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CXC · CSEC · Biology

Free CXC CSEC Biology
Practice Paper

8 mixed-difficulty practice questions in the style of real CXC CSEC papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

Take a Mini Mock →

What the real CXC CSEC Biology paper looks like

Paper 1 (Section A)
60 multiple-choice questions, 1 mark each. 75 minutes. Tests knowledge across the whole syllabus.
Paper 2
Structured short-answer + 1 extended response question. Section A is compulsory; Section B has a choice. Approximately 2 hours 10 minutes.
School-Based Assessment (SBA)
Coursework component graded by the teacher, externally moderated. Worth ~20-30% of the final grade depending on subject.
Total exam time: ~3.5 hours across Paper 1 and Paper 2 sittings.
Grading: Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the Biology syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

A student in Trinidad investigated the effect of light intensity on the rate of photosynthesis in aquatic plants. She used the same plant species, the same volume of water, and the same temperature throughout the experiment. Which term describes the factors she kept the same?

  1. Independent variables
  2. Dependent variables
  3. Controlled variables
  4. Responding variables
Show answer & explanation
✓ Answer: C — Controlled variables
Award 1 mark for identifying that controlled variables are factors kept constant to ensure a fair test. A is incorrect — the independent variable is what the experimenter deliberately changes (light intensity). B is incorrect — the dependent variable is what is measured (rate of photosynthesis). D is incorrect — responding variable is another term for dependent variable.
Q2 · Difficulty 1/3

Abiotic factors are the ____ components.

  1. living
  2. non-living/physical
  3. animal only
  4. plant only
Show answer & explanation
✓ Answer: B — non-living/physical
Abiotic = non-living.
Q3 · Difficulty 1/3

Which process releases energy from food molecules in cells?

  1. Photosynthesis
  2. Respiration
  3. Digestion
  4. Excretion
Show answer & explanation
✓ Answer: B — Respiration
Respiration is the chemical process in cells that breaks down glucose to release energy (ATP). It occurs in all living cells continuously.
Q4 · Difficulty 2/3

A group of similar cells working together forms a:

  1. organ
  2. tissue
  3. system
  4. organism
Show answer & explanation
✓ Answer: B — tissue
Cells → tissue.
Q5 · Difficulty 2/3

Random sampling reduces:

  1. population size
  2. bias in results
  3. the habitat
  4. the species
Show answer & explanation
✓ Answer: B — bias in results
Randomness reduces bias.
Q6 · Difficulty 1/3

Biotic factors are the ____ components of an ecosystem.

  1. non-living
  2. living
  3. chemical only
  4. physical only
Show answer & explanation
✓ Answer: B — living
Biotic = living.
Q7 · Difficulty 1/3

What is nutrition?

  1. Only eating food
  2. The process of taking in and using food substances for energy, growth, and repair
  3. Only photosynthesis
  4. Only drinking water
Show answer & explanation
✓ Answer: B — The process of taking in and using food substances for energy, growth, and repair
Nutrition includes obtaining food (by eating or photosynthesis), digesting it, absorbing nutrients, and using them for energy, growth, and repair.
Q8 · Difficulty 1/3

A farmer in St. Elizabeth, Jamaica, takes a cutting from a healthy cassava plant to propagate new plants. Which type of cell division allows the cutting to grow into a new plant with identical genetic information to the parent?

  1. Meiosis
  2. Mitosis
  3. Binary fission
  4. Budding
Show answer & explanation
✓ Answer: B — Mitosis
Award 1 mark for identifying mitosis as the type of cell division that produces genetically identical daughter cells. A is incorrect — meiosis produces genetically different cells with half the chromosome number and is involved in sexual reproduction. C is incorrect — binary fission occurs in prokaryotes such as bacteria, not in plant cells. D is incorrect — budding is a form of asexual reproduction in organisms like yeast, not the type of cell division occurring in plant cuttings.
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CXC CSEC Biology FAQ

What does the CXC CSEC Biology exam look like?
The CXC CSEC Biology exam is structured across 3 components. Paper 1 (Section A): 60 multiple-choice questions, 1 mark each. 75 minutes. Tests knowledge across the whole syllabus. Paper 2: Structured short-answer + 1 extended response question. Section A is compulsory; Section B has a choice. Approximately 2 hours 10 minutes. School-Based Assessment (SBA): Coursework component graded by the teacher, externally moderated. Worth ~20-30% of the final grade depending on subject. Total exam time: ~3.5 hours across Paper 1 and Paper 2 sittings.
Can I download a free CXC CSEC Biology past paper?
Real CXC past papers are published directly by CXC on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is CXC CSEC Biology graded?
Grades: I (highest) to VI (lowest). A grade of III or above is typically required for further study. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.