Chitinous exoskeleton is present in

(1) Mollusca

(2) Echinodermata

(3) Arthropoda

(4) Porifera

Nematocytes are present in

(1) Adamsia

(2) Hirudinaria

(3) Sycon

(4) Echinus

Ancylostoma is also known as

(1) Pinworm

(2) Hookworm

(3) Flatworm

(4) Filarial worm

Which of the following is called pearl oyster?

1. Dentalium

2. Pinctada

3. Pila

4. Aplysia

Which of the following is not an excretory structure found in invertebrates?

1. Flame cells

2. Malpighian tubules

3. Nephridia

4. Kidney

Radial symmetry is seen in

(1) Mollusca

(2) Chordata

(3) Porifera

(4) Ctenophora

Which of the following is dioecious?

(1) Taenia

(2) Fasciola

(3) Ascaris

(4) Earthworm

In which of the following are air sacs connected to the lungs?

1. Neophron

2. Testudo

3. Ornithorhynchus

4. Chelone

Which of the following shows organ and organ system level of organisation for the first time?

(1) Annelida

(2) Ctenophora

(3) Platyhelminthes

(4) Aschelminthes