Question

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

• A. Cyanobacteria
• B. Archaebacteria
• C. Chemosynthetic autotrophs
• D. Heterotrophic bacteria

Answer 1

The correct option is D Heterotrophic bacteria

Heterotrophic bacteria require an organic carbon source for growth (i.e., they derive energy and carbon from organic compounds). Economically important uses of heterotrophic bacteria are:

1. They enhance the fertility of the soil by nitrogen fixation.
2. Production of curd and yogurt from milk, cheese, butter, wine
3. Production of antibiotics
4. They form an essential part of biogeochemical cycles during which they release essential elements, such as nitrogen and carbon for recycling.
5. Cleaning of oil spills

So answer is - 'Heterotrophic bacteria'.