______ bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for ATP production. They play an important role in recycling of nutrients (N,P,Fe,S etc).

Options

A. Photosynthetic autotrophic
B. Chemosynthetic autotrophic
C. Parasitic
D. Saprophytic

Answer

B

Explanation

Chemoautotrophic bacteria or chemosynthetic autotrophic bacteria are able to manufacture their organic food from inorganic raw materials with the help of energy derived from exergonic chemical reactions involving oxidation of an inorganic substance present in the external medium.