A Cell is a building block of life

There is a great variety of living things on our planet. Living material is called protoplasm that is not a chemical compound but a complex mixture varying in different organs and organisms. The amazing fact is that apart from viruses all living matter is made up from the same building blocks called cells. This was discovered by Robert Hooke in 1665 (Studying a piece of cork under a microscope he saw hundreds of little boxes).

A cell is a smallest unit of life. Sometimes one cell is one being as for Paramecium, a  unicellular that is  widespread in marine, brackish and freshwater environments.  Sometimes thousand trillions cells combine to form one organism that behaves as one unit.  And when a cell has grown to a characteristic size it divides and forms two cells. For a one-celled organism it is a process of reproduction. And for a multicellular copying of cells is only growth of organism and the process of reproduction is much more complex and is sexual or asexual.

In a multicellular organism large number of cells of the same type group to form tissue; tissues form organs. Thus different cells have different structure and are specialized to do a particular job they all have certain features in common. Cell contains organic molecules made mainly of carbon, nitrogen, hydrogen and oxygen. Substances constantly get into a cell and chemical processes take place.

Cells differ in shape and size. Different structures have animal and plant cells. Follow the link below to know more about an animal cell:

Cells: the building blocks of life

Try to produce your glog about a plant cell. Good luck!

Words to know:
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