GCSE Bridging Workbook — Science, English & Maths

GCSE (Key Stage 4) • Ages 14–16

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For students: exam-style tasks in the style of AQA/Edexcel GCSE, themed around ecology and animals. Command words (describe, explain, calculate, evaluate) matter — answer what is asked. Mark allocations guide how much to write. Mark scheme and examiner notes at the back. This is bridging/revision material, not a substitute for a full specification.

Biology — Ecosystems & Sampling

Learning objective: Ecology, quadrats and the required practical.

1. Define the terms 'community' and 'habitat'. [2 marks]

2. A student uses a 0.5 m × 0.5 m quadrat to estimate daisy numbers on a field. They count an average of 6 daisies per quadrat. The field is 200 m². Estimate the total daisy population. Show your working. [3 marks]

3. Explain why the student should place quadrats using random coordinates rather than choosing where to put them. [2 marks]

4. Describe how you would use a transect to investigate how plant species change from a hedge to the open field. [4 marks]

Biology — Biodiversity & Human Impact

Learning objective: Evaluate human impacts on biodiversity.

1. State what is meant by 'biodiversity'. [1 mark]

2. Explain two ways that intensive farming can reduce biodiversity. [4 marks]

3. Evaluate the use of conservation schemes such as reintroducing beavers to British rivers. Give arguments for and against, then a justified conclusion. [6 marks]

Biology — Natural Selection & Evolution

Learning objective: Explain evolution by natural selection.

1. Antibiotic-resistant bacteria are an example of natural selection. Explain how a population of bacteria can become resistant to an antibiotic. [4 marks]

2. Explain why the theory of evolution was only gradually accepted after Darwin published it. [2 marks]

Maths — Ratio, Proportion & Rates

Learning objective: Higher-tier reasoning in context.

1. A wildlife charity's income and spending are in the ratio 5 : 4. If income is £180,000, how much does it spend, and what is its surplus? [3 marks]

2. A population of deer grows by 8% each year. There are 500 now. Write a formula for the number after t years, and calculate the number after 3 years. [4 marks]

Maths — Statistics & Probability

Learning objective: Interpret data and calculate probability.

A vet records the mass (kg) of 7 rescue dogs: 12, 15, 15, 18, 22, 24, 30.

1. Find the mean, median, mode and range. [4 marks]

2. One dog is chosen at random. Find the probability its mass is more than 20 kg. Give your answer as a fraction in simplest form. [2 marks]

3. The vet says 'the mean is the best average here'. Do you agree? Justify your answer. [2 marks]

English Language — Reading (Non-Fiction)

Learning objective: Analyse language and structure (AQA Paper 2 style).

Read the source, then answer.

"The badger cull divides the countryside like few other issues. To dairy farmers watching bovine TB tear through their herds, culling feels like the only weapon left. To ecologists, it is a costly cull of a protected native mammal on contested evidence. Both sides claim the moral high ground; both can point to data; neither has persuaded the other. The cattle, and the badgers, have no say at all."

1. How does the writer use language to present the badger cull as a bitter, unresolved conflict? Analyse words, phrases and techniques. [8 marks]

2. The final short sentence stands apart from the rest. Analyse its structural effect. [3 marks]

English Language — Writing

Learning objective: Produce clear, accurate persuasive writing.

'Wild animals should never be kept in zoos.' Write a speech for a school debate arguing EITHER for OR against this statement. Aim for 1 to 1.5 sides. Marks are for a clear viewpoint, structured argument, rhetorical technique and accurate spelling, punctuation and grammar. [16 marks]

Answer Key & Guidance (for the grown-up)

Biology — Ecosystems

Q1 Community = all the populations of different species in a habitat; habitat = the place where an organism lives. Q2 Density = 6 ÷ 0.25 m² = 24 per m²; × 200 m² = 4,800 daisies. Q3 Random placement avoids bias and gives a representative, valid sample. Q4 Lay a tape (transect) from hedge to field; place quadrats at regular intervals; record species/percentage cover at each; repeat and average; plot cover against distance.

Biology — Biodiversity

Q1 The variety of species (and genetic/ecosystem variety) in an area. Q2 e.g. monoculture removes habitat/food variety; hedgerow removal destroys habitat; pesticides kill insects and knock on up the food chain; fertiliser run-off causes eutrophication. Q3 (Level-marked) FOR: reduces flooding, boosts wetland biodiversity, natural process, tourism. AGAINST: can flood farmland/roads, block culverts, local opposition, cost. Conclusion must be justified by weighing the points.

Biology — Evolution

Q1 Variation exists; some bacteria carry a resistance allele (often by mutation); the antibiotic kills non-resistant bacteria; resistant ones survive and reproduce; resistance is passed on, so the resistant form spreads. Q2 It challenged religious beliefs; there was insufficient evidence at first; genes/inheritance were not yet understood.

Maths — Ratio

Q1 5 parts = £180,000 → 1 part = £36,000; spend = 4 × £36,000 = £144,000; surplus = £36,000. Q2 N = 500 × 1.08^t; after 3 yrs = 500 × 1.08³ ≈ 500 × 1.2597 ≈ 630 deer.

Maths — Statistics

Q1 Mean = 136/7 ≈ 19.4 kg; median = 18; mode = 15; range = 30−12 = 18. Q2 3 dogs >20 kg → 3/7. Q3 Reasonable either way if justified: mean uses all data but is pulled up by the 30 kg dog; median (18) may better represent a 'typical' dog.

English — Reading

Q1 (Level-marked) Look for: the simile 'divides… like few other issues'; violent verb 'tear through'; balanced antithesis of farmers vs ecologists; tricolon 'both sides… both can… neither…'. Reward analysis of effect, not feature-spotting. Q2 The short final sentence isolates the powerless subjects (cattle and badgers), creating a bleak, ironic close and shifting focus from human argument to the animals themselves.

English — Writing

Mark holistically for a sustained viewpoint, logical structure (intro–arguments–counter–conclusion), rhetorical devices (rhetorical questions, direct address, tripling, anecdote) and technical accuracy. A top answer is convincing, controlled and consistently accurate.

PawSteps · GCSE (Key Stage 4) · Ages 14–16 · pawsteps.co.uk
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