Question

20. Feathers are… 1. Living structures that continue to grow longer as the bird gets older. 2. Never shed except by accident. 3. Shed in a highly orderly manner. 4. Usually shed all at once and then gradually replaced. 5. Replaced only after one is lost   

18
21. The ancestor of terrapins belongs to the subclass… 1. Diapsida. 2. Synapsida. 3. Parapsida. 4. Anapsida. 5. None of the above.
22. In birds the nitrogenous waste products of metabolism are eliminated in the form of… 1. Ammonia. 2. Urea. 3. Uric acid. 4. Ammonia and Urea. 5. Peptides.
23. Mammals belong to the… 1. Anapsid lineage. 2. Synapsid lineage. 3. Diapsid lineage. 4. Polydont lineage. 5. Dinosaur lineage.   
24. Which one of the following best describes the scent glands…? 1. Are intimately associated with hair follicles. 2. They are used in communication with members of the same species. 3. Are probably modified apocrine glands. 4. Are simple, tubular, highly coiled glands that occur over much of the body in most mammals. 5. They secrete a watery sweat.
25. The synapsid skull is characterised by… 1. Two fossae on the temporal bone. 2. A single fossa on the dentary. 3. A single fossa on the temporal bone. 4. A beak-like process that associates the turtles and birds. 5. No fossa on the temporal bone.

Answer 1

Ans:- 20,

C,

Feathers are shed in a highly orderly manner.

21,

4

Anapsida,

The ancestor of terrapins to the subclass anapsida.

22,

3

Uric acid

In birds the nitrogenous waste products of metabolism are eliminated in the form of uric acid.

23,

2

Synapsid lineage,

Mammals belongs to the synapsid lineage.