Answer :
Final answer:
The geranium leaf experiment demonstrates that light is necessary for photosynthesis. The absence of starch in the leaf when kept in the dark, and its presence after exposure to light, shows that photosynthesis requires light.
Explanation:
The demonstration with the geranium leaf in a biology class illustrates the process of photosynthesis, providing evidence that light is necessary for this process to take place. In the experiment, a geranium leaf is kept in the dark to inhibit photosynthesis. The leaf is then tested for the presence of starch. The expectation is there will be no starch (or less) because without light, the photosynthesis process – in which plants convert light energy, water, and carbon dioxide into glucose (starch) and oxygen – was impaired. When the leaf is exposed to light and the test is repeated, the presence of starch should be prominent, proving that light is essential for photosynthesis.
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