A microorganism or microbe is a
microscopic organism, which may be a
single cell or multicellular organism. The
study of microorganisms is called
A disease is an abnormal condition that affects the
body of an organism. It is often construed as a
medical condition associated with specific signs.
It may be caused by factors originally from an
external source, such as infectious disease, or it
may be caused by pain, dysfunction, distress,
social problems, or death to the person afflicted, or
similar problems for those in contact with the
person. In this broader sense, it sometimes
includes injuries, disabilities, disorders
bacteria are very small living cells with no
nucleus. They come in various shapes
viruses are not cells, they just reproduce
inside other living cells. They can take
over a cell and make it produce more
moulds are made up of lots of tiny threads
which grow over and inside their food.
Moulds feed on dead things. They
reproduce by releasing spores into the
Not all microbes turn food into
nasty substances, but the result
may be pleasant. Like cheese
Diseases occurs when harmful microbes
enter in our body. Such diseases are
Defence against disease
Dead and weakened microbes are
injected into the body.tis is called
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