A scientist grows a compact mass of respiring tissue in an oxygenated nutrient solution. The scientist divides the tissue into many smaller masses without removing or changing any cells. The smaller masses remain in the same solution.
Which statement explains why oxygen reaches every cell more quickly after the tissue is divided?
Dividing the tissue makes oxygen diffuse further overall because it must enter several separate masses.
Dividing the tissue reduces the oxygen needed by each cell because fewer cells are present in each mass.
Dividing the tissue increases its total exposed surface and reduces the furthest distance oxygen must diffuse.
Dividing the tissue leaves its exposed surface unchanged because the total volume of living material is unchanged.
114 exam-style questions 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 has a worked solution and a mark scheme showing where the marks go.