Which of the following developed for the first time in Annelids?

(1) Cephalization

(2) Development of a true coelom

(3) Metameric segmentation

(4) Both 2 and 3

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 dueterostomes

(4) Reptiles and Mammals

Which human worm infestation are we talking about?

I. In socio-economic impact on the human race, it is second only to Malaria.

II. The worm larva enters the human body by penetrating the skin

III. The worm requires snails as an intermediate host.

IV. In developing countries, it is a common cause of anaemia in children.

(1) Elephantiasis

(2) Bilharziasis

(3) Cysticercosis

(4) Plague

Consider the following characteristics of Porifers:

I. Collared cells called as choanocytes

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

III. Mineral spicules

IV. High cellular mobility and totipotency

Which of these can be regarded as synapomorphies of Porifera?

Identify the incorrect statement:

(1) Medusae 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?

I. An endoskeleton of calcareous ossicles

II. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical.

III. They are triploblastic and coelomate animals.

IV. Digestive system is complete.

V. Water vascular system

VI. Sexual reproduction, internal fertilization and direct development.

(1) 3

(2) 4

(3) 5

(4) 6