Define Nutrition in Biology

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


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).

Total Views: 968

Related FAQs

Q. How do guard cells regulate opening and closing of stomatal pores?

Ans: The opening and closing of stomatal pore is a function of guard cells. Stomata act as turgor operated valves. The guard cells are thicker on the inner side and thinneron the outer side. The guard cell... read more

Q. What is Photosynthesis ?

Ans: The process by which green plants make their own food from carbon dioxide and water by using sunlight energy in the presence of chlorophyll is called photosynthesis.... read more

Q. What are the various steps involved in the process of photosynthesis ?

Ans: 1. Absorption of sunlight energy by chlorophyll. 2. Conversion of light energy into chemical energy and splitting of water into hydrogen and oxygen by light energy. 3. Reduction of carbon dioxide by... read more

Q. Explain the process of nutrition in Amoeba.

Ans: Amoeba takes in food by forming temporary finger like projections called pseudopodia. The pseudopodia fuse over the food particle forming a food vacuole. The digestive enzymes from the surrounding cyt... read more

Q. What are the necessary conditions for autotrophic nutrition ?

Ans: Carbondioxide, water, chlorophyll and sunlight.... read more

Q. Explain the process by which autotrophs make their food and also write it's biochemical reaction.

Ans: Photosynthesis is the process by which autotrophs take in carbon dioxide from air and water from the soil, then converted into carbohydrate in the presence of sunlight and chlorophyll. Biochemical ... read more

Q. What are the raw material for photosynthesis and how are they helpful in photosynthesis?

Ans: 1. Carbon dioxide: Enters through stomata and acts as a source of carbon and oxygen in the formation of glucose. 2 Water : absorbed by roots, source of Hydrogen in the formation of glucose and also ... read more

Q. What is the site of photosynthesis?

Ans: Photosynthesis takes place in special organelles known as chloroplast containing a green pigment called chlorophyll.... read more