What are Cells?

Did you know that you have seen cells many times? When a section of an orange is broken open, the whole fibres that we see are cells. If the cells walls are broken, the juices will run out. According to scientists, the cells is the building block that makes up all living thing.

Everything that is alive is made up of one or more cells. Cells are so 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 life activities.

Living cells, both plant and animal consists of a cell wall, a mass of jelly-like colorless 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, protoplasm is by far the most complicated chemical substance in existence. It carries on all the processes necessary for life. It takes in food and oxygen, changes some of the food into living matter, gives off waste, repairs its worn-out parts, and reproduces itself.

Each cell needs food and oxygen. To do work it must have energy. To carry the 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.  

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