Who this is for: Cambridge IGCSE Biology (0610) students who can label a cell diagram but lose marks when questions ask them to state the function of an organelle, compare animal and plant cells or describe what they see under a microscope.
What query it owns: how to understand cell structure and organisation in Cambridge IGCSE Biology.
Why this is safe: this page owns the revision-guide angle, while Tutopiya’s Cell Structure and Organisation subtopic page owns the learning resource and the free Cell Structure quiz owns the practice.

Cell structure and organisation is the gateway to the whole Organisation of the Organism topic in Cambridge IGCSE Biology (0610). Examiners expect you to identify organelles in animal and plant cells, state their functions and compare the two cell types. This guide explains the core structures, exam command words, and where to practise.

Key takeaways

• Animal and plant cells share nucleus, cytoplasm, cell membrane, mitochondria and ribosomes.
• Plant cells only have cell wall, chloroplasts and a large permanent vacuole.
• State wants function or name; describe wants what you see; compare wants both similarities and differences.
• Link each organelle to its function, not just its label — mark schemes reward “mitochondria release energy in respiration”.

What is cell structure and organisation in Cambridge IGCSE Biology?

Cell structure and organisation covers the parts of animal and plant cells and what each part does. The nucleus controls the cell; mitochondria release energy through respiration; chloroplasts (plants only) carry out photosynthesis; the cell membrane controls what enters and leaves. Cambridge IGCSE Biology (0610) tests identification from diagrams and functions in written answers.

Read the full notes on Tutopiya’s Cell Structure and Organisation subtopic page before you attempt questions.

The organelles you must master

Organelle	Function	Found in
Nucleus	Contains genetic material; controls cell activities	Animal and plant
Mitochondria	Aerobic respiration; releases energy	Animal and plant
Chloroplasts	Photosynthesis; contain chlorophyll	Plant only
Cell wall	Supports and strengthens the cell	Plant only (cellulose)
Cell membrane	Controls entry and exit of substances	Animal and plant
Vacuole	Stores cell sap; maintains turgor	Large in plant cells
Ribosomes	Protein synthesis	Animal and plant

How to answer cell structure questions — step by step

1. Identify the cell type — plant (cell wall present) or animal.
2. Name the organelle the question targets.
3. State its function using syllabus vocabulary.
4. For compare, list shared structures first, then plant-only features.
5. For describe, refer to the diagram — position, shape, relative size.
6. Check you have linked structure to function, not just labelled.

Test yourself with the free Cell Structure quiz once you have worked through the organelle table.

Animal vs plant: which approach does the question want?

Situation	What to do	Typical signal words
Label a diagram	Name structures A, B, C	”Name the structure labelled X”
State a function	One organelle, one role	”State the function of the mitochondria”
Compare cell types	Shared + different features	”Compare animal and plant cells”
Identify from description	Match function to organelle	”Which organelle carries out photosynthesis?”

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

Command word / phrase	What the question wants	Typical cell structure stem
State / Name	Short answer — name or function	”State the function of the nucleus.”
Describe	What is visible on the diagram	”Describe the appearance of the chloroplast.”
Compare	Similarities and differences	”Compare a root hair cell and a palisade cell.”
Explain	Why a structure is needed	”Explain why plant cells have a cell wall.”
Suggest	Apply to an unfamiliar cell	”Suggest which organelle is abundant in muscle cells.”

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

1. “State the function of mitochondria.” Site of aerobic respiration / releases energy for the cell. Reward: respiration or energy release.
2. “Compare animal and plant cells.” Both have nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells also have cell wall, chloroplasts and a large vacuole. Reward: at least two shared + two different.
3. “Explain why root hair cells do not contain chloroplasts.” Roots are underground and do not receive light, so photosynthesis cannot occur. Reward: link to absence of light.
4. “Suggest which organelle would be most numerous in a muscle cell.” Mitochondria — muscle cells need large amounts of energy for contraction, and mitochondria carry out aerobic respiration. Reward: organelle linked to energy demand.

Specialised cells are a favourite Paper 2 angle: palisade mesophyll cells are packed with chloroplasts for photosynthesis; red blood cells have no nucleus to carry more haemoglobin; sperm cells have a flagellum for movement. Whenever a question names a cell type, match its abundance of organelles to its function before you write.

Work the full set on the Organisation topical past paper questions and the Cell Structure quiz.

How cell structure connects to the rest of the syllabus

Cell structure leads into Levels of Organisation and Size of Specimens. Use the Plant Cells Flashcard for quick recall. The Cambridge IGCSE Biology resource hub links all Organisation subtopics.

Common mistakes students make

• Saying the nucleus makes energy — that is mitochondria.
• Forgetting ribosomes when listing shared structures.
• Describing the cell wall as permeable — it is fully permeable; the membrane is selectively permeable.
• Comparing without stating similarities (compare needs both).
• Confusing chloroplasts (photosynthesis) with chromoplasts (not on syllabus).

When you need more support

Work through the Organisation topical past paper questions and the Cell Structure quiz, then get help from a Cambridge IGCSE Biology tutor.

Frequently asked questions

What organelles are in both animal and plant cells? Nucleus, cytoplasm, cell membrane, mitochondria and ribosomes.

Why do plant cells have a large vacuole? It stores cell sap and helps maintain turgor pressure, keeping the cell rigid.

What is the difference between cell wall and cell membrane? The cell wall (plants) supports and strengthens; the cell membrane controls entry and exit of substances.

How do I revise cell structure effectively? Learn the organelle table, practise compare questions, then take the Cell Structure quiz.

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