Tag: o level revision notes

A pure substance is one that contains only one type of substance, i.e. only one type of atom or molecule.

A matter is any substance that has mass and occupies space. There are three states of matter: solid, liquid and gas. Most of the matters can exist in all three states.

The study of chemistry requires the measurement of various quantities, such as mass and volume

Reproduction is a characteristic of all living organisms. It is the process that makes more of the same kind of organism. Reproduction is essential in all species to ensure that the species does not extinct.

The human transport system is a system of tubes with a pump and valves to ensure one way blood flow. We need a transport system to deliver oxygen, nutrients and other substances to all our body cells, and take away waste products from them.

Animals eat to grow, repair etc. They simply eat to live. In this unit we will study how animals make use of what they eat.

We rarely think about breathing unless we’re out of breath. The act of breathing is part of the respiratory system, a complex process where air travels into and out of the lungs.

Just like humans, plants have a transport system of vessels and cells that transports water, minerals and other nutrients around the plant.

Plants are living organisms, they need food in order to keep living. The way they obtain their nutrients however, is completely different than that of ours. Plant make most of their nutrients by them selves, they just need 2 raw materials, these water and carbon dioxide.