A) Viruses are obligate parasites
B) All fungi are pathogenic
C) All algae are eukaryotic
D) Bacteria are always harmful to mankind
Correct Answer: A
Solution :
Viruses are obligate parasites. As they have both living and non-living characters, so, they depend upon specific hosts for their reproduction and development. The cells of animals, plants and bacteria can serve as host to virus outside the host cells, viruses exist as individual particles called virions.
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