Revision Topic: biology revision notes

Biology Form 4

IGCSE NOTES : Biology - The Alimentary canal

Ingestion is the taking of substances such as food and drink into the body through...

Biology Form 4

IGCSE NOTES : Biology - Human nutrition and Diet

All living organisms need food. An important difference between plants and animals...

Biology Form 4

IGCSE NOTES : Biology - Leaf structure

The relationship between a leaf and the rest of the plant is described in other...

Biology Form 4

IGCSE NOTES : Biology - The process of photosynthesis

Although the details of photosynthesis vary in different plants, the hypothesis...

Biology Form 4

IGCSE NOTES : Biology - Plant nutrition and Photosynthesis

Photosynthesis is the process by which plants manufacture carbohydrates from raw...

Biology Form 4

IGCSE NOTES : Biology - Biological molecules

A catalyst is a substance that increases the rate of a chemical reaction and is...

Biology Form 4

IGCSE NOTES : Biology - Structure of DNA and Water

A DNA molecule is made up of long chains of nucleotides, formed into two strands....

Biology Form 4

IGCSE NOTES : Biology - Biological molecules

The chemical elements that make up carbohydrates, fats and proteins. The sub-units...

Biology Form 4

IGCSE NOTES : Biology - Osmosis

If a dilute solution is separated from a concentrated solution by a partially permeable...

Biology Form 4

IGCSE NOTES : Biology - Movement in and out of cells

Cells need food materials which they can oxidise for energy or use to build up their...

Biology Form 4

IGCSE NOTES : Biology - Cell structure and organisation

If a very thin slice of a plant stem is cut and studied under a microscope, it can...

Biology Form 4

IGCSE NOTES : Biology - The plant kingdom

It is useful to have an overview of the classification of the plant kingdom, although...

Biology Form 4

IGCSE NOTES : Biology - The animal kingdom

Animals are multicellular organisms whose cells have no cell walls or chloroplasts....

Biology Form 4

IGCSE NOTES : Biology - Characteristics and classification...

All living organisms, whether they are single celled or multicellular, plants or...