TOPIC 1 NUTRITION IN ANIMALS – Biology Notes Form Two New
Nutrition is the process by which organisms take in and use nutrients.
Nutrients are any substances that nourish an organism or are substances which organisms use for the body processes.
Food is any material when taken in absorbed and utilized meet requirement of plant and animal body.
FUNCTION OF FOOD
- Oxidized to release energy
- Used in growth of cells
- Used to repair lost cells and tissue
TYPES OF NUTRITION
There are two main types of nutrition:
- Autotrophic nutrition and
- Heterotrophic nutrition.
Autotrophic Nutrition
Autotrophic Nutrition is the process by which organisms manufacture their own food from simple inorganic substances like carbon and hydrogen using either light energy (photosynthesis) or chemical energy (chemosynthesis). Organisms which feed by this way are known as autotrophs; Example green plants, iron bacteria and sulphur bacteria
Heterotrophic Nutrition
Heterotrophic Nutrition is the process in which organisms get nutrients from other organisms, they feed on already manufactured/made food. Organisms which feed on this way are known as heterotrophs.
There are three types of heterotrophic nutrition.
- Saprophytic nutrition
- Symbiotic nutrition
- Holozoic nutrition
TOPIC 1 NUTRITION IN ANIMALS – Biology Notes Form Two New
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