Question

Which of the following statements regarding micro-organisms is/are correct?

• A. The free-living bacterium {Wolbachia} is a human parasite.
• B. {Myxococcus} are a group of predatory bacteria.
• C. {Dictyostelium} is a slime mold that aggregates to form social groups.
• D. Actinomycetes in soil are involved in producing earthy odours.

Hint:

{Myxococcus} and {Dictyostelium} are well-known for their unique predatory and social behavior, respectively. Actinomycetes contribute to the distinctive earthy smell often noticed in soil.

Answer 1

The Correct Option is B, C, D

Let's review each statement: 
- Option (A): {Wolbachia} is not a free-living bacterium, nor is it a human parasite. {Wolbachia} is an intracellular parasite that affects a variety of invertebrates, not humans. Therefore, Option (A) is incorrect.
- Option (B): {Myxococcus} is indeed a group of predatory bacteria. They are known for their hunting behavior, where they form fruiting bodies and prey on other microorganisms. Therefore, Option (B) is correct.
- Option (C): {Dictyostelium} is a slime mold that aggregates to form social groups when food is scarce, and they show social behavior during their life cycle. Therefore, Option (C) is correct.
- Option (D): Actinomycetes in the soil are responsible for producing the earthy odor, and they play a key role in decomposing organic matter. Therefore, Option (D) is correct.
Thus, the correct answer is (B), (C), (D).