A-LevelBiologyTransport in plants9700/12 · May/June 2012 · Q261 Mark
Sucrose is transported in solution in the phloem of plants. Transport takes place from sources to sinks. The process depends on differences in hydrostatic pressure between the sources and the sinks. [Figure 26.1] Which tissues are either a source or a sink and what is the hydrostatic pressure at X and Y within the phloem?
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Aleaf: sink, root: source; high hydrostatic pressure: X, low hydrostatic pressure: Y
Bleaf: sink, root: source; high hydrostatic pressure: Y, low hydrostatic pressure: X
Cleaf: source, root: sink; high hydrostatic pressure: X, low hydrostatic pressure: Y
Dleaf: source, root: sink; high hydrostatic pressure: Y, low hydrostatic pressure: X
✓ Correct answer
C: leaf: source, root: sink; high hydrostatic pressure: X, low hydrostatic pressure: Y
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