Multiple choice

Lithotrophs are categorized into different physiological groups based on their inorganic substrate for energy production and growth. Which of the following ‘physiological group: energy source’ pair are not correct?

  1. Hydrogen bacteria: H2
  2. Methanogens: CH4
  3. Carboxydobacteria: CO
  4. Iron bacteria: Fe+++

  1. 1 and 2 only

  2. 1 and 3 only

  3. 2 and 3 only

  4. 2 and 4 only

  5. 3 and 4 only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The methanogens oxidizes H2 as a sole source of energy while transferring the electrons from H2 to CO2 in its reduction to methane. Iron bacteria oxidize Fe++ as energy source to Fe+++.

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