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This final lesson brings everything together. Instead of teaching a new technique, it walks you through a realistic mixed set of questions — the kind you meet across an OCR Gateway Biology paper — showing the thinking behind each one and a model answer. You will see a multiple-choice item, a short calculation, a data/graph question, a short structured question and a 6-mark extended response, so the whole toolkit from the earlier lessons comes together in one place.
All the questions below are original practice questions written in the OCR style. They are not reproduced from any real past paper.
By the end of this lesson you should be able to approach each question type with a clear routine, apply the right command-word response, show working with units, interpret data, and structure a 6-mark answer to reach the top band.
Exam Tip: Before the first question, spend two minutes scanning the whole paper, check no pages are missing, and note where the 6-mark question is so you can budget time for it. Remember the timing: roughly 1 minute per mark over the 90-mark, 105-minute paper, leaving about 10 minutes to check.
Which row correctly describes where aerobic respiration takes place and what it produces?
A Chloroplast — glucose and oxygen B Mitochondrion — carbon dioxide and water C Nucleus — glucose and water D Ribosome — carbon dioxide and oxygen
The thinking: First answer it in your head — aerobic respiration happens in the mitochondria and produces carbon dioxide and water. Now check the options. A describes photosynthesis (wrong process and location). C and D give the wrong site. Only B matches both the location and the products.
Answer: B.
Exam Tip: Always read all four options and answer in your head first. Distractor A is deliberately "photosynthesis" to catch anyone who confuses the two processes — a reminder to read the whole row, not just the location.
In a photosynthesis investigation, a student counts 84 oxygen bubbles released by pondweed in 3 minutes. Calculate the rate of photosynthesis in bubbles per minute.
The thinking: "Calculate" means show working and give a unit. Rate is amount ÷ time.
Step 1 — write the formula.
rate=timenumber of bubbles
Step 2 — substitute.
rate=384
Step 3 — calculate and add the unit.
rate=28 bubbles per minute
Answer: 28 bubbles per minute.
Exam Tip: Even if you mis-divided, writing the formula and substitution earns the method mark. The unit ("bubbles per minute") is part of the answer — leaving it off would cost the final mark.
A student investigated how the concentration of sugar solution affects the change in mass of potato cylinders. The results are plotted below. (a) Describe the trend shown. (2) (b) Use the graph to find the concentration at which there is no overall change in mass, and explain what is happening to the potato cells at that point. (2)
The thinking for (a): "Describe the trend" — direction plus quoted figures, no reasons needed. The line falls steadily from positive to negative as concentration rises.
Model answer (a): "As the sugar concentration increases, the percentage change in mass decreases. At low concentration (0.0 mol/dm³) the mass increases by about +8%, and at high concentration (0.8 mol/dm³) it decreases by about −8%. The change in mass falls steadily across the range." (2 marks: direction + quoted figures.)
The thinking for (b): Read off where the line crosses zero on the y-axis — that is the concentration at which the gain and loss of water balance. Then explain the biology.
Model answer (b): "The line crosses zero at about 0.4 mol/dm³. At this concentration the potato neither gains nor loses mass because the water concentration (water potential) inside the cells equals that of the solution, so there is no net movement of water by osmosis across the partially permeable membranes." (2 marks: read-off + osmosis explanation.)
Exam Tip: The point where a graph crosses an axis is often the answer to "no change" questions. Use a ruler to read it off precisely, and back the read-off with the biological reason — here, equal water potential means no net osmosis.
The diagram in an exam shows a reflex arc. (a) Name the type of neurone that carries impulses from a receptor to the central nervous system. (1) (b) Describe the role of a synapse in the reflex arc. (2)
The thinking for (a): A one-word "name" answer — pure recall (AO1). The neurone carrying impulses to the CNS is the sensory neurone.
Model answer (a): "The sensory neurone." (1 mark.)
The thinking for (b): "Describe the role" of a synapse — 2 marks, so two distinct points about what happens there.
Model answer (b): "At a synapse the electrical impulse causes the release of a chemical (neurotransmitter), which diffuses across the gap to the next neurone and triggers a new impulse in it." (2 marks: chemical released + diffuses across to start a new impulse.)
Exam Tip: Match the number of points to the tariff: a "(1)" wants one precise term, a "(2)" wants two distinct creditworthy points. For "name" questions, give the exact term and stop — extra waffle wins nothing and risks a contradiction.
A person becomes ill after being infected by a bacterial pathogen. Explain how the body defends against the pathogen and how a vaccine could protect the person from the same pathogen in future. (6 marks)
This is an explain question linking defence against disease and vaccination (B6) — a typical synoptic 6-marker. The three responses below show it answered at three levels.
Mid-band response: "When bacteria get into the body the white blood cells attack them. Some white blood cells make antibodies that stick to the bacteria and others engulf them. A vaccine has a dead version of the pathogen in it. It makes the body produce antibodies so if you get the real pathogen you are protected and don't get ill."
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