1. Autotrophic nutrition can be divided into 2 :
a. Chemosynthesis :
*Synthesising organic compounds by using energy from the oxidation of inorganic chemical substances such as carbon dioxide, hydrogen sulphide, nitrogen or ammonia.
Examples of chemoautotroph are : sulphur bacteria which oxidises sulphur to sulphate and Nitrosomones sp. which oxidises ammonium to nitrite.
b.Photosynthesis :
*Synthesising organic compounds from carbon dioxide and water in the presence of sunlight . All green plants carry out photosynthesis.
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