Organisation in Organisms — GCSE Biology Revision
Revise Organisation in Organisms for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Digestive SystemWhat is Organisation in Organisms?
Multicellular organisms have a hierarchical structure. Specialised cells group together to form tissues, different tissues work together to form organs, and organs are organised into organ systems, which all work together to make up the organism. This organisation allows for efficient functioning and division of labour within the body.
Board notes: A foundational concept covered by all major boards (AQA, Edexcel, OCR) that links cell biology to whole-organism biology.
Step-by-step explanationWorked example
The digestive system is an organ system. It includes organs like the stomach, small intestine, and liver. The stomach itself is an organ made of tissues like muscle tissue (to churn food) and glandular tissue (to produce digestive juices). These tissues are made of specialised cells.
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Common mistakes
- 1Getting the order of organisation wrong. Remember the sequence: Cells -> Tissues -> Organs -> Organ Systems -> Organism.
- 2Thinking an organ is made of only one type of tissue. Most organs, like the stomach, are made of several tissue types (muscular, glandular, epithelial) that work together.
- 3Confusing an organ with an organ system. The heart is an organ, but the circulatory system (heart, blood vessels, blood) is an organ system.
Organisation in Organisms exam questions
Exam-style questions for Organisation in Organisms with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Organisation in Organisms
Core concept
Multicellular organisms have a hierarchical structure. Specialised cells group together to form tissues, different tissues work together to form organs, and organs are organised into organ systems, wh…
Frequently asked questions
What is a tissue in biology?
A tissue is a group of similar cells that are specialised to perform a specific function. For example, muscle tissue is made of muscle cells that can contract.
Give an example of an organ system and its function.
The respiratory system is an organ system responsible for gas exchange. It includes the lungs, trachea, and diaphragm, which work together to take in oxygen and remove carbon dioxide.