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A plant kept in darkness does not show a blue-black colour when iodine is added to its leaf. What is the most correct reason?

Answer and explanation

Correct answer: Starch was not formed in the leaf

The governing concept is the iodine test for starch and the role of light in photosynthesis. Iodine turns blue-black when starch is present. A plant kept in darkness cannot receive the light energy required to drive photosynthesis, so the leaf does not produce enough stored starch for the test. Thus option A is correct. Excess water, absence of xylem and the number of guard cells do not explain the missing iodine colour in this experiment.

Related tags

Starch TestPhotosynthesisLightIodine ExperimentLife ProcessesWorld Of LivingScienceClass 10 Mcq

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