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 ?

(1) Pseudomonas

(2) Mycoplasma

(3) Nostoc

(4) Bacillus

Answer 1

The correct answer is (2)

Mycoplasmas are smallest, prokaryotes lacking cell wall and are pleomorphic in nature. These are pathogenic to both plants and animals.