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Biology · 2016 · May · Paper 3 · SL · Markscheme

BiologyMarkscheme2016SLMay

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This markscheme is listed under Biology in the 2016 examination archive. Its catalogue level is SL. The catalogue session is May. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.

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M16/4/BIOLO/SP3/ENG/TZ0/XX/M 19 pages Markscheme May 2016 Biology Standard level Paper 3 – 2 – M16/4/BIO LO/SP3/ENG/TZ0/XX/M Section A Question Answers Notes Total 1. a i a. 0.28 «moles dm–3» Allow answers in the range of 0.27 to 0.29 «moles dm–3». 1 b. 0.56 «osmoles dm–3» Allow answers in the range of 0.55 to 0.57 «osmoles dm–3». ii a. «any» part of the line above 0 percent change in mass Allow ECF for upper value of molarity . 1 max b. 0 to 0.28 molarity of NaCl solution iii a. too few samples weighed Differentiate between errors and mistakes eg : do not accept “balance read incorrectly” . 1 max b. not dried before weighing c. samples from different sources Do not accept mass/weight differences. d. not cut all same way so different surface area e. temperature of each sample not the same f. potatoes not left for the same time in the solutions g. error due to the limita tion of the apparatus/equipment b a. at the peak the sodium channels close Accept Na+ and K+ ions. Award [2 max] if answer refers to part of graph before X. 3 max b. the potassium ch annels open c. potassium ions flow out d. repolarization occurs e. delay in closing of potassium channels f. hyperpolarization results g. sodium and potassium pump re- starts to restore ions to resting/previous potentials/concentrations                  
File information
Subject
Biology
Document type
Markscheme
Year
2016
Session
May
Level
SL
Paper
3
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
1.9 MB
Pages
19
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