Question

What are characteristics of Platyhelminthes, coelenterate, Echinodermata, mammals, amphibians.

Answer 1

Hi friend,

Your answer:

1. Platyhelminthes (Planaria, Fasciola,etc) :-

i) Flattened dorso-ventrally forming ribbon like or leaf like body.
ii) Have organ system level of organization.
iii) Are usually endoparasites.
iv) Special cells called flame cells are present for excretion.
v) Are acoelomates ( without body cavity).

2. Coelenterate (Hydra, Aurelia, etc) :-

i) Sac-like animals having radially symmetrical body.
ii) Most are marine but few live in freshwater.
iii) Have special cells called stinging cells or nematoblasts.
iv) Have finger like structures called tentacles.
v) Have a continuous body cavity called coelenteron.
vi) Exhibit polymorphism.

3. Echinodermata (Starfish, antedon,etc) :-

i) Exclusively marine.
ii)Tube feet for locomotion.
iii) Have spines on the body surface.

4. Mammalia ( Humans, whale, rabbit, etc) :-

i) Presence of functional mammary glands.
ii) Presence of hair on any part of body.
iii) Heart is 4 chambered.
iv) Presence of external pinna.

5. Amphibia ( Rana, bufo, hyla, etc) :- 

i) Maybe aquatic, semi-aquatic or terrestrial.
ii) Respiration takes place through skin, lungs or lining of buccal cavity.
iii) Heart is 3 chambered.
iv) Oviparous.
v) Third eyelid called nictitaing membrane is present to clean the eyeballs.

Hope it helps!

Answer 2

Hello friend!
Here's ur answer!
The characteristics of platyhelminthes are:
These are small,soft, flattened, unsegmented worms without a body cavity.
The alimentary canal has only one opening, the mouth.
Most of the flatworms live on or inside other animals as parasites, but a few are free, living in the sea fresh water. Examples: parasites- liverfluke, Tapeworm; free living - planariam.
The characteristics of coelenterate/ chidarians are:
They have a two layered body wall which encloses a single gastrovascular cavity where digestion takes place.
The cavity opens by the mouth at one end only.
They have tentacles to catch food organisms.
They are found mostly in sea, very few in fresh water. Examples : hydra, jellyfish, sea anemone,corals.
The characteristics of Echinodermata are:
They are unsegmented, marine aninals.
They have an exoskeleton and a spiny surface.
They move by means of tube feet.
They are radially symmetrical ie.They have similar parts (usually five) arranged regularly around a central point. Examples : starfish, brittle star, sea urchin and sea cucumber.
The characteristics of mammals are:
They belong to the phylum chordata.
They possess a notochord which is a rod - like structure in the mid - dorsal axis of the body.
Except some animals, all others posses a backbone and are called vertebrates.
They are highly developed animals for life in land, although some of them, live in Water and air.
They give birth to young ones except Australian spiny ant- water and duck - billed platypus which lay eggs.
They suckle the young ones by mammary glands.
They have hair in their skin.
They are warm blooded.
They have a muscular diaphragm separating the thorax and abdomen internally.
They have a four chambered heart .
They have a pair of external ears and external testes.
They breathe by lungs.
They have two limbs. Examples: cat, for, humans, etc.
The characteristics of amphibians are:
They belong to the phylum chordata.
They possess a notochord which is a rod - like structure in the mid - dorsal axis of the body.
Except some animals, all others posses a backbone and are called vertebrates.
They have a three chambered heart.
They live partly on land and partly in water.
Their eggs are layer in water.
In early stages of life, they breathe by the means of gills.
Adults breathe mostly by lungs.
They have a smooth, non- scaly,moist, slimy skin.
The eardrum lies on the surface of skin.
They have five- fingered limbs.
They are cold- blooded. Examples : frog, road, salamander, newt .

Hope it helps!!☺
Thanks!!!☺