When a red onion cell is placed in darkness, it undergoes a process called etiolation, where it grows elongated and pale due to a lack of light. The chlorophyll production decreases, resulting in a lack of green coloration, while the cell may rely on stored nutrients for energy. This adaptation helps the plant survive in low-light conditions, promoting upward growth toward a light source. Over time, if light exposure is provided, the cells will start producing chlorophyll and regain their color.
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