Animal Kingdom

The characteristics of Class Reptilia are

1. body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca
2. fresh water animals with bony endoskeleton, air-bladder to regulate buoyancy
3. marine animals with cartilaginous endoskeleton, body covered with placoid scales
4. body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears.

Which one of the following groups of animals reproduces only by sexual means?

1. Cnidaria
2. Porifera
3. Protozoa
4. Ctenophora

Which one of the following animals is correctly matched with its one characteristic and the taxon?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Sharks and dogfishes differ from skates and rays because

1. gill slits are ventrally placed
2. head and trunk are widened considerably
3. distinct demarcation between body and tail
4. their pectoral fins distinctly marked off from cylindrical bodies.

Which one of the following pairs of animals are similar to each other pertaining to the feature stated against them?

1. Pteropus and Ornithorhynchus – Viviparity
2. Garden lizard and crocodile – Three chambered heart
3. Ascaris and Ancylostoma – Metameric segmentation
4. Sea horse and flying fish – Cold blooded (poikilothermal)

Which one of the following categories of animals, is correctly described with no single exception in it?

1. All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal).
2. All bony fishes have four pairs of gills and an operculum on each side.
3. All sponges are marine and have collared cells.
4. All mammals are viviparous and possess diaphragm for breathing.

Which one of the following characteristics is common both in humans and adult frogs?

1. Four chambered heart
2. Internal fertilization
3. Nucleated RBCs
4. Ureotelic mode of excretion

In which one of the following, the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct?

1. array|l|l|l| Genus name & Two characters & Class/Phylum \ Pila & (a) Body segmented & Mollusca \ & (b) Mouth with radula & \ array
2. array|l|l|l| Genus name & Two characters & Class/Phylum \ Asterias & (a) Spiny skinned & Echinodermata \ & (b) Water vascular system & \ array
3. array|l|l|l| Genus name & Two characters & Class/Phylum \ Sycon & (a) Pore bearing & Porifera \ & (b) Canal system & \ array
4. array|l|l|l| Genus name & Two characters & Class/Phylum \ Periplaneta & (a) Jointed appendages & Arthropoda \ & (b) Chitinous exoskeleton & \ array

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?

1. It is present only in larval tail in ascidian.
2. It is replaced by a vertebral column in adult frog.
3. It is absent throughout life in humans from the very beginning.
4. It is present throughout life in Amphioxus.

The figures (A – D) show four animals. Select the correct option with respect to a common characteristic of two of these animals. [Figure]

1. (A) and (B) have cnidoblasts for self-defence
2. (A) and (D) respire mainly through body wall
3. (C) and (D) have a true coelom
4. (B) and (C) show radial symmetry