaches can be distinguished externally through