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Nutrition
Modes of Nutrition
1. Autotrophic Nutrition 2. Heterotrophic Nutrition
Difference between the two modes of Nutrition
|
Autotrophic Nutrition |
Heterotrophic Nutrition |
1 |
It occurs in green plants, some bacteria and in some plants. |
It occurs in fungi and animals |
2 |
Chlorophyll is necessary for trapping solar energy. |
Chlorophyll is absent; as such they do not trap solar energy. |
3 |
Food is self manufactured using CO2 and water as raw material |
Food is obtained directly or indirectly from autotrophs. |
4 |
Digestion of food does not occur. |
Digestion is required to convert complex organic substances into simpler form |
5 |
They are placed at the bottom of the food chain as producers. |
They are placed above producers in the middle of food chain as consumers. |
6 |
e.g.: plants, blue – green algae |
e.g.; animals including humans |
NOTE: Autotrophs and heterotrophs differ in how they obtain their carbon.
Autotrophs are organisms that can produce their own food from the substanc.es available in their surroundings using light (photosynthesis) or chemical energy (chemosynthesis).
Heterotrophs cannot synthesize their own food and rely on other organisms, both plants and animals for nutrition. Technically, the definition is that autotrophs obtain carbon from inorganic sources like carbon dioxide (CO2) while heterotrophs get their reduced carbon from other organisms. Autotrophs are usually plants; they are also called "self feeders" or "primary producers".