SOME PROPERTIES AND FUNCTION OF THE CELL
Nutrition is defined as the process by which living organisms obtain and utilize
food materials from external environment for metabolic activities such as
respiration, growth, excretion and reproduction.
Food is any substance which when absorbed into the body cells yields energy and
materials for growth, repairs of damaged tissues and regulation of body processes
without harming the living organism.
Anabolism is defined as the synthesis of complex organic compound from simple
substances. Living things require food nutrients (carbohydrate, protein, lipids,
mineral salt,vitamins and water) for the following activities
i. Production of new protoplasm
ii. Growth.
iii. Repair of body cells and tissues.
iv. Production of energy for life activities.
Types of Nutrition
1.Autotrophic Nutrition is the type of nutrition in which organisms are able to
manufacture their own food. organism which can manufacture or synthesize their
own food are called autotrophs. Autotrophic mode of nutrition is carried out by
green plants through the process of photosynthesis and some certain bacteria
through the process of chemosynthesis..
i. Photosynthetic (Holophytic) Nutrition is the process where green plants
manufacture their own organic food from simple inorganic substances such as
carbondioxide, water, sunlight and chlorophyll with the release of oxygen as by-
product.
6CO2+6H20 Sunlight energy C6H12O6+6CO2
Chlorophyll
ii. Chemosynthetic Nutrition: is a process where certain bacteria which are
autotrophic manufacture their own food through simple inorganic substances such
as carbon (iv) oxide, water, hydrogen sulphide by using the chemical energy
released during the process as source of energy.
These bacteria do not depend upon sunlight energy. They have enzyme system
capable of trapping chemical energy.
Nutrition is defined as the process by which living organisms obtain and utilize
food materials from external environment for metabolic activities such as
respiration, growth, excretion and reproduction.
Food is any substance which when absorbed into the body cells yields energy and
materials for growth, repairs of damaged tissues and regulation of body processes
without harming the living organism.
Anabolism is defined as the synthesis of complex organic compound from simple
substances. Living things require food nutrients (carbohydrate, protein, lipids,
mineral salt,vitamins and water) for the following activities
i. Production of new protoplasm
ii. Growth.
iii. Repair of body cells and tissues.
iv. Production of energy for life activities.
Types of Nutrition
1.Autotrophic Nutrition is the type of nutrition in which organisms are able to
manufacture their own food. organism which can manufacture or synthesize their
own food are called autotrophs. Autotrophic mode of nutrition is carried out by
green plants through the process of photosynthesis and some certain bacteria
through the process of chemosynthesis..
i. Photosynthetic (Holophytic) Nutrition is the process where green plants
manufacture their own organic food from simple inorganic substances such as
carbondioxide, water, sunlight and chlorophyll with the release of oxygen as by-
product.
6CO2+6H20 Sunlight energy C6H12O6+6CO2
Chlorophyll
ii. Chemosynthetic Nutrition: is a process where certain bacteria which are
autotrophic manufacture their own food through simple inorganic substances such
as carbon (iv) oxide, water, hydrogen sulphide by using the chemical energy
released during the process as source of energy.
These bacteria do not depend upon sunlight energy. They have enzyme system
capable of trapping chemical energy.
