The plant shown in the diagram was left in total darkness overnight and then exposed to strong sunlight for four hours - Junior Cycle Science - Question h - 2006
Question h
The plant shown in the diagram was left in total darkness overnight and then exposed to strong sunlight for four hours. The leaf with the foil was removed from the p... show full transcript
Worked Solution & Example Answer:The plant shown in the diagram was left in total darkness overnight and then exposed to strong sunlight for four hours - Junior Cycle Science - Question h - 2006
Step 1
Clearly state the result you would expect from this test?
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Answer
The area of the leaf that was covered with aluminium foil would remain yellow or orange when tested with iodine, indicating no starch production. In contrast, the uncovered area of the leaf would turn blue-black, indicating the presence of starch.
Step 2
What conclusion can be drawn?
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Answer
This experiment demonstrates that light is essential for the process of photosynthesis, which is necessary for starch (food) production in plants.
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