Who this is for: Cambridge IGCSE Biology (0610) students who can list MRS GREN but lose marks when questions ask them to define, describe or explain each characteristic with a real example.
What query it owns: how to understand and revise characteristics of living organisms in Cambridge IGCSE Biology.
Why this is safe: this page owns the revision-guide angle, while Tutopiya’s Characteristics of Living Organisms subtopic page owns the learning resource and the free Characteristics quiz owns the practice.

Characteristics of living organisms is the opening subtopic in Cambridge IGCSE Biology (0610) and appears on almost every Paper 1 and Paper 2. Examiners expect you to name the seven life processes — movement, respiration, sensitivity, growth, reproduction, excretion and nutrition — and to apply them when deciding whether something is living, dead or non-living. This guide explains what each characteristic means in syllabus language, how to answer the command words that appear on past papers, and where to practise.

Key takeaways

• Living organisms show all seven characteristics: movement, respiration, sensitivity, growth, reproduction, excretion and nutrition (MRS GREN).
• Define wants a precise one-sentence meaning; describe wants observable detail; explain wants the biological reason.
• Viruses are a classic exam trap — they show some characteristics but not all, so examiners often ask you to suggest why they are hard to classify.
• Link each characteristic to a named example (e.g. a plant phototropism for sensitivity) to secure method marks.

What are the characteristics of living organisms in Cambridge IGCSE Biology?

The characteristics of living organisms are the seven processes that distinguish living things from non-living matter. Cambridge IGCSE Biology (0610) uses the mnemonic MRS GREN: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition. A living organism carries out all seven; something that lacks one or more may be dead, dormant or non-living.

Read the full notes and worked examples on Tutopiya’s Characteristics of Living Organisms subtopic page before you attempt questions.

The seven characteristics you must master

These seven processes appear in almost every characteristics question. Learn what each one means and the exam phrasing that signals it.

Characteristic	What it means	How the exam uses it
Movement	Change of position or place; plants move by growth	”State one way in which plants show movement”
Respiration	Chemical release of energy from food (not just breathing)	“Define respiration”
Sensitivity	Detecting and responding to stimuli	”Describe how a plant responds to light”
Growth	Permanent increase in size and dry mass	”Explain why growth is not the same as swelling”
Reproduction	Producing offspring of the same kind	”State two methods of reproduction in plants”
Excretion	Removal of metabolic waste products	”Name a waste product excreted by humans”
Nutrition	Taking in or making food for energy and growth	”Compare autotrophic and heterotrophic nutrition”

How to answer characteristics questions — step by step

The safest method works for every define/describe/explain question on this subtopic.

1. Read the command word — define, state, describe, explain or compare — before you write anything.
2. Name the characteristic clearly if the question asks which process is shown.
3. Give the syllabus definition in one sentence for “define” or “state”.
4. Add a named example — a plant, animal or microorganism from the syllabus.
5. For “explain”, link cause and effect: stimulus → response, or food → energy release.
6. Check your answer against MRS GREN — have you addressed the process the question targets?

Once you have worked through a few, test yourself with the free Characteristics of Living Organisms quiz — it tells you fast whether the definitions have actually stuck.

Living vs dead vs non-living: which approach does the question want?

Students lose marks by treating movement as the only sign of life or by confusing respiration with breathing. Use the stem to decide.

Situation	What to do	Typical signal words
Is it living?	Check all seven characteristics	”living or non-living”, “characteristics of life”
One process only	Name that process and define it	”Which characteristic is shown by…”
Compare two organisms	Match each to the relevant characteristics	”Compare the ways in which…”
Edge case (virus, seed)	Suggest which characteristics are present or absent	”Suggest why a virus is difficult to classify”

Characteristics in past-paper wording: command words that matter

Most lost marks come from misreading the command word or giving a vague example. These are the command words you will see and what each one demands.

Command word / phrase	What the question wants	Typical characteristics stem
Define	Precise scientific meaning	”Define excretion.”
State / Name	Short factual answer, no explanation	”State two characteristics shown by all living organisms.”
Describe	What happens, in order or detail	”Describe how a mammal shows sensitivity to a stimulus.”
Explain	Why it happens; cause and effect	”Explain why respiration is essential for living organisms.”
Compare	Similarities and differences	”Compare movement in animals and plants.”
Suggest	Apply knowledge to an unfamiliar case	”Suggest why a seed may appear non-living.”

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

Practising the wording — not just the mnemonic — is what method marks reward. Here is how three real-style stems are answered.

1. “Define respiration.” Respiration is the chemical breakdown of food substances to release energy for life processes. Mark-scheme reward: “chemical” and “release of energy” — not “breathing”.
2. “A person runs a race. Name two characteristics of living organisms shown.” Movement (legs moving) and respiration (muscles releasing energy from glucose). Reward: named characteristics linked to the scenario.
3. “Explain why a virus is difficult to classify as living or non-living.” Viruses show some characteristics (e.g. reproduction inside a host cell) but lack others (e.g. no metabolism outside a host). Reward: specific characteristics named, not a vague “they are weird”.

When you can recognise the wording instantly, work the full set on the Characteristics topical past paper questions and the Characteristics quiz to lock the method in.

How characteristics connect to the rest of the syllabus

Characteristics feed directly into Concept and Use of a Classification System, where shared features group organisms into kingdoms. Nutrition links forward to human diet and plant photosynthesis; respiration underpins the entire energy topic. When you are ready to move on, the Cambridge IGCSE Biology resource hub lets you jump straight from a weak subtopic into the next.

Common mistakes students make

• Defining respiration as breathing — respiration is a chemical process in cells.
• Saying plants do not move — they move by growth (e.g. shoots towards light).
• Confusing excretion with egestion (faeces are undigested food, not metabolic waste).
• Listing MRS GREN without linking each letter to the question scenario.
• Treating growth as temporary swelling (e.g. a sponge absorbing water).

When you need more support

If characteristics questions keep tripping you up — especially explain and suggest stems — work through the Characteristics topical past paper questions and the Characteristics quiz to pinpoint the exact gap, then get focused help from a Cambridge IGCSE Biology tutor to fix it quickly.

Frequently asked questions

Is MRS GREN enough for Cambridge IGCSE Biology? Yes — all seven processes are required. Some textbooks add extra terms, but 0610 mark schemes use movement, respiration, sensitivity, growth, reproduction, excretion and nutrition.

What is the difference between define and describe? Define asks for the meaning of a term in one precise sentence. Describe asks what you observe or what happens, often with more detail and an example.

Do viruses show characteristics of living organisms? Viruses reproduce inside host cells but cannot carry out metabolism independently. Examiners often ask you to suggest why they are hard to classify.

How do I revise characteristics effectively? Read the subtopic notes, learn one example per characteristic, then take the Characteristics quiz. Revisit any explain questions you got wrong before moving on.

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