Question

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

(a) Pseudomonas

(b) Mycoplasma

(c) Nostoc

(d) Bacillus

Answer 1

Ans: (b) Mycoplasma

Sol: Mycoplasmas are the smallest living cells, known without a definite cell wall. They are pathogenic to both plants and animals and can survive without oxygen.