Question

Enumerate the main characteristics features of class amphibia.Why do amphibians lead dual life.

Answer 1

Hi mate.


Thanks for asking this question.


Here is your answer,




$amphibian \: \%$


(1) Amphibians are originated during Devanion

period in Paleozoic era.



(2) They are aquatic and terrestrial.



(3) Soft, moist and glandular pigmented body

skin is found.



(4) Body is divided into head and trunk but in

some cases tail is present.



(5) Eyelids are present on the eye.



(6) Respiration may be takes place by the body

skin or lungs or gills in their larva stage.



(7) Heart is three chambered i. e two auricles

and a ventricle.



(8) Renal portal system and heapatic portal

system are well developed.



(9) Erythrocyte are enlargement and

nucleated.



(10) Excretory organ is Meta Nephris in kidney.



(11) Excretory products are urea or ammonia.

So they are uriotelic animals.



(12) Metamorphosis is held in the larva stage to

change into the aquatic.



(13) Reproduction are external and copulatory

( sex organs) organs are absent.



(14) Gamets are fused outside the body in

water i. e external fertilization.



(15) Homodent teeth are present in upper jaw

or in both jaws.








Thank you.






BE BRAINLY !!!!!!!!!!!!!

Answer 2

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┗─━─━─━─━∞◆∞━─━─━─━─┛

➧ Subphylum Vertebrate divided into Five Classes:-
▬▬▬▬▬▬▬▬▬▬▬▬▬⤵

❶❭ Class Pisces:-
━━━━━━━━━━━━━━━━━━☟

❱ These are cold blooded.

❱ These are exclusively aquatic invertebrates.

❱ Body is streamlined.

❱ They have one pair of pectoral & pelvic fins.

❱ Respiration by 5 pairs of gills.

❱ Heart is two chambered.

❱ Skin is slimmy & covered with scales.

►Examples:- Electric Rays & DogFish
                                             
➧ Types 0f Class Pisces are:-
▬▬▬▬▬▬▬▬▬▬▬▬▬⤵

➀❭ Cartilaginous Fishes:-
━━━━━━━━━━━━━━━━━━☟

◉ Mouth is ventral.
◉ It is totally marine.
◉ Tail is heterocercal.
◉ Endoskeleton is Cartilaginous.

②❭ Bony Fishes:-
━━━━━━━━━━━━━━━━━━☟

◉ Mouth is trrminal.
◉ It is freshwater.
◉ Tail is homocercal.
◉ Endoskeleton is Bony.

❷❭ Class Amphibia:-
━━━━━━━━━━━━━━━━━━☟

❱ They are cold blooded animals.

❱ Body divided into head, trunk & Tail.

❱ Heart is three - Chambers.

❱ Fertilization is external & lay eggs.

❱ Respiration through gills, lungs & skin.

❱ They undergo hibernation & aestivation.

❱ Embryonic membrane is absent.

❱ Skin is a smooth & moist.

►Examples:- Seahorse & Catla

❸❭ Class Reptilia:-
━━━━━━━━━━━━━━━━━━☟

❱ They are cold blooded animals.

❱ Body divided into head, neck, trunk and tail.

❱ Heart is incompletely four chambered.

❱ Fertilization is internal.

❱ Respiration through gills.

❱ It is the first Terrestrial vertebrates.

❱ Embryonic  membrane is present.

❱ Skin is rough & dry.

►Examples:- Frogs & Toads
                                             
❹❭ Class Aves:-
━━━━━━━━━━━━━━━━━━☟

❱ These are warm blooded.

❱ Feathers are present on the body.

❱ Respiration by lungs with air sacs.

❱ Mammary gland is absent.

❱ They are 0viparous. Beek present.

❱ Bones are flight.

❱ Sweat & oil gland is absent.

❱ External ear is absent.

►Examples:- Crows & Parrots
                                             
❺❭ Class Mammalia:-
━━━━━━━━━━━━━━━━━━☟

❱ They are also warm blooded.

❱ Body covered with hair.

❱ Respiration by lungs without air sacs.

❱ Mammary gland is present.

❱ Teeth are present.

❱ Sweet and all gland is present.

❱ Solid bones are present.

❱ Heart is four chamber.

❱ External ears are present.

►Examples:- Humans & Rabbits

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