Question

Viruses are also microscopic but are
different from other microorganisms.
They, however, reproduce only inside the
cells of the host organism, which may be
a bacterium, plant or animal. Some of the
viruses are shown in Fig. 2.5. Common
ailments like cold, influenza (flu) and
most coughs are caused by viruses
Serious diseases like polio and chicken
pox are also caused by viruses.​

Answer 1

Answer:

Virus is a pathogenic microscopic organism. Viruses cannot multiply on their own, so they have to invade a 'host' cell. Pathogenic fungi are yeasts and moulds which can infect humans. Parasites are organisms that live on other organisms.

Explanation:

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