In an experiment, a leaf was partially covered with black paper, and was exposed to light. On testing these leaves for starch, it was seen that uncovered part turned blue-black. This concludes that photosynthesis had occurred in

Question

In an experiment, a leaf was partially covered with black paper, and was exposed to light. On testing these leaves for starch, it was seen that uncovered part turned blue-black. This concludes that photosynthesis had occurred in