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CXC · CSEC · Human and Social Biology

Free CXC CSEC Human and Social 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.

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What the real CXC CSEC Human and Social 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 Human and Social Biology syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

A Trinidad student heated a sample of sugar cane juice with Benedict's solution. The mixture changed from blue to brick-red. This indicates that the sugar cane juice contains:

  1. Starch
  2. Non-reducing sugar only
  3. Reducing sugar
  4. Protein
Show answer & explanation
✓ Answer: C — Reducing sugar
Award 1 mark for identifying that a brick-red precipitate with Benedict's solution indicates reducing sugar. A is incorrect — starch is tested with iodine. B is incorrect — non-reducing sugars do not give a positive result with Benedict's test without prior hydrolysis. D is incorrect — protein is tested with biuret reagent.
Q2 · Difficulty 1/3

Which hormone is primarily responsible for the development of secondary sexual characteristics in males during adolescence?

  1. Oestrogen
  2. Testosterone
  3. Progesterone
  4. Follicle-stimulating hormone
Show answer & explanation
✓ Answer: B — Testosterone
Award 1 mark for identifying testosterone as the male sex hormone responsible for secondary sexual characteristics such as deepening of voice, facial hair growth, and muscle development. A is incorrect — oestrogen is the primary female sex hormone. C is incorrect — progesterone is involved in the menstrual cycle and pregnancy. D is incorrect — FSH stimulates sperm production but does not directly cause secondary sexual characteristics.
Q3 · Difficulty 1/3

Which of the following is the correct pathway for a nerve impulse in a simple spinal reflex arc?

  1. A. Effector → Motor neurone → Relay neurone → Sensory neurone → Receptor
  2. B. Receptor → Sensory neurone → Relay neurone → Motor neurone → Effector
  3. C. Receptor → Motor neurone → Relay neurone → Sensory neurone → Effector
  4. D. Receptor → Relay neurone → Sensory neurone → Motor neurone → Effector
Show answer & explanation
✓ Answer: B — B. Receptor → Sensory neurone → Relay neurone → Motor neurone → Effector
The correct reflex arc pathway goes from the receptor through the sensory neurone to the relay neurone in the spinal cord, then via the motor neurone to the effector. Options A is the reverse pathway. Options C and D incorrectly place the motor and sensory neurones in the wrong positions.
Q4 · Difficulty 2/3

A fertilised egg is called a:

  1. gamete
  2. zygote
  3. embryo
  4. fetus
Show answer & explanation
✓ Answer: B — zygote
Fertilisation forms a zygote.
Q5 · Difficulty 2/3

The organ in which a baby develops during pregnancy is the:

  1. ovary
  2. uterus (womb)
  3. bladder
  4. oviduct
Show answer & explanation
✓ Answer: B — uterus (womb)
The fetus develops in the uterus.
Q6 · Difficulty 2/3

A student accidentally touches a hot surface and immediately withdraws her hand. Which statement BEST explains why this response occurs so rapidly?

  1. A. The brain sends a fast signal directly to the hand muscles
  2. B. The impulse bypasses the spinal cord and travels straight to the effector
  3. C. The response is coordinated in the spinal cord without waiting for the brain to process the signal
  4. D. The pain receptors in the skin amplify the signal before sending it to the brain
Show answer & explanation
✓ Answer: C — C. The response is coordinated in the spinal cord without waiting for the brain to process the signal
In a spinal reflex, the response is coordinated at the level of the spinal cord, which dramatically shortens the pathway and reduces response time. The brain does eventually receive information about the event but this happens after the withdrawal has already occurred. The impulse does not bypass the spinal cord.
Q7 · Difficulty 1/3

The male gamete in humans is the:

  1. egg
  2. sperm
  3. zygote
  4. embryo
Show answer & explanation
✓ Answer: B — sperm
Sperm is the male gamete.
Q8 · Difficulty 1/3

Which of the following correctly identifies the two main divisions of the human nervous system?

  1. Sensory nervous system and motor nervous system
  2. Sympathetic nervous system and parasympathetic nervous system
  3. Somatic nervous system and autonomic nervous system
  4. Central nervous system and peripheral nervous system
Show answer & explanation
✓ Answer: D — Central nervous system and peripheral nervous system
Award 1 mark for option A. The human nervous system is divided into the central nervous system (CNS), comprising the brain and spinal cord, and the peripheral nervous system (PNS), comprising all nerves outside the CNS. B is incorrect because the somatic and autonomic systems are subdivisions of the PNS, not the top-level divisions. C confuses subdivisions of the autonomic nervous system with the primary divisions of the entire nervous system. D is incorrect because sensory and motor describe the types of neurones, not the structural divisions of the nervous system.
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CXC CSEC Human and Social Biology FAQ

What does the CXC CSEC Human and Social Biology exam look like?
The CXC CSEC Human and Social 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 Human and Social 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 Human and Social 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.