Question

The most abundant prokaryotes helpful to human 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

Correct Option (d) heterotrophic bacteria

Explanation:

Heterotrophic bacteria are most abundant m nature. Many of them have a significant impact on human affairs. These are helpful in making curd from milk (e.g. Lactobacillus sp.), production of antibiotics (e.g. Streptomyces sp.) and fixing nitrogen in legume roots (e.g. Rhizobium sp).