Autotrophic and Heterotrophic Nutrition:
The following are the points of difference between Autotrophic and Heterotrophic Nutrition-
|It is the mode of nutrition in all green plants, some bacteria and some protozoan animals (such as Euglena).
|It is the mode of nutrition in non-green plants and animals.
|This mode of nutrition is achieved by the process of photosynthesis.
|In this nutrition, organisms depend upon readymade food like carbohydrates and fats.
|It requires carbon dioxide (CO2) and water (H2O) as raw materials.
|No such raw materials are required.
|Most autotrophs possess chlorophyll.
|Chlorophyll is absent.
|A source of energy is required. It is mostly sunlight.
|A separate source of energy is not required. Energy is a component of organic food obtained from outside.
|It is independent and self-nourishing.
|It is totally dependent on autotrophic organisms for their nutrition.
|Autotrophs are placed at the primary level in the food chain and act as producers of food for the biosphere.
|Heterotrophs are placed in the secondary or tertiary level in the food chain and act as consumers of the biosphere.
|It maintains the O2-CO2 balance of nature.
|It has no role in O2-CO2 balance.
|The food is digested inside the cell.
|The digestion may occur inside the body organs.
|There are no processes like ingestion, digestion and egestion.
|There is ingestion, digestion and egestion.