Answer :

Final answer:

The geranium plant was placed in a dark cabinet to demonstrate etiolation, a phenomenon where plants deprived of light grow taller and have a pale coloration.

Explanation:

The geranium plant was likely placed in a dark cabinet for 5 days to demonstrate the effects of lack of light on plant growth, a concept known as etiolation. This phenomenon occurs when a plant is deprived of light, causing it to grow taller and have a pale coloration as it tries to reach for a light source. In a biological experiment analogous with germinating tobacco seeds in different light conditions, this step is crucial to show the initial impact of dark conditions on plant development before exposing them to light.

Learn more about Etiolation here:

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