Is There a Marine Biology GCSE? The IGCSE Marine Science Route Explained

There’s no marine biology GCSE from the English exam boards. The closest match is Cambridge IGCSE Marine Science (0697), which UK ENIC rates as comparable to a GCSE. It covers the oceans, marine organisms and marine ecology in six topics, assessed by two written papers of 1 hour 45 minutes each.

If you’ve typed “marine biology GCSE” into Google, you’re not alone. Lots of teenagers who love the ocean go looking for it and find nothing on the AQA or Edexcel websites. Don’t worry. The qualification you want just has a different name.

This guide explains that route: what you learn, how the papers work, how tough it can be (with real results) and how to sit it as a private candidate. Then we’ll look at which subjects help if you want to work with marine life one day.

Is there a marine biology GCSE in the UK?

No. The English boards offer Biology, Combined Science and Geography, but no marine biology GCSE. Some tutors sell a “GCSE marine biology” course, but read the small print and they’re teaching the 0697 IGCSE.

An IGCSE (International GCSE) is designed for 14 to 16 year olds. The official 0697 document says UK ENIC, the UK agency that compares international qualifications, found these IGCSEs comparable to the standard of the GCSE, so sixth forms, colleges and universities treat a good grade like a GCSE pass.

What makes it different

It’s built around the ocean. You’ll do some physics (density, pressure, tides), some chemistry (pH and salinity) and lots of biology. You’ll sometimes hear it called “marine biology IGCSE”, but Marine Science is the name on your certificate.

Tropical coral reefs are one of the coastal ecosystems in the marine ecology topic.

How it compares with GCSE Biology

It isn’t a replacement for Biology. Lots of teenagers take both, because a marine biology course at university will want strong biology too.

What you learn

We’ve written a full guide to the IGCSE Marine Science syllabus, so here’s a short version of its six topics.

1. The Earth and its oceans

The Earth and its oceans covers the planet’s structure, plate tectonics, tsunamis, tides and currents. It opens with an introduction to Earth as a planet and soon reaches the five major oceans.

2. Sea water

The water cycle, pH, salinity (how salty the water is), dissolved gases, density and upwelling, starting with particle theory and states of matter.

3. Marine organisms

Cells, reproduction, fish, seagrass and kelp, turtle and coral life cycles plus migration. It begins with plant cell structure, then how marine organisms are classified.

4. Nutrients and energy

Nutrients and energy covers food tests, respiration and photosynthesis, then how to build marine food chains and food webs.

5. Marine ecology

Marine ecology is the closest thing to “marine biology” here. You learn how marine organisms are adapted to the open ocean, rocky and sandy shores, mangrove forests and tropical coral reefs. You also learn how scientists survey a shore. Our lesson on quadrat sampling methods shows how this is taught.

6. Human influences on the marine environment

Tourism, fishing, fish farming, oil, ocean energy, plastic pollution, climate change and conservation, including Marine Protected Areas. Start with why marine ecosystems matter to humans and finish with conservation strategies.

How the papers work

Assessment is by two written papers that everyone sits at the end. There’s no coursework. Both papers use short-answer and structured questions (questions split into parts, a), b), c) and so on).

Source: 0697 syllabus for 2027, 2028 and 2029 (version 1, published September 2024).

Paper 1: Theory and Data Handling

Paper 1 is mostly about what you know, in structured questions that build up step by step. About a third of its marks are for reading graphs and tables, doing calculations and applying ideas to new situations. Calculators are allowed.

Paper 2: Theory and Practical Skills

Paper 2 asks about experiments in writing, so there’s no lab test. You might plan an investigation, name the variables, spot an odd result or suggest an improvement. The course lists practical activities to do as a minimum, such as testing the pH of sea water, fresh water and rain water with universal indicator, using a Secchi disc to measure how clear water is and sampling with quadrats.

Testing water with universal indicator is a practical you can do with simple kit on a desk.

Command words and a sample question

Each question starts with a command word. “Describe” means give the main features. “Explain” means say why or how. Others include state, outline, compare, calculate, suggest and evaluate.

