Classifications of Organisms

Invertebrates

Vertebrates

Porifera

Fixed to Some object

Ex:- Sponge

Mostly Found in Seas

Body is Porous

Cnidaria

Aquatic Animals

Sac- like Body

Mouth surrounded by Finger like Projections

Ex:- Jellyfish Link Title)

Platyhelminthes

Body thin and flattened

Mostly live as parasites in other animals

Ex:- Tapeworm Link Title

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Nemadota

Body is rounded and unsegmented

Mostly live as parasites in humans

Ex:- Ascaris Link Title

Annelidia

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Body composed of rings or segment

They have soft, moist body wall through which they breathe

They have special organs for excretion called nephridia

Ex:- Earthworm

Arthropoda

Divided in 3 parts head, thorax and abdomen

Joined legs

Divided in 4 classes

Crustacea

Myriapoda

Insecta

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Archanida

Mollusca

Soft body not segmented

Body is enclosed in hard shell

Move with the help of muscular foot

Ex:- Octopus Link Title

Echinodermata

Body is rough

Mainly Marine

Have Tube Feet

Radically Symmetrical Bodies

Ex:- Starfish Link Title

Pisces

Fishes

Streamlined body

Body covered with scales

Breathe through gills

Ex:- Rohu

Amphibia

Can live in water and on land too

Lay their eggs in water

Body covered by a slimy and slippery skin

Ex: Frog and Toad

Reptilia

Mostly live in land, some love in water too

Skin is dry and scaly

Breathe through lungs

Females lay soft shelled eggs on land

Have four short legs for crawling on land

Ex:- Lizard

Aves

Birds

Body covered with feathers

Have wings to fly

Bones are hollow and light in weight

Legs bear scales and toes have claws

Jaws provided with horny beak but have no teeth

Females lay hard shelled eggs

Ex:- Pigeon

Mammalia

Body covered with hair

Possess projecting external ears

Give birth to young ones (babies)

Young ones suckle milk from mammary glands present in mothers

Usually have a tail (except humans) and four limbs

Ex:-- Humans