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IGCSE Biology (0610) Paper 4 Mock: Cells, Enzymes, Photosynthesis, Genetics, Ecology

IGCSE Biology (0610) Paper 4 Mock: Cells, Enzymes, Photosynthesis, Genetics, Ecology

  • 2026-10-12

TUTORZONE ORIGINAL MOCK PAPER · CAMBRIDGE IGCSE BIOLOGY (0610) PAPER 4 (THEORY EXTENDED)

Written to the Cambridge 0610 syllabus (2026-2028): Extended candidates sit Paper 2 (multiple choice, 40 marks, 30%), Paper 4 (theory, 80 marks, 50%, 1 h 15 min) and Paper 5/6 (practical, 40 marks, 20%). This is a Paper 4 mock: 10 structured questions for 80 marks with answers.

What is in the IGCSE Biology (0610) exam?

Direct answer: Extended candidates sit three papers: Paper 2 (multiple choice, 40 marks, 30%), Paper 4 (theory, 80 marks, 50%, 1 h 15 min) and Paper 5 or 6 (practical, 40 marks, 20%).

Hong Kong student studying biology with a microscope and cell diagrams
Paper 4 theory: 80 marks, 50%, 1 h 15 min – structured questions.

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01

Assessment at a glance (2027)

Component Content Weighting Duration
Paper 4 (Theory, Extended) Short-answer and structured, 80 marks 80 marks (50%) 1 h 15 min
Paper 2 (Multiple Choice, Extended) 40 four-choice items, 40 marks 40 marks (30%) 45 min
Paper 6 (Alternative to Practical) Practical-skills questions, 40 marks 40 marks (20%) 1 h

Ten questions in 1 h 15 min is about 7 minutes each. For concepts give the definition and an example (enzymes, osmosis, natural selection); for calculations show the steps (magnification, genetic ratio).

02

How this paper was built

This is a TutorZone original mock paper: the questions follow the Cambridge 0610 structure (Paper 4 theory, 80 marks, 50%) and the answers are our own, not Cambridge past papers or marking references.

Numerical answers were recomputed programmatically.

Note before you start: this is not a Cambridge past paper. Your score is a practice score and cannot be converted into an IGCSE grade.
03

Pacing

Section Marks Suggested time What to do first
Paper 4 (Theory, Extended) 80 marks (50%) about 7 min per question, 5 to check definition for concepts, steps for calculations
Paper 2 (Multiple Choice, Extended) 40 marks (30%) about 1 min per item eliminate clearly wrong options
Paper 6 (Alternative to Practical) 40 marks (20%) read data, record, analyse accurate observation and conclusion

What is the photosynthesis equation?

Direct answer: carbon dioxide + water -> (light, chlorophyll) glucose + oxygen.

04

Paper 4: structured questions (10 questions, 80 marks)

All compulsory; aim for 70 minutes with 5 to check. Definition for concepts, steps for calculations.

Question 1 (8 marks)

A microscope has a 10x eyepiece and a 40x objective. Calculate the total magnification.

Question 2 (8 marks)

Two heterozygotes (Aa x Aa) mate, where A is dominant to a. State the phenotypic ratio (dominant : recessive) of the offspring.

Question 3 (8 marks)

Name three structures of an animal cell and give one function of each.

Question 4 (8 marks)

Describe the nature of enzymes, and state how temperature affects enzyme activity.

Question 5 (8 marks)

Write the word equation for photosynthesis and state the conditions required.

Question 6 (8 marks)

Write the word equation for aerobic respiration, and state what the released energy is used for.

Question 7 (8 marks)

In the food chain grass -> rabbit -> fox, identify the producer, primary consumer and secondary consumer.

Question 8 (8 marks)

Describe two processes in the carbon cycle that return carbon dioxide to the air, and one that removes it.

Question 9 (8 marks)

Explain the difference between osmosis and diffusion.

Question 10 (8 marks)

Explain how natural selection leads to evolution.

What is the difference between osmosis and diffusion?

Direct answer: diffusion is particles moving high to low concentration; osmosis is water moving through a partially permeable membrane from high to low water potential.

05

Paper 4 answers

Question 1

Total magnification = eyepiece x objective (2): 10 x 40 = 400x (6).

Question 2

Genotypes AA : Aa : aa = 1 : 2 : 1 (4); the phenotype ratio dominant : recessive is 3 : 1 (4).

Question 3

(1) Cell membrane – controls substances in and out (3); (2) nucleus – holds the genetic material and controls the cell (3); (3) mitochondrion – carries out aerobic respiration, releasing energy (2).

Question 4

(1) Enzymes are proteins that act as biological catalysts, speeding reactions without being changed (4). (2) Activity is low at low temperature, highest at the optimum, and high heat denatures the enzyme (4).

Question 5

carbon dioxide + water -> (light, chlorophyll) glucose + oxygen (6); needs light and chlorophyll (2).

Question 6

glucose + oxygen -> carbon dioxide + water (+ energy) (6); the energy is used for cell activities (movement, growth, active transport) (2).

Question 7

Grass is the producer (3); the rabbit is the primary consumer (3); the fox is the secondary consumer (2).

Question 8

Return CO2 to the air: respiration and combustion (or decay) (3 each); removal: photosynthesis (2).

Question 9

(1) Diffusion: particles move from a high to a low concentration (4). (2) Osmosis: water moves through a partially permeable membrane from high to low water potential (4).

Question 10

There is variation in a population; when conditions change, the better-adapted individuals survive and reproduce (survival of the fittest); the favourable traits are inherited and accumulate over generations, producing evolution (8).

How does natural selection cause evolution?

Direct answer: a population varies; when conditions change the better-adapted survive and reproduce, and the favourable traits are inherited and accumulate into evolution.

06

Where these marks are usually lost

Mistake What it looks like What it costs Instead
Equation missing conditions Photosynthesis without light and chlorophyll The conditions are part of the equation State light and chlorophyll
Wrong genetic ratio Aa x Aa as 1:1 A heterozygous cross gives 3:1 Dominant : recessive = 3:1
Osmosis vs diffusion Osmosis as ordinary diffusion Osmosis is through a membrane Osmosis = water through a partially permeable membrane
07

How to use this paper

First sit: the full 1 h 15 min on all 10 questions with no references.

Mark it: check definitions and calculation steps.

Second sit: redo three to seven days later, aiming to finish inside 1 hour.

What should I do after finishing this paper?

Direct answer: log questions with missing definitions or conditions; redo in three to seven days; and drill Paper 2 multiple choice and Paper 6 practical skills.

08

FAQ

Is this a Cambridge paper?
No. The questions and answers are TutorZone originals, not Cambridge past papers or marking references.

How many papers does IGCSE Biology have?
Extended candidates sit three: Paper 2 (MC 40, 30%), Paper 4 (theory 80, 50%) and Paper 5 or 6 (practical 40, 20%).

What is the phenotypic ratio of Aa x Aa?
Dominant : recessive = 3 : 1.

09

Official references

Resource What to check
Cambridge IGCSE Biology 0610 syllabus (2026-2028) Confirm the Paper 2/4/6 marks and times
https://www.tutorzone.com.hk/en-igcse-chemistry-0620-paper-4-mock-2027/ IGCSE Chemistry (0620) Paper 4 mock

Related: practice area · IGCSE Physics Paper 4 mock · IGCSE Chemistry Paper 4 mock · IGCSE English 0500 mock

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