Who this is for: Cambridge IGCSE Coordinated Science (0654) students who want cell structure — organelles and their functions — to become a reliable source of marks instead of a label-memory exercise.
What query it owns: how to understand and revise cell structure in Cambridge IGCSE Coordinated Science.
Why this is safe: this page owns the cell-structure revision-guide angle, while Tutopiya’s Cell Structure subtopic page owns the learning resource and the free Cell Structure quiz owns the practice.

Cells are the basic structural and functional units of life. Cambridge IGCSE Coordinated Science (0654) expects you to identify organelles, state their functions, and compare plant and animal cells — not just label diagrams. This guide links each structure to what it does biologically, so you can answer definition, comparison and function questions with confidence.

Key takeaways

• Every cell has a cell membrane, cytoplasm and genetic material (DNA in a nucleus for eukaryotes).
• Nucleus controls cell activities and contains genetic material.
• Mitochondria carry out aerobic respiration to release energy.
• Chloroplasts (plants only) carry out photosynthesis; contain chlorophyll.
• Cell wall (plants) made of cellulose gives support; vacuole (plants) maintains turgor.
• Ribosomes synthesise proteins; cell membrane controls entry and exit of substances.

What is cell structure in Cambridge IGCSE Coordinated Science?

Cell structure covers the parts of eukaryotic cells and what each organelle does. Animal and plant cells share many structures, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Understanding function — not just names — is what separates full marks from partial credit.

You can read the full explanation, labelled diagrams and notes on Tutopiya’s Cell Structure subtopic page before you attempt questions.

Core organelles and their functions

Organelle	Function	Found in
Nucleus	Controls cell activities; contains DNA/chromosomes	Plant and animal
Cell membrane	Controls entry and exit of substances	All cells
Cytoplasm	Jelly-like fluid where reactions occur	All cells
Mitochondria	Aerobic respiration; energy release	Plant and animal
Ribosomes	Protein synthesis	Plant and animal
Chloroplasts	Photosynthesis (contain chlorophyll)	Plant only
Cell wall	Support and protection (cellulose)	Plant only
Vacuole	Contains cell sap; maintains turgor	Plant (large); animal (small)

Plant vs animal cells — what examiners compare

Feature	Animal cell	Plant cell
Cell wall	Absent	Present (cellulose)
Chloroplasts	Absent	Present
Vacuole	Small / temporary	Large permanent vacuole
Nucleus	Present	Present
Mitochondria	Present	Present
Shape	Often irregular	Often regular (fixed by cell wall)

Cell structure in past-paper wording: command words that matter

Command word / phrase	What the question wants	Typical cell structure stem
State the function	Link organelle to role	”State the function of mitochondria.”
Identify	Name structure from description	”Name the organelle where photosynthesis occurs.”
Compare	Differences between cell types	”Compare a plant cell with an animal cell.”
Label	Name parts on a diagram	Diagram with arrows to organelles

Worked exam-style stems (how to answer the wording)

1. “State the function of the mitochondria.” Site of aerobic respiration / releases energy for the cell. Mark-scheme reward: respiration and energy both mentioned.
2. “Name two structures found in a plant cell but not in an animal cell.” Cell wall and chloroplasts (or large permanent vacuole). Reward: any two valid structures.
3. “The cell membrane is described as selectively permeable. Explain what this means.” It controls which substances enter and leave the cell. Reward: idea of control/selective passage.

Test yourself with the Cell Structure quiz once you can state functions without a diagram.

How cell structure connects to the rest of Coordinated Science biology

Cell structure builds on Characteristics of Living Organisms and leads into Movement In and Out of Cells — how substances cross the cell membrane. The Cambridge IGCSE Coordinated Science resource hub links every Cells subtopic.

Common mistakes students make

• Learning labels without linking them to functions.
• Saying the nucleus carries out respiration (that is mitochondria).
• Forgetting chloroplasts are plant-only.
• Confusing cell wall (plants) with cell membrane (all cells).
• Stating chloroplasts are for respiration (they are for photosynthesis).

When you need more support

If cell-structure questions keep costing marks, work through the Cell Structure quiz, then get focused help from a Cambridge IGCSE Coordinated Science tutor.

Frequently asked questions

Is cell structure hard in Coordinated Science? The organelle list is manageable if you learn function alongside name and practise plant vs animal comparisons.

What is the difference between cell wall and cell membrane? The cell membrane (all cells) controls entry and exit; the cellulose cell wall (plants only) provides support and protection.

Which organelle carries out photosynthesis? Chloroplasts — they contain chlorophyll and are found in plant cells only.

How do I revise cell structure effectively? Draw and label both cell types from memory, state each function, then take the Cell Structure quiz.

Ready to master Cambridge IGCSE Coordinated Science cell structure?

Start with the Cell Structure subtopic page, then book a free trial with a Cambridge IGCSE Coordinated Science specialist to turn organelle knowledge into guaranteed marks.

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