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A student testing the hypothesis that carbon dioxide is an indispensable factor for photosynthesis, places a pelargonium plant under a jar where air is enriched with carbon dioxide and he covers the jar with an opaque cover. Ten hours later, when the leaves are treated in hot alcohol and iodine water, they show yellow coloration. a. What does this coloration indicate? What conclusion can be drawn? b. The student does not expect this result. Help him find the error that he has committed while experimenting.
Sagot :
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