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OCR · GCSE · Biology

B3: Organism Level Systems
Practice Questions

40 OCR GCSE Biology questions on B3: Organism Level Systems, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for B3: Organism Level Systems.

Try 2 sample questions on B3: Organism Level Systems

Question 1 · 1 mark · Difficulty 1/3

How are hormones transported around the body?

  1. In the blood plasma
  2. Along sensory neurones
  3. Through the digestive system
  4. In the air in the lungs
Show answer & explanation
✓ Answer: A — In the blood plasma
Award 1 mark. Endocrine glands secrete hormones directly into the blood, which carries them to target organs. Sensory neurones carry electrical impulses, and the digestive system and lungs do not transport hormones.
Question 2 · 1 mark · Difficulty 1/3

What is homeostasis?

  1. Breaking down large food molecules into small ones
  2. Keeping internal conditions in the body at stable, optimum levels
  3. The movement of water across a partially permeable membrane
  4. Producing glucose from carbon dioxide and water using light
Show answer & explanation
✓ Answer: B — Keeping internal conditions in the body at stable, optimum levels
Award 1 mark. Homeostasis controls conditions such as body temperature, blood glucose and water content so that enzymes and cells work well. Breaking down food is digestion, water movement across a membrane is osmosis, and making glucose using light is photosynthesis.
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OCR GCSE Biology: B3: Organism Level Systems FAQ

Is Kramizo free for OCR GCSE students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix B3: Organism Level Systems practice with other Biology topics or even switch to a totally different OCR subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the B3: Organism Level Systems questions aligned to the official OCR GCSE Biology syllabus?
Every question is written against the published OCR GCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real OCR paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from OCR.
How is B3: Organism Level Systems typically tested on OCR GCSE Biology papers?
B3: Organism Level Systems appears across multiple question types on real OCR GCSE Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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