Question

A potted plant is kept in light for a day and one of its leaves is tested for starch. The same plant is kept in the dark for two days and another leaf is tested for starch. Will there be a difference in the results of the two experiments? Give reasons for your answer.

Answer 1

starch is generally tested with iodine solution. It gives blue-black colour if any starch is present . In photosynthesis CO2+H2O forms C6H12O6 +O2 . The plant when kept in dark then it will not show proper blue black colour because there would be some loss of starch