Question

Write the characteristics of Class Mammalia.

Answer 1

Answer:

1. These animals are warm blooded, hairy and have mammary or milk producing glands, (mammary glands). They are the only animals which nourish their young ones with milk. There are about 4,000 species of mammals found in the world.

2. They are homoiothermous (warm blooded).

3. Oil glands (sebaceous glands) and sweat glands (sudoriferous glands) are present in the skin.

4. Teeth are of different types (heterodont) and are embedded in the sockets of jaws (the codont). These are developed twice during the life-time of the animal (diphyodont), milk and permanent teeth.

5. Except a few, mammals possess seven cervical (neck) vertebrae.

6. The skull is dicondylic i.e., with two occipital condyles.

7. Respiration is by lungs.

8. They possess a muscular diaphragm dividing trunk into thorax and abdomen.

9. The coelom is divided into four cavities; a pericardial cavity lodging the heart, two pleural cavities each containing the lung and an adominal cavity having the rest of viscera.

10. The heart is four chambered. Sinus venosus is absent. The red blood corpuscles are without nucleus. Renal portal system is absent.

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Answer 2

Answer:

characteristics of class mammalia are

1.they are viviparous .

2.Mammary gland is present in female for the nourishment of their baby .

they are warm blooded animals .

they have well developed nervous system .

they have four chambered heart .

they are ureotellic .