The process of intake and utilization of food by organisms is called nutrition. This is mainly of two types.

1. Autotrophic nutrition

2. Heterotrophic nutrition

1) Autotrophic nutrition : 

The mode of nutrition in which organisms make food by themselves is called autotrophic nutrition. 

Ex: 

Green plants 

2) Heterotrophic nutrition : 

The mode of nutrition in which organisms depend on other organisms for food is called Heterotrophic nutrition. 

This is again of three types 

i) Saprophytic nutrition: 

The mode of nutrition in which organisms take in nutrients in the form of solution from dead and decaying matter is called saprophyticnutrition. 

Ex:

 Certain microorganisms such as bacteria and fungi like mushrooms, bread mould etc. 

ii) Parasitic Nutrition : 

This type of association between two organisms for food in which one organism get benefited and other is vitiated is called parasitic nutrition. 

Ex: 

Cuscuta, Intestinal worms 

iii) Holozoic Nutrition : 

Holozoic Nutrition is the mode of heterotrophic nutrition in which the food is taken in solid or liquid form from the outside and is digested inside the body. 

Ex: 

Amoeba. Human beings