Pearson Edexcel International GCSE in Biology · 4BI1 · Free · no account needed
The Eye — Focusing, and the Pupil Reflex — exam questions
9 original Incandio exam-style questions on the Eye — Focusing, and the Pupil Reflex, 20 marks, about 20 minutes of writing. Each one carries the command word, the tariff and the specification statement it assesses, exactly as a paper presents them. This is an original Incandio practice question, written to reflect the structure and demands of the qualification. It is not an official Pearson Edexcel past-paper question.
This is the practice set for The Eye — Focusing, and the Pupil Reflex — the lesson that teaches it. Read the lesson first if the idea is new; come here when you want to find out whether you can turn it into marks. Completely free, no account needed to read.
What these questions ask of you
7 command words run through this set, and on Pearson Edexcel International GCSE Biology each one means something precise. Answering the wrong command is the commonest way a candidate who understands the lesson still loses the mark.
- Which (1 mark)
- one option chosen from the set given
- State (1 mark)
- one precise fact, no justification
- Name (1–2 marks)
- the correct term, spelled recognisably
- Explain (2–4 marks)
- a causal chain — WHY it happens, each link a separate marking point Misread as: describing what happens without giving the reason it happens
- Describe (2–4 marks)
- developed, linked statements of WHAT happens — no reason required, but detail is Misread as: giving one bare statement where the tariff asked for a developed account
- Suggest (1–3 marks)
- a plausible answer applying taught biology to a situation not taught
- Calculate (1–3 marks)
- a numerical answer, with working where the tariff implies steps
Assessed on Paper 1 (4BI1/1B) and Paper 2 (4BI1/2B), against AO1, AO2, AO3.
Where these sit in the specification
Pearson Edexcel International GCSE Biology (4BI1) — statements 2.91 · 2.92. Incandio is aligned to this specification; it is not published by, endorsed by or affiliated with Pearson, and it reproduces none of Pearson's wording.
The 9 questions
Answer them on paper, then open the lesson's exam practice to have them marked. The mark scheme, the accepted and rejected answers and the annotated model answer are in Incandio and are not printed here — an answer beside its question is not practice.
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Table 1 — pupil diameter measured on one person under four light intensities. Light intensity / lux Pupil diameter / mm 1 7.4 50 5.1 500 3.6 5000 2.2 (a)
(2)Describe
Describe the relationship shown in Table 1.
Table 1 — pupil diameter measured on one person under four light intensities. Light intensity / lux Pupil diameter / mm 1 7.4 50 5.1 500 3.6 5000 2.2 (b)
(2)Calculate
Calculate the percentage decrease in pupil diameter between 1 lux and 5000 lux. Give your answer to 3 significant figures.
Table 1 — pupil diameter measured on one person under four light intensities. Light intensity / lux Pupil diameter / mm 1 7.4 50 5.1 500 3.6 5000 2.2 percentage decrease = ............................ %
(c)
(2)Explain
Explain the biological advantage of the change shown in Table 1.
Table 1 — pupil diameter measured on one person under four light intensities. Light intensity / lux Pupil diameter / mm 1 7.4 50 5.1 500 3.6 5000 2.2 (Total for Question 1 = 6 marks)
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(1)Which
Which part of the eye contains the light receptor cells?
Part A the cornea B the iris C the lens D the retina (Total for Question 2 = 1 mark)
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(1)State
State the function of the cornea.
Figure 1 — a horizontal section through the human eye. (Total for Question 3 = 1 mark)
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(2)Name
Name the two sets of muscles in the iris.
Figure 1 — a horizontal section through the human eye. (Total for Question 4 = 2 marks)
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(4)Explain
Explain how the eye focuses on an object close to the face.
Figure 1 — a horizontal section through the human eye. (Total for Question 5 = 4 marks)
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(3)Describe
Describe what happens in the iris when a person walks from a dark room into bright sunlight.
(Total for Question 6 = 3 marks)
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(3)Suggest
A patient is given eye drops that paralyse the ciliary muscle. Suggest what difficulty this causes and why.
(Total for Question 7 = 3 marks)
Have them marked, then defend the answer
Practice tells you the mark; teaching it back tells you whether you understand it. On Incandio a topic counts as mastered only once you have taught it and defended it.
- Mark these questions — 9 questions, marked on Incandio against the authored scheme, with the mistake you actually made named.
- Teach it — explain the Eye — Focusing, and the Pupil Reflex to Ember, an AI pupil who does not have it yet and asks the awkward question.
- Defend it — argue it against Johannes Kepler over three rounds, marked against descriptors you can read first.
Completely free. No subscriptions, no paywalls, no account needed to start.
Back to the lesson
- The Eye — Focusing, and the Pupil Reflex — One sense organ, two adjustments: how the eye sharpens an image and how it controls the amount of light it lets in.
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