Final answer:
Keeping a plant in darkness causes destarching and etiolation due to lack of light, impacting the plant's ability to produce food and affecting its growth.
Explanation:
Destarch is the correct option when a healthy potted plant is kept in a dark room for some days. This process involves the removal or reduction of starch in the leaves due to lack of light, causing the plant to utilize its stored carbohydrates.
Plants grown in the dark undergo etiolation, where stems elongate, leaves become smaller, and the plant turns white or yellow without sufficient chlorophyll production.
Excessive darkness can lead to plants not being able to produce or store sufficient food, impacting their growth and survival.
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