Question

characters of reptilia​

Answer 1

The first and foremost of the characteristic reptiles that are cold blooded.

They are able to regulate inner their body temperature to the temperature of environment. They have scaly skins but absence of hair or fur. This scale of the reptiles develop as a surface cells filled with keratin.

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Answer 2

$\huge\bold{Reptilia:}$

Reptilia is the 4th class of 2nd subphylum Gnathostomata in the category of Vertebrata.

$\large\bold{Characteristics:}$

1. Ectothermic or cold blooded terrestrial or aquatic vertebrates with a body covered with dry water proof skin having epidermal scales and dermal scute plates.

2.Body varies in form and us usually divided into head, neck, trunk as well as trunk.

3. Limbs are like five toed type with clawed digits
$\bold{Note:}$ Limbs are absent in snakes as well as in some lizards.

4. Tympanum is small and depressed.

5. Teeth are present in all reptiles except for tortoise and turtles.

6. Respiration is done through lungs; gills are not present (absent).

7. Heart is three chambered and is divided into two auricles and an incompletely divided ventricle.
$\bold{Note:}$ Only crocodiles have four chambered heart.

8. Terrestrial reptiles such as snakes and lizards excrete uric acid, hence, they are uricotelic animals.

9. Fertilisation is done internally.

10. Most reptiles are oviparous and lay their eggs with very tough covering and do not need to lay eggs under water. Few of them like lizards and snakes are viviparous. (There's no aquatic larval stage.)

$\large\bold{Example:}$ Lizards, snakes, crocodiles, tortoises, turtles etc.