IGCSE Biology Success: The Ultimate Cheat Sheet to Decoding Command Words for Top Marks

03/17/2026

Many students find the IGCSE Biology syllabus very hard to master. They study for many hours but still do not get an A* grade. At IB Global Academy, we provide the best IGCSE Biology online tuition in Gurgaon. Our IGCSE Biology teachers know exactly what examiners want to see in your answers.

Command Word	What You Must Do in Your Answer
State / Name	Give a short, direct fact with no explanation.
Describe	Tell what something looks like or what happens in steps.
Explain	Give scientific reasons "why" or "how" using "because".
Compare	List both the similarities and the differences between two things.
Suggest	Use your knowledge to solve a new or strange situation.
Calculate	Do the math and always include the correct units.
Evaluate	Give the pros and cons and end with a clear conclusion.
Draw / Label	Make a clear diagram and put labels in the right spots.

Why Command Words Matter for Your Grade?

Command words are the most important part of any exam question. They tell you exactly how to write your answer.

If you ignore these words, you will lose easy marks. Many students write long stories when the question only asks them to State a fact.

Our IGCSE Biology online tutor in India helps you practice these words every day. This is why our students get top marks in the IGCSE Biology Course.

Mastering the "Big Three": State, Describe, and Explain

How to Use "State"

• Keep it short: You only need to give a one-word answer or a short phrase.
• Do not explain: Examiners do not give extra marks for long stories here.
• Example: If asked to "State the organ that makes bile," just write "liver".

How to Use "Describe"

• Say what you see: Talk about what something looks like or what happens in an experiment.
• Use the right order: For processes like inhalation, list the steps in a logical way.
• Forget the "why": You do not need to give reasons in a Describe question.
• Example: To describe a villus, say it is finger-like and has thin walls.

How to Use "Explain"

• Use the word "because": This is the most important word for an Explain question.
• Link cause and effect: Show how one thing leads to another in a chain.
• Scientific reasons: Use biological terms to show you understand the science.
• Example: Explain why a red blood cell bursts in pure water by talking about osmosis and water potential.

The Challenge of "Compare" and "Evaluate"

Comparing Like a Pro

• Use both sides: You must talk about how things are the same and how they are different.
• Use linking words: Use words like "whereas," "both," or "however" to connect your points.
• Example: When you compare mitosis and meiosis, say both are types of cell division.
• Specific differences: Mention that mitosis makes two cells, while meiosis makes four.

Evaluating for Full Marks

• The "Pros" and "Cons": Always give the advantages and the disadvantages.
• Opinion matters: You must give a conclusion at the end of your answer.
• Example: If you evaluate artificial fertilisers, talk about high crop yields and water pollution.

Using Your Knowledge in "Suggest" Questions

Suggest questions can be very scary for students. These questions are often about things you did not learn in your textbook.

The examiner wants to see if you can use your science brain to solve a new problem. You should make an educated guess based on what you already know.

Our IGCSE Biology tutor in India teaches you how to stay calm. We help you use logic to find the right answer for these tricky questions.

The Importance of Precise Biological Language

Using everyday words will not get you an A* grade. Examiners look for precise biological language in every answer.

You must use terms from the IGCSE syllabus correctly. Vague language often leads to a low score.

Keywords for Cell Structure

• Mitochondria: Always link this to aerobic respiration.
• Ribosome: This is the site of protein synthesis.
• Partially permeable membrane: Use this term instead of "semi-permeable" for osmosis.
• Active transport: Always say it needs energy and goes against the concentration gradient.

Keywords for Human Systems

• Kidney: Remember that the kidney excretes urea and forms urine.
• Villi: These finger-like projections are for the absorption of nutrients.
• Alveolus: This is where gas exchange happens in the lungs.
• Capillary: Mention their thin walls for fast diffusion.

Expert Tips from Examiner Reports

Recent reports say that candidates often ignore the command word. This leads to answering in the wrong style and losing marks.

For "State two factors," only give exactly two. Extra answers will not give you more credit.

