this ppt will help you in your biology studies in microorganisms.this ppt gives u information about 4 types of microorganisms

2. What are microorganisms
A microorganism is a microscopic organism that comprises
either a single cell, or multicellular organisms. The study
of microorganisms is called microbiology, a subject that
began with Anton van Leeuwenhoek ‘s discovery of
microorganisms in 1675, using a microscope of his own
design.

3. Types of microorganisms
There are four different types of micro-organisms:
Bacteria
Fungi
Viruses
Algae

4. Viruses
 Viruses are too small to be seen by the naked eye. They can't
multiply on their own, so they have to invade a 'host' cell and take
over its machinery in order to be able to make more virus particles.
 Viruses consist of genetic materials (DNA or RNA) surrounded by
a protective coat of protein. They are capable of latching onto cells
and getting inside them.
 The cells of the mucous membranes, such as those lining the
respiratory passages that we breathe through, are particularly open
to virus attacks because they are not covered by protective skin.

5. Bacteria
 Bacteria are organisms made up of just one cell. They are capable of
multiplying by themselves, as they have the power to divide. Their
shapes vary, and doctors use these characteristics to separate them into
groups.
 Bacteria exist everywhere, inside and on our bodies. Most of them are
completely harmless and some of them are very useful.
 But some bacteria can cause diseases, either because they end up in the
wrong place in the body or simply because they are 'designed' to invade
us.

6. Algae
 Algae are a type of living thing that usually live in really wet
environments, like the ocean. They are a little bit like plants. They
take energy from the sun and use it to make food, just like plants
do! The difference between algae and plants, is that plants have a lot
more distinct parts, like roots, petals, stems, and leaves.

7. Fungi
 Fungi are like plants that are not "green"; they do not have the
photosynthetic pigment chlorophyll. They have no roots stems or leaves
but grow as masses of protoplasm in dead or living organic matter. There
are about 100,000 different fungi. Some like the yeasts are single cells
but most fungi grow as branching tubes of protoplasm called hyphae.
Fungi contain chitin which is also found in animal cells. A single organism
is called a fungus.