Question

why it is important to spread leafon white tile not on a coloured tile during startch test

Answer 1

Answer:

Removes the waxy cuticle which prevents entry of iodine/potassium iodide solution. Ruptures cell membranes to make starch granules in cytoplasm and chloroplasts accessible to iodine/potassium iodide solution.

Explanation:

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Answer 2

Answer: The white tile allows the colour change in the part of the leaf containing to be clearly seen.

Explanation: White reflects back all the visible wavelength of light that falls or shines on them. This causes any object on their surfaces to be seen clearly. On the other hand, coloured objects, absorb some of the wavelengths and reflect back the rest.