Another common mistake is confusing absorption and assimilation. Absorption is moving nutrients into the blood, while assimilation is making them part of cells.

The Word Bank Method for Long Questions

For 6-mark questions, we teach our students the Word Bank Method. This helps you structure your answer perfectly.

First, underline the command word and circle the biological keywords. Then, write a list of all the key terms related to the topic on the side of your paper.

Write one sentence for each keyword. As you write, cross the word off your list so you do not repeat yourself.

This method ensures your answer is logical and covers every point. It is a favorite tool in our IGCSE Biology online tuition in Delhi.

Common Mistakes to Avoid

• Confusing terms: Do not mix up mitochondria and ribosomes in pictures.
• Wrong tests: Remember that Benedict’s solution is for reducing sugars and turns brick red.
• Excretion errors: Do not say the bladder excretes urea; the kidney does that work.
• Environment vs Genes: Always remember that the environment affects variation like height.

How do different command words change my answer's structure?

In IGCSE Biology, command words are essential instructions that dictate the specific structure and depth required for your answer. Ignoring these words often leads to answering in the wrong style and losing marks.

Different command words change your answer's structure in the following ways:

State, Name, or Identify

• Structure: These require a short and direct response, often just one word or a brief phrase.
• Content: You should only recall or identify a specific fact without any further development.
• Example: If asked to state the organ that makes bile, you should simply write "liver". Writing a long explanation here is a common mistake that wastes time.

Describe

• Structure: A medium-length account that lists features, characteristics, or steps in a process.
• Content: You must "say what you see" or what happens. Crucially, you should not provide reasons or use the word "because".
• Example: To describe a villus, you would list its physical features, such as being finger-like and having thin walls.

Explain

• Structure: A longer, structured response that sets out purposes or reasons.
• Content: You must show a clear cause-and-effect chain. The word "because" is a vital part of your answer to link scientific reasons to the process.
• Example: To explain why an enzyme works best at its optimum temperature, you must describe the kinetic energy of molecules and the specific shape of the active site.

Compare

• Structure: An explicit commentary on both similarities and differences between two or more items.
• Content: You must use comparative language like "whereas," "both," "longer," or "faster".
• Constraint: You should not write two separate descriptions of each item; they must be directly compared to earn full credit.

Evaluate

• Structure: A balanced argument presenting both advantages and disadvantages (pros and cons).
• Content: The answer must conclude with a clear judgment or opinion supported by the evidence you provided.

Suggest

• Structure: A logical proposal based on scientific principles.
• Content: These questions typically involve unfamiliar situations or novel experiments not found in textbooks. You are expected to apply your existing knowledge to deduce a sensible answer.

Guidance on Mark Allocation

The number of marks available serves as a guide for how much you should write:

• 1 mark: Usually a "State" or "Identify" task requiring one clear point.
• 2–3 marks: Often "Describe" or "Explain," requiring several linked points.
• 6 marks: Requires a highly logical and comprehensive structure. For these longer questions, using a "Word Bank Method"—listing all relevant keywords first and then crossing them out as you use them in sentences—can help ensure you cover all necessary syllabus terminology.

Why Choose IB Global Academy?

We are the leading provider of IGCSE Tuition. Our team has years of experience helping students reach their dreams.

We offer the most comprehensive IGCSE Biology online tutor in India. We use past papers and mark schemes to train you like a professional.

Our IGCSE Biology Course includes free resources and a free trial session. We match you with the perfect teacher for your learning style.

If you need an IGCSE tutor in India, we are here to help. We provide 24/7 support and personalized learning plans.

Final Thoughts for Your Exam Day

Always read the question two times before you start writing. Underline the command word so you know what the examiner wants.

Check the number of marks. If a question is worth 3 marks, you should make 3 clear points.

With the right help from IGCSE teachers, you can succeed. Decoding command words is the secret key to your top grade.

Contact IB Global Academy today to start your journey. Let us help you master the IGCSE Biology syllabus and ace your exams!