Question

general character of class amphibia

Answer 1

HEYA!

1. Amphibians live in both aquatic and terrestrial habitats
2. Body is divided into head and trunk.tail is absent.
3. Eggs → larva (aquatic) → adult (land and water)
4. They either have 2 pairs of limbs or no limbs.
5. Skin is smooth, moist and scale less ( ceacilian scales)
6. Possess complete digestive system
7. Respiration occurs through gills ( tadpole stage), skin, lungs
8. They have a closed circulatory system.their heart has three chambers.
9. Larvae excretes ammonia whereas adults excrete urea
10. They are unisexual and fertilization is external.
11. They have a pentaductile limb.
12. The amphibia class is further divided into 3 orders.,

• Apoda - ex= caecilian, blind worm
• Eurodela / cardata - ex= salamander, newts
• Anura - ex = frogs and toads

Answer 2

Amphibia : ( Amphi = both , Bios = life)

1) They are exclusively fresh water

animals.

2) They are carnivores.

3) They are poikilothermic .

4) External ear is absent.

5) Circulatory system is of closed

type.

6) Heart is three chambered.

7) RBCs are biconvex , nucleated.

8) Respiration is by skin , lungs ,

buccopharynx.

9) Nervous system is well developed.

10) Sexes are separate.

11 ) They are oviparous.

12) Fertilization is external.

13) They show metamorphism.