The parasite that is nonliving outside a living cell but becomes living on entering it
A
Bacterium
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B
Bacteriophage
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C
Plasmodium
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D
Yeast
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Solution
The correct option is B Bacteriophage
Bacteriophages are the types of viruses which attack on bacteria. Phages are non living entities which require a living host for completion of their life cycle. On entering the cells, they are considered as living. The bacteriophages enter into the specific bacteria, and causes infection by taking over the cell's machinery. When the life cycle gets completed, the phages lyse and kill the bacterial cells.
Thus, the correct answer is option 'Bacteriophage'.