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B
photoheterotrophs
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C
chemoautotrophs
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D
chemoheterotrophs
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Solution
The correct option is D chemoheterotrophs
Nitrifying bacteria are chemoautotrophs. They utilise inorganic molecules as source of energy instead of sunlight to synthesise complex organic molecules.
Photoautotrophs convert simple inorganic molecules into complex organic compounds in the presence of sunlight. Eg., All plants and photosynthetic bacteria.
Photoheterotrophs can utilise light as a source of energy but require organic carbon sources. Eg. Green and purple bacteria.
Chemoheterotrophs use chemical molecules as source of energy and need organic carbon sources. Eg, most of the pathogenic bacteria.