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Mark Scheme

Page 5 of 7

Unit Code

Session

Year

2803/01

January

2001

Version Final

Abbreviations, annotations and conventions used in the Mark Scheme

/ ; NOT )

ecf AW ora

= alternative and acceptable answers for the same marking point = separates marking points = answers which are not worthy of credit = words which are not essential to gain credit = underlining) key words which must be used to gain credit = error carried forward = alternative wording = or reverse argument

(f)

xylem transports water / ‘carries’ water to leaves; transpiration / evaporation, pulls water up (xylem); this (evaporation) occurs from, leaves / stomata / aerial surfaces; blockage of vessels stops upward movement / AW; water lost is not replaced / transpiration still occurs; cells not turgid (hence wilting); AVP; e.g. lack of Mg or Fe gives yellowing / leaf death

3 max

[Total:

16]

Mark Scheme

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