Chapter 8: Triple Science, Required Practicals & Exam Mastery

GCSE BiologyPearson Edexcel8 topicsTriple

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gcse · biology · Pearson Edexcel · All papers

Releases 1 August 2026

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Triple Science, Required Practicals and Exam Mastery: GCSE Biology Long-Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions20 marks40 min

hard

4 marksDescribehardAQA / Edexcel / OCR

Biology practical planning

factor changedmeasured biological responserepeat mean

When a required practical is unfamiliar, describe how to compare two biological samples fairly. Include variables, repeats and risk assessment. (4 marks)

Read the command word before writing.
Use the stimulus or data where provided.
Show a linked chain of reasoning.
Finish with a clear answer to the question.

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4 marksCalculatehardAQA / Edexcel / OCR

Leaf epidermis microscope count

stomata counted (stomata)	field of view area (mm2)
18	0.45

A student counts 18 stomata in a microscope field of view with area 0.45 mm2. Calculate the stomatal density. Give the equation, substitution, answer and unit. (4 marks)

Read the command word before writing.
Use the stimulus or data where provided.
Show a linked chain of reasoning.
Finish with a clear answer to the question.

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6 marksExplainhardAQA / Edexcel / OCR

Effect of repeats on a biological mean

sample (sample)	repeat 1 (mm)	repeat 2 (mm)	repeat 3 (mm)
A	14	15	14
B	20	28	19

Explain why repeat readings and keeping named factors the same are important in biology practical questions. (6 marks)

Read the command word before writing.
Use the stimulus or data where provided.
Show a linked chain of reasoning.
Finish with a clear answer to the question.

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6 marksEvaluatehardAQA / Edexcel / OCR

Mean values from two practical methods

method (method)	mean result (mm)	range (mm)
A	18	2
B	23	11

Evaluate a student's claim that their biology practical result is accurate because they calculated a mean. (6 marks)

Read the command word before writing.
Use the stimulus or data where provided.
Show a linked chain of reasoning.
Finish with a clear answer to the question.

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7. Ecology

End of Pearson Edexcel

Key learning objectives

Understand the key principles behind Triple Science, Required Practicals & Exam Mastery.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.

stomata counted (stomata)

field of view area (mm2)

0.45

sample (sample)

repeat 1 (mm)

repeat 2 (mm)

repeat 3 (mm)

method (method)

mean result (mm)

range (mm)