Echinoderms are not characterized by:

1. An absence of excretory system

2. Bisexual animals

3. Usually external fertilization

4. Indirect development with free swimming larva

Operculum and an air bladder are present in :

1. Clarias

2. Pristis

3. Trygon

4. Carcohrodon

Identify the incorrectly matched pair:

Pteropus is a/an:

Which of the following is not an arthropod characteristic?

1. Jointed appendages

2. Non-segmented bodies

3. Periodic moulting

4. Articulated exoskeleton

Amniotes include all except:

(1) Amphibians

(2) Reptiles

(3) Birds

(4) Mammals

Which of the following represents order of 'Horse'?

(1) Equidae

(2) Perissodactyla

(3) Caballus

(4) Ferus

An important characteristic that hemichordates share with chordates is

(1) absence of notochord

(2) ventral tubular nerve cord

(3) pharynx with gill slits

(4) pharynx without gill slits

Which among these is the correct combination of aquatic mammals?

(1) Seals, Dolphins, Sharks

(2) Dolphins, Seals, Trygon

(3) Whales, Dolphins, Seals

(4) Trygon, Whales, Seals

In case of poriferans, the spongocoel is lined with flagellated cells called

1. ostia

2. oscula

3. choanocytes

4. mesenchymal cells