O-LevelBiologyPlant Nutrition5090/11 · May/June 2019 · Q71 Mark

A plant has leaves with both green and white areas. One of its leaves is partly covered with aluminium foil which blocks light. [Figure 7.1] The plant is then placed under a lamp for 24 hours. After this time, discs are cut from the areas of the leaf shown, and tested with iodine solution. [Figure 7.2] Which of the leaf discs will give a blue-black colour when tested with iodine solution?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AW and X

BX only

CY and Z

DY only

✓ Correct answer

D: Y only

Oracle Prep sorts past-paper questions by topic, so you can drill Plant Nutrition and see which topics are most likely to come up next.

Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2019 Paper 1 Variant 1, question 7.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content