question_answer

  The leaf of a destarched plant is covered with black paper strip. After 8 h, starch test is done. In which part will the colour beblue-black?

Answer:

  In 'A' part, the colour will be blue-black. It is because, photosynthesis occurred at uncovered portion results in the formation of starch which gives blue-black colour with starch test i.e., iodine solution.                    (1)