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CLASS: SS1
TOPIC: THE CELL
CONTENT:
Sub–Topic 1: CELL AS A LIVING UNIT
The cell is defined as the simplest, the smallest and basic unit of life. It is the structural and functional unit of a living organism. The cell can carry out all life activities such as feeding, respiration, movement etc.
Classification of Living Things Based on The Number of Cells
All living things are classified into two major groups depending on the number of cells they possess. These groups are:
Sub–Topic 2: FORMS IN WHICH LIVING CELLS EXIST
Living cells exist basically in four forms;
Paramecium is a fresh-water protozoan. It lives in ponds and puddles and feeds mainly on bacteria. It is often described as having a slipper shape and is about 0.25mm long. It has a stiff outer-covering called the pellicle which gives it a fixed shape. Its cytoplasm is divided into a clear outer layer called the ectoplasm and a granular inner layer called the endoplasm.
The endoplasm contains several food vacuoles, two contractile vacuoles and two nuclei. The larger one called the meganucleus and the smaller one the micronucleus. It moves (swims) in the water by means of cilia. The cilia are tiny projections of the ectoplasm through the pellicle. The oral groove and gullet are specialized for feeding, while the contractile vacuole is specialized for water regulation.
SUB-TOPIC 3: CELL STRUCTURE AND FUNCTIONS
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