Question

General characterstics of mamals and classified it upto subclass with examples

Answer 1

Answer:General Characters of Mammals:

1. Body of mammals is covered by epidermal hair.

2. Integumentary glands are — sweat (sudoriferous), sebaceous (oil), scent (odoriferous) glands.

3. Mammary glands are present to supply milk for the nourishment of suckling young.

4. External fleshy pinna is present in mammals.

5. Eyes with upper and lower eyelids and often with eyelashes.

6. Nictitating membrane is translucent and hairless; it is vestigial in higher mammals.

7. A muscular diaphragm is present in between the thoracic and abdominal cavities.

8. Endo-thermal homoeotherm animals.

9. RBCs are non-nucleated, biconcave and usually circular in form.

10. The four-chambered heart is highly powerful.

11. Only left aortic arch is present in the arte­rial system.

12. Cerebral hemispheres are very large and highly convoluted.

13. Cerebellum is large, complex and solid in mammals.

14. There is a single urinary bladder in mammals.

15. Testes remain in scrotal sacs.

Scheme of Classification of Mammals:

Like other chordates, the classification of mammals is a very controversial and com­plex matter. There are several schemes of classification that exists in different litera­tures. But none of the existing classifications is beyond criticism.