Types of bacteria

 TYPE OF BACTERIA 

 Bacteria are primary decomposers

organic material. They utilize soluble

food.

 Bacteria require energy and material

for growth and reproduction.

 Energy for bacteria is derived from bio-

chemical oxidation or reduction of

inorganic or organic compounds.

 Material is derived from inorganic and

organic compounds.

Bacteria are classified according to the 

energy or material source they require. 

Autotrophs:

 They derive both enough 

energy and material from inorganic 

substance. 

Heterotrophs :

 They derive both energy 

and material from organic compounds. 

Phototrophs :

 Utilise sunlight as energy 

source and inorganic substances for 

material sources. 

Heterotrophic bacteria are the most 

important species in the degradation of 

organic matter. 

Aerobic hetrotrophs: 

Aerobic bacteria (normally called) utilizes organics in the presences of oxygen. 

Anaerobic hetrotrophs: 

Anaerobic bacteria utilizes organic in the absence of oxygen. 

Facultative hetrotrophs:

 Facultative bacteria is capable of functioning both in presence as well as absence of oxygen.