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Answer :
When a geranium leaf from a plant growing in sunlight is stained with iodine, a specific reaction occurs. Iodine is commonly used to detect the presence of starch in plants. Starch, a complex carbohydrate, is produced during photosynthesis, which requires sunlight.
If we stain a geranium leaf from a sunlit plant with iodine, we would expect to observe a dark blue-black color appearing on the leaf.
This color change indicates the presence of starch, as iodine reacts with starch to produce this distinctive color. The geranium plant, being exposed to sunlight, undergoes photosynthesis and produces starch.
However, if we place a geranium plant in a dark cupboard for a week and stain a leaf from that plant with iodine, the outcome would be different.
x qsw In the absence of sunlight, the geranium plant cannot undergo photosynthesis and generate starch. Consequently, the leaf would not exhibit a dark blue-black color change. Instead, it would remain unaffected, indicating the absence of starch.
In conclusion, staining a geranium leaf from a sunlit plant with iodine would result in a dark blue-black color due to the presence of starch produced through photosynthesis.
Conversely, if a geranium plant is deprived of sunlight and a leaf is stained with iodine, no color change would occur as there would be no starch present, reflecting the absence of photosynthesis.
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