The diagram illustrates an experiment designed to determine whether carbon dioxide is required for photosynthesis. The plant is left in darkness for 48 hours so that any starch is removed. It is then arranged in the light, as shown. After 10 hours, leaves X and Y are tested for starch. What result is expected?
- AStarch present in leaf X and present in leaf Y
- BStarch absent in leaf X and absent in leaf Y
- CStarch present in leaf X and absent in leaf Y
- DStarch absent in leaf X and present in leaf Y