Biologu Class 11 notes chapter 12 Nutrition, definition, short question, long question, mcqs, for aindh board Pdf Download.
0.1 What is Nutrition?
Ans. Definition: “The process of acquiring energy and materials for cell metabolism is known as nutrition”. (OR) “The process of taking of nutrients and assimilating and utilizing them for maintenance of life, growth and repair of cells is called nutrition.”
All living organisms work like machine, so continuous supply of energy is essential for working.
This energy is obtained from nutrients of food etc.
Q.2 What are nutrients?
Ans. Nutrients are components of food. These components are carbohydrates, proteins and fats etc. These provide energy. They are used as raw material for the synthesis of protoplasm (cytoplasm + nucleoplasm).
The other nutrients such as water, electrolytes, minerals and vitamins are also essential to metabolic process or metabolism. (making + breaking of molecules).
Q.3 Describe autotrophic and heterotrophic methods of nutrition.
Ans. On the basis of nutrition, animals are divided into two catagories (classes):
- (i) Autotroph (or) Autotrophic organism
- (ii) Heterotroph (or) Heterotrophic organism
(i) Autotrophic
(Auto-self, troph=nourishing)
Autotrophs (or) Autotrophic organisms have ability to produce their organic food (carbohydrates, lipids and proteins) from inorganic molecules (CO2 and H2O) Plants are an example of autotrophic organisms. They use CO2 and H2O as raw materials. They take their raw material from surroundings or environment.
