Levels of OrganisationEdexcel IGCSE Biology: Flashcards
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What is the order of levels of organisation from smallest to largest?
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- What is the order of levels of organisation from smallest to largest?
- Organelles → cells → tissues → organs → systems.
- Define organelle.
- A structure within a cell that carries out a specific function, e.g. the nucleus or mitochondrion.
- Define cell.
- The basic structural and functional unit of all living organisms.
- Define tissue.
- A group of similar cells working together to perform a shared function.
- Define organ.
- A structure made of two or more tissues working together to perform a specific function.
- Define organ system.
- A group of organs working together to carry out a major body function.
- Name an example of an animal tissue.
- Muscle tissue (or epithelial, nervous, connective tissue).
- Name an example of a plant tissue.
- Xylem tissue (or phloem tissue).
- Give an example of an organ.
- The heart, the stomach, or a leaf.
- Give an example of an organ system.
- The digestive system, circulatory system, or respiratory system.
- Which tissues make up the heart?
- Muscle tissue, connective tissue and nervous tissue.
- Why is a single cell not classed as a tissue?
- A tissue must be made of many similar cells working together, not just one cell.