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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
Nostoc
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B
Bacillus
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C
Pseudomonas
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D
Mycoplasma
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Solution

The correct option is D Mycoplasma
Mycoplasma is the smallest cell which does not possess cell wall as an outer covering but has cell membrane as an outer covering. As they do not have cell wall they do not get affected by the antibiotics and causes severe diseases to the plants and animals.

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