The most successful animal phylum is

(1) Chordata

(2) Molluska

(3) Arthropoda

(4) Platyhelminthes

The important characteristics of arthropods include

(1) Jointed appendages

(2) Chitinous exoskeleton

(3) Segmented body

(4) All of these

The class of arthropoda that has maximum number of species is the

(1) Crustacea

(2) Arachnida

(3) Insecta

(4) Centipedes

Which of the following is a character of Echinoderms?

1. Bilateral symmetry

2. Radial symmetry

3. Porous body

4. Soft skin

Aristotle's lantern belongs to the class

(1) Echinoidea

(2) Asteroidea

(3) Holothuroidea

(4) Ophiuroidea

The early cleavage in echinoderms is

1. Determinate

2. Indeterminate

3. Retrogressive

4. Terminal

An important evolutionary transition that appeared for the first time in echinoderms is

(1) Bilateral symmetry

(2) Radial symmetry

(3) Tube within a tube plan

(4) Endoskeleton

Tube feet occur in

1. Cockroach

2. Star fish

3. Cuttle fish

4. Cat fish

The adults are radially symmetrical but the larvac show bilateral symmetry in

1. Annelida

2. Mollusca

3. Echinodermata

4. Porifera

A porous calcareous plate in most echinoderms, through which water enters the water-vascular system, is called

1. Tube feet

2. Madreporite

3. Spines

4. Pedicellariae