On the Basis of Nutrition, Photoautotrophs, Chemoautotrophs, Photoheterotrophs, Chemoheterotrophs

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On the Basis of Nutrition

Micro-organisms can be classified into four categories on the basis of their mode of nutrition. These categories are:

(i) Photoautotrophs;

(ii) Chemoautotrophs;

(iii) Photoheterotrophs;

(iv) Chemoheterotrophs.

Photoautotrophs are those that use light-energy to manufacture (synthesize) their food; Photosynthetic micro algae, cyanobacteria and photosynthetic bacteria are the examples.

Chemoautotrophs are those that use chemical-energy to manufacture their food; the group consists of only bacteria like sulphur bacteria, iron bacteria, nitrifying bacteria etc, Photoheterotrophs are the micro-organisms that use light-energy in obtainment (absorption) of their food from external environment; purple non-sulphur bacteria are examples.

Chemoheterotrophs (saprophytic bacteria, symbiotic bacteria, microfungi, protozoa and colourless microalgae) are those that use chemical-energy in obtainment (absorption) of their food from external environment.

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