Biology Form 4 : Notes
O Level Notes : Biology - Reproduction
Reproduction is a characteristic of all living organisms. It is the process that...
O Level Notes : Biology - Transport In Humans
The human transport system is a system of tubes with a pump and valves to ensure...
O Level Notes : Biology - Animal Nutrition
Animals eat to grow, repair etc. They simply eat to live. In this unit we will study...
O Level Notes : Biology - The Respiratory System
We rarely think about breathing unless we’re out of breath. The act of breathing...
O Level Notes : Biology - Transport In Plants
Just like humans, plants have a transport system of vessels and cells that transports...
O Level Notes : Biology - Nutrition In Plants
Plants are living organisms, they need food in order to keep living. The way they...
O Level Notes : Biology - Animal Receptor Organs
Sense organs are the organs through which we sense or detect changes in the external...
O Level Notes : Biology - Drugs
A drug is any externally administered chemical substance (other than food) that...
O Level Notes : Biology - Excretion
Excretion is the process by which metabolic waste products and toxic materials are...
O Level Notes : Biology - Microorganisms And Their Application...
There are three types of microorganisms : viruses, bacteria and certain fungi.
O Level Notes : Biology - Hormones
Hormones greatly influence growth, development and activity of an organism. For...
O Level Notes : Biology - Homeostasis
Homeostasis is the process of keeping the composition of the body fluids within...
O Level Notes : Biology - Nutrients In Food
Living organisms require food to provide them energy for the vital activities of...
O Level Notes : Biology - Enzymes
Enzymes are biological catalysts made of protein. They alter the rate of chemical...
O Level Notes : Biology - Diffusion and Osmosis
Diffusion is the net movement of molecules or ions from where they are in a higher...
O Level Notes : Biology - Cells: The Building Blocks Of...
A cell is a basic unit of life. It consists of a mass of living matter called protoplasm.