| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.SL.TZ0.26 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 26 | Adapted from | N/A |
Question
What is dissolved in blood plasma?
A. carbon dioxide, erythrocytes and platelets
B. amino acids, glucose and urea
C. carbon dioxide, oxygen and heat
D. glycogen, antibodies and urea
Markscheme
B
Examiners report
This proved to be a poor discriminator since all answers were seen in fairly high percentages. Many candidates found this confusing, perhaps from not fully understanding that the question was asking for substances dissolved in plasma, not transported in plasma. Erythrocytes are cellular so not dissolved in solution and heat is not dissolved either.
Syllabus sections
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