Bacteria are useful to humans and other organisms because they:
I Can be used to prepare antibiotics
II Are useful in agriculture for increasing soil fertility
III Can help in the digestion of food in herbivores

I only

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I and II only

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II and III only

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I, II and III

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Solution

The correct option is D I, II and III
Bacteria such as streptomycin is used as antibiotic to treat many disease.
Various bacteria are subjected to organic wastes to produce manure and biogas, which are used in agriculture for increasing soil fertility.
Bacteria is also present in intestines of herbivores such as cow and buffalo to help in digestion of cellulose.
Thus Option D is correct. All statement are correct.

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