Write 10 lines on the usefulness of microorganisms in our lives.

Answer: Microorganisms are useful to us in many ways. For example, *Bacteria like Lactobacillus convert milk into curd. *Bacteria are also involved in the making of cheese. *Acetobacter aceti is used for producing acetic acid from alcohol. *Yeast is used in the commercial production of alcohol, wine and bakery products. *Some specific microorganisms are helpful in manufacturing of antibiotics. *Microorganisms act as cleansing agents and decompose the waste products into manure. *Dead or weakened microbes are used in the preparation of vaccines. *Some bacteria fix atmospheric nitrogen and increase soil fertility. Algae, yeast, fungi or bacteria may be used as an ingredient or a substitute for protein-rich foods that are suitable for human or animal consumption. Some microorganisms are taken as probiotics, that are believed to provide health benefits when consumed.