Define Nutrition in Biology

Updated on Jan. 8, 2021 03:24 PM IST by Lakshmi Arya

Nutrition:-

It is a process by which living organisms obtain food or synthesize it  for growth, repair, maintenance and reproduction and for meeting the energy needs.

Modes of Nutrition:-

  1. Autotrophic Nutrition:- In this type of Nutrition an organism makes his own food from simple inorganic materials (CO2 and H2O). These organisms are called the autotrophs, include green plants and some bacteria.
  2. Heterotrophic Nutrition:- In this type of Nutrition organism derive energy from the intake and digestion of the organic substances prepared by autotrophs and other organic sources. These organisms are called the heterotrophs, include animals and fungi.

Types of Heterotrophic Nutrition:-

  1. Saprophytic Nutrition: Organisms feed on dead decaying plants or animal materials. The organism takes nutrients in solution from dead and decaying matter.Example: Mushroom, Yeast and some fungi(bread moulds).
  2. Holozoic Nutrition: Organisms (mostly animals) take in whole food and then digest it into smaller particles with enzyme inside their bodies.
  3. Parasitic Nutrition: Organisms obtain food from the body of another living organism (host) without killing them.

Endoparasite - Parasite live inside the body of the host. Example: tapeworm, roundworm .
Exoparasite - Parasite live on the body of the host. Example: lice,leech,cuscuta(amar- bel).

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