Consider the following characters:

I. Air bladder

II. Operculum

III. Viviparity

The characters present in bony fishes include:

1.	I, II and III	2.	I and III only
3.	I and II only	4.	II and III only

Homeothermy is exhibited by:

1. All amniotes

2. Birds and Mammals

3. All deuterostomes

4. Reptiles and Mammals

Consider the following characteristics of Porifers. Which of these can be regarded as synapomorphies of Porifera?

1. Collared cells called as choanocytes

2. Canal system with pores (ostia) in body wall

3. Mineral spicules

4. High cellular mobility and totipotency

Identify the incorrect statement:

1. Medusa of Scyphozoans are called as jelly fishes.

2. Ctenophores are the largest animals that move with the help of cilia.

3. Flat worms that have a digestive cavity, have an incomplete gut.

4. Nematodes are covered with thick cuticle that does not moult.

Match Nematode with their common names and choose answer from codes given below:

Codes:

What is the most important reason for the immense success of arthropods?

1. Chitinous exoskeleton

2. Uricotelic nature

3. Compound eye

4. Multipurpose appendages

What is not true for a generalized mollusc?

1. Body segmented into head, visceral mass and foot.

2. A rasping tongue like organ – radula present.

3. Mantle cavity with gills

4. Excretory structures – nephridia

How many of the characters given below are true for echinoderms?

1. 3
2. 4
3. 5
4. 6

Which of the following is not seen in hemichordates?

1. A tripartite body organization

2. Stomochord

3. Rudimentary notochord

4. Proboscis gland

Consider the following features:

I. Ampulla of Lorenzini

II. Operculum or gill cover

III. Ureotelism

IV. Viviparity

V. Swim bladder

VI. Lateral line system

The features that can be attributed to cartilaginous fishes are:

1. I, III and IV only

2. II, V and VI only

3. I, II, III and IV

4. All