- Question 117 marks
Classifying Chlorella: binomial names, eukaryotic cell structures and the kingdoms of living things.
- Question 215 marks
The human gas exchange system, protection of the airways, and pressure and volume changes during breathing.
- Question 318 marks
Filtration and reabsorption in the kidney nephron from data on blood, filtrate and urine.
- Question 411 marks
Species, self-pollination and cross-pollination, and the parts of a flower.
- Question 511 marks
Inheritance of ABO blood groups: codominance, discontinuous variation and a genetic diagram.
- Question 68 marks
The nitrogen cycle: fixation, deamination, nitrification and denitrification.