A-LevelBiologyTransport in plantsOct/Nov 2009Paper 1 Q261 Mark
Which description states some of the features of xylem vessels?
Acells joined to form a tube, pits at intervals, sieve plates between cells, surrounded by the
endodermis in roots
Bcontains cells joined end to end, containing peripheral cytoplasm, cell walls with secondary
thickening of lignin, located to the outside of phloem in vascular bundles
Ccontains elongated cells with end walls broken down, located in vascular bundles in the stem
and centrally in the roots
Ddead elongated cells, lignified cell walls with pits at intervals, associated with companion
cells in the roots only
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of transport in plants within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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