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. | Freshwater animals with a bony endoskeleton and air bladder to regulate buoyancy |
3. | Marine animals with cartilaginous endoskeletons, bodies covered with placoid scales |
4. | Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears |
Crocodile and Penguin are similar to Whale and Dogfish in which one of the following features?
1. Lay eggs and guard them till they hatch
2. Possess bony skeleton
3. Have gill slits at some stage
4. Possess a solid single-stranded central nervous system
1. | Scales on their hind limbs |
2. | Four-chambered heart |
3. | Two special chambers crop and gizzard in their digestive tract |
4. | Eggs with a calcareous shell |
Which of the following pairs are correctly matched?
Animals | Morphological features | |
A. | Crocodile | 4-chambered heart |
B. | Sea urchin | Parapodia |
C. | Obelia | Metagenesis |
D. | Lemur | Thecodont |
1. A, C, and D
2, B, C, and D
3. Only A and D
4. Only A and B