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Why size creates a problem

Why size creates a problem

Every substance entering or leaving an organism must cross a surface. Surface area determines how much exchange can occur, while volume represents the amount of living tissue that must be supplied.

2.2 The challenges of size Lesson

  1. GCSE
  2. /Biology
  3. /2.2 The challenges of size

Step-by-step lessons on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

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