There are two methods of nutrition in uni-cellular animals: -
Holozoic Nutrition: -
Some unicellular animals take in solid particles of food materials called holozoic
feeders. And this nutrition is called holozoic nutrition.
Saprozoic Nutrition: -
Some unicellular animals absorb liquid organic materials called saprozoic
feeders. And this nutrition is called saprozoic nutrition.
There are six methods of nutrition in multicellular organisms: -
Herbivores: -
These animals feed on plants e.g. cow, buffalo, goat, zebra etc. These animals
have strong teeth. They gulp food quickly and store food in stomach. The partly digested food is brought back into mouth for further mastication. This is called
regurgitation.
Carnivores: -
These are the flesh eating animals. E.g. cat, dog, lion and tiger etc. They have
sharp and pointed teeth and nail. They help them to tear and grasp prey.
Omnivores: -
These animals eat plants as well as other animals. E.g. Mat, bear, crow etc.
Frugivores: -
These animals eat seed and fruits. E.g. parrot and squirrel.
Insectivores: -
These animals eat insects e.g. frog, lizard etc.
Parasites: -
These animals gets their food from living host e.g. some worms. These are of
two types: -
i) Ecto-parasites obtain their food by living on the body surface of host.
ii) Endo-parasites obtain their food by living inside the body of host.