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2 marksTransport in the Phloem

CAPE Biology Unit 2 · 2005 · Paper 2 · Question 7(b)(i)

A young bean seedling has two cotyledons, two developing leaves, and one root. A sweet potato vine has a long stem, 40 mature leaves, and four large underground tubers.

State concisely the pressure flow hypothesis, clearly distinguishing between a source and a sink.

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Other parts of this question

  1. 7(a)With specific reference to the cells, explain how the structure of phloem is related to its function.[10 marks]
  2. 7(b)(ii)Identify the sources and sinks in the bean seedling and in the sweet potato vine.[4 marks]
  3. 7(c)With reference to the bean seedling, outline the pathway a water molecule would take from the soil solution to the atmosphere via the xylem.[4 marks]

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