How to tackle "explain" and "suggest" questions in H2 Biology

How to Tackle "Explain" and "Suggest" Questions in H2 Biology

You read the question, recall the content, and write down what feels like a complete answer. Then the mark scheme shows that you've scored only one out of three…

If this sounds familiar, there's a good chance you're losing marks not on what you know, but on how you answer. And two of the biggest culprits are two of the most common question types in H2 Biology: "explain" and "suggest".

Most students treat them the same way. “A” students don't!

Why These Two Questions Are Not the Same Thing

This is the mistake that costs marks before a student even puts pen to paper.

"Explain" and "suggest" look similar. But Cambridge uses them with a very specific and very different intent - and if you don't know the difference, you will approach them wrong every single time.

Here's the distinction:

"Explain" means there is a correct, specific answer, and the examiner expects you to know it. You are being asked to demonstrate understanding of an established biological mechanism, process, or relationship. Precision matters. Scientific language matters. Hedging does not.

"Suggest" means the examiner is deliberately placing you in unfamiliar territory. The scenario may be novel. The data may be something you've never seen. There might not be a single correct answer. You are being tested on whether you can apply your biological knowledge logically and creatively to a new context.Same number of marks on paper. Completely different game.

How to Answer "Explain" Questions

The most common way students lose marks on "explain" questions is by describing instead of explaining.

Describing tells the examiner what happened. Explaining tells the examiner why or how it happened instead at the level of biological mechanism.

Take a question like: "Explain why the rate of enzyme activity decreases above the optimum temperature."

A describing answer: "At high temperatures, enzymes stop working."

An explaining answer: "Above the optimum temperature, the increased thermal energy causes vibration of the bonds maintaining the tertiary structure of the enzyme. This leads to denaturation: the active site changes shape, and the enzyme-substrate complex can no longer form."

Both students "know" the content. Only one answers the question.

What to do: When you see "explain", ask yourself: what is the biological mechanism behind this observation? Push your answer one level deeper than what you can observe. Link cause to effect, effect to consequence. Use the precise scientific terms the mark scheme expects, not everyday English approximations.

A useful internal check: if your answer could appear in a general knowledge article for a non-scientist, it probably isn't specific enough.

How to Answer "Suggest" Questions

"Suggest" questions trip students up in the opposite direction: they freeze.

Because the scenario feels unfamiliar, students either leave it blank or hedge so heavily that their answer scores nothing. "It could possibly be due to some kind of enzyme..." is not a suggestion in this case.

Here's the key insight: suggest questions are not knowledge gaps. They are application tests. The biology you need is always something you've studied. The examiner is just presenting it in a context you haven't seen before.Your goal here is to identify which part of the syllabus is being activated, then apply it confidently!

What to do:

First, read the scenario carefully and ask: what biological concept or process does this remind me of? Is this about membrane permeability? Enzyme inhibition? Gene expression? Osmosis? The unfamiliar surface usually maps onto familiar content.

Second, commit to your answer. "Suggest" does not mean guess, it means reason your knowledge to a logical conclusion. Examiners reward a well-reasoned response, even if it's not the exact answer on the mark scheme. What they penalise is vagueness.

Third, justify your suggestion. State and link it back to biological reasoning: "I suggest the membrane permeability increased because..." is always stronger than "the membrane permeability increased."

A Practical Framework for Both Question Types

Here's a simple approach to carry into every paper:

When you see "explain": identify the mechanism → use precise terminology → link cause to effect in a chain. Never stop at observation.

When you see "suggest": identify the familiar concept underneath the unfamiliar context → commit to a specific answer → justify with biological reasoning. Never hedge.

And for both: count your marks. A 3-mark "explain" needs three distinct, creditable points, not one well-written paragraph that the examiner can only credit once.

The Pattern Behind the Marks

After working through enough mark schemes, you'll notice something: "explain" and "suggest" questions are not testing different knowledge. They're testing different cognitive skills.

"Explain" rewards depth and precision — the ability to unpack a mechanism fluently in the language of biology.

"Suggest" rewards flexibility and confidence — the ability to take what you know into new territory without falling apart.Both skills can be trained. The students who consistently score on these questions aren't necessarily the ones who studied the most content. They're the ones who practised thinking the way the questions demand.

That's not something that happens automatically. It has to be built deliberately, through the right kind of practice, sitting with mark schemes, diagnosing exactly where answers fall short, and rewriting until the thinking is clean.

Start With Your Next Practice Paper

The next time you attempt a past year paper, don't just check whether your answer is "correct". Identify every "explain" and "suggest" question and ask yourself honestly: did I describe, or did I explain? Did I hedge, or did I suggest with reasoning?

The gap between what you know and what you score almost always lives in that distinction.

At Synapse, we give students access to a curated bank of past year and practice papers, and more importantly, we teach you exactly how to approach them. That means learning to recognise question types on sight, applying the right framework before you write a single word, and reviewing your answers the way an examiner would. Not just marking yourself right or wrong, but understanding precisely why a response scores and why another doesn't.

Because a stack of practice papers without the technique to work through them properly is just busywork. The right approach turns every paper into a feedback loop, and that's where real improvement happens!

 Claim your free trial class today →