A plant has leaves with both green and white regions. One leaf is partly covered by aluminium foil, so that light cannot reach that part. The plant is then kept under a lamp for 24 hours. After this period, discs are removed from the labelled parts of the leaf shown and tested using iodine solution. Which leaf discs will turn blue-black when iodine solution is added?
- AW and X
- BX only
- CY and Z
- DY only