Here’s a question in the style of Paper 1: Explain why warm water in the ocean usually holds less dissolved oxygen than cold water. [2 marks] A 2-mark answer: gases are less soluble in water as the temperature rises (1 mark), so warmer water holds less oxygen before it escapes to the air (1 mark).

Is it hard?

It takes steady work. There’s no advanced maths and no tiers, though, so everyone can aim for the top. Here’s how candidates did worldwide in the most recent June results.

About two in three got a C or above. One in four got an A or A*. That’s below IGCSE Biology in the same series (75.2% at C or above), so don’t treat it as the easy choice. Experimental work alone is worth 20% of the total, so practise Paper 2 style questions from the start.

Taking it as a private candidate

Few schools teach this subject, so many of the teenagers who take it study online. That’s fine: private candidates can enter for 0697. A private candidate is someone who sits exams at a centre without being enrolled there.

Four steps to sitting the papers

1. Find a centre. The private candidates page explains how to find a school or approved centre that accepts private candidates.
2. Book early. Centres set their own entry deadlines and fees, often months ahead.
3. Check the year. Make sure you’re following the version for the year you’ll sit.
4. Do the practicals yourself. There’s no practical test, so you don’t need a lab. Many activities, like the pH test, work with simple kit.

Our guide to GCSEs for home educated students walks through the whole process. IGCSE vs GCSE shows why IGCSEs suit independent learners.

Learning online means you can take Marine Science wherever you live, even if no school near you teaches it.

Which GCSEs do you need for marine biology?

If you’d like to become a marine biologist, the subjects you take at 14 to 16 matter more than any one course name. There are no fixed marine biology GCSE requirements, but these help most:

• Biology (or Combined Science), the most important one for later
• Chemistry and Physics, for water, density and pressure
• Maths and English, which most sixth forms and universities ask for
• Geography, useful for coasts and fieldwork
• Marine Science, to show a real interest and get a head start

After your IGCSEs

There’s also an AS and A Level Marine Science (9693). The 0697 document says those with A* to C are well prepared for it. Universities usually want A level Biology, often with another science or maths. The University of St Andrews Marine Biology BSc, for example, asks for AAB at A level (its standard offer), including Biology and one of Chemistry, Maths or Physics.

According to Prospects, you’ll need a marine-focused course at university, such as marine biology or oceanography. Postgraduate study is common too.

Aquarium visits, rock pooling and beach cleans are good ways to build your interest alongside the course.

How to prepare

Each IGCSE is designed to take about 130 guided learning hours. Most people spread that over two years, though you can go faster. A simple plan:

• Year 1, autumn: The Earth and its oceans
• Year 1, spring: Sea water, plus the pH and density practicals
• Year 1, summer: Marine organisms
• Year 2, autumn: Nutrients and energy, then marine ecology
• Year 2, spring: Human influences, then past papers and revision

Use the planner to see how many lessons a week you’d need for your exam date.

Learning it with Brainy Lemons

Our IGCSE Marine Science online course follows 0697 in order, so it’s a straightforward way to take the marine biology GCSE alternative wherever you live. It includes:

• 260 short lessons, from The Earth and its oceans to conservation
• A quiz, a quiz show and a zombie defence game on every lesson
• 4,761 flash cards, from easy to exam-hard
• 11 3D games for the hardest topics, from tides to atolls

See what’s included in the Cambridge IGCSE Marine Science course, or start with lesson 1.

Marine biology GCSE FAQs

Can you do marine biology at GCSE?

Not with AQA, Pearson Edexcel or OCR. The closest match is the 0697 Marine Science IGCSE, at the same standard as a GCSE.

Is marine biology IGCSE the same as Marine Science?

Yes. People often call it that, but the official name is Marine Science, code 0697.

Can I take it as a home educated student?

Yes. Private candidates can enter. You book your papers through a school or approved centre that accepts private candidates.

How many papers are there?

Two: Paper 1 Theory and Data Handling and Paper 2 Theory and Practical Skills. Each is 1 hour 45 minutes, 80 marks and half of the total.

What GCSEs do I need to become a marine biologist?

Aim high in Biology (or Combined Science), Maths and English, plus other sciences. Marine Science and Geography help too.

Is there coursework?

No, practical work is tested in writing in Paper 2, so there’s no coursework or lab test.