CBSE Class 7 Answered
Autotrophic Nutrition |
Heterotrophic Nutrition |
The organism prepares its food from simple substances present in the surroundings |
The organism obtains food from digesting organic compounds. |
Autotrophic nutrition is mainly of two types -photoautotrophic and chemo autotrophic nutrition. |
Heterotrophic nutrition may be holozoic, saprozoic, parasitic, etc. |
Autotrophs depend directly on solar energy |
Heterotrophs depend indirectly on solar energy. |
CO2 is taken in and O2 is released |
Food is taken into body and undigested food is released outside of the body. |
Holozoic nutrition is the process of obtaining nourishment by the ingestion of complex organic material, which is then digestde and absorbed.
In this nutrition, parts of plants or animals or an organism as a whole is ingested and then digested. Here, animals take the energy containing organic materials, called food, into the gut. After digestion, this food can be absorbed into the body. When this food is decomposed in oxidation reactions, it can release energy to supply for daily uses.
5. The mode of nutrition in which an organism obtains nutrients from dead and decaying organic matter is called saprophytic nutrition. Example - Rhizopus (bread mould), Mucor (pin mould), Yeast, Agaricus (mushroom) .