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2.2 The challenges of size

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Question 35

A courgette plant has mature leaves and a developing fruit. Two transport tissues, X and Y, run through the stem between the leaves and the fruit.

Researchers interrupted one of the tissues without damaging the other. They measured the mean rate at which dissolved sugar entered the fruit.

TreatmentMean rate of dissolved sugar entering the fruit (mg per hour)
Neither tissue interrupted46
Tissue X interrupted4
Tissue Y interrupted44

Use the data to explain which tissue is the phloem and how keeping this tissue interrupted would affect the increase in mass of the fruit.

[4]
Markscheme

2.2 The challenges of size Questions

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

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.

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