What are cells ?

Did you know that you have seen cells many times? When a section ad an orange is broken open, the whole fibres that we see are cells. If the cell walls are broken, the juices will run out.

According to scientists, the cell is building block that makes up all living things. Everything that is alive is made up of one or more cells. Cells are also the units in which all life activities take place. Each cell in a plant or animal lives its own life and at the same time makes it possible for the living things as a whole to carry on its own life activities.

Living cells, both plant and animal, consists of a cell membrane, a mass of jelly-like colourless material called 'protoplasm', and a kernel-like part of the protoplasm called 'the nucleus'. It is the protoplasm which is the living matter.

In fact, this protoplasm is by far the most complicated chemical substances in existence. It carries on all processes necessary supplies to every one of their cells, the higher forms of living things have developed a circulatory system. This circulates food and oxygen to the cells and removes waste products,