A-LevelBiologyTransport in plantsOct/Nov 2009Paper 1 Q261 Mark

Which description states some of the features of xylem vessels?

Q: What topic does this question test?

This question tests Transport in plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

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: contains elongated cells with end walls broken down, located in vascular bundles in the stem and centrally in the roots

📋 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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Biology Question

Topic

This multiple-choice question tests Transport in plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2009 examination, Paper 1 Variant 2.

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