IGCSE/GCSE Biology Edexcel Revision Notes PDF - Section 2 - level of organisation. Includes deatiled and comprehensive revision notes on the first topic from the Biology 9-1 Edexcel specification.
Levels of Organisation
● The organisation of tissues, organs and body system contributes to the 8 life processes
Cells and Organelles
An organelle is a structure within a cell that carries out a particular function such as a nucleus of a
vacuole.
Tissues
In multicellular organisms, most cells are specialised and are organised into tissues. A tissue is a
group of similar cells with the same function, such as muscle tissue.
Questions - page 31
1. Give two examples of organelles
2. a) Give two examples of tissues in the human body
b) Explain how they are adapted for their function
3. a) Give two examples of tissues in a plant
b) Explain how they are adapted for their function
Organs
Organs are structures within larger organisms that are adapted to do a specific function. They are
formed from different tissues that work together to carry out that function, such as the stomach or
heart.
Systems
Is a group of organs that work together to carry out a particular function, such as the mouth,
stomach and intestines in the digestive system.
Questions - page 33
1. Give two examples of organs in the human body and describe their function
2. Give two examples of organs in a plant and describe their function
3. Explain what we mean by a body system
End of topic questions - page 35
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