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1.1 Cell structure

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Question 76

Researchers compared equal-sized sections of sunflower stem. One group of stems had a reduced amount of lignin deposited in the xylem walls.

Water containing the same concentration of dissolved mineral ions was supplied to each stem section at the same pressure.

Amount of lignin depositedXylem vessels remaining open after 1 hour (%)Volume of water moved through the stem in 1 hour (cm³)
Normal964.8
Reduced582.9

Use the data and your knowledge of xylem vessels to explain how reducing lignin deposition affects the transport of mineral ions through the stem.

[4]
Markscheme

1.1 Cell structure Questions

  1. GCSE
  2. /Biology
  3. /1.1 Cell structure

282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.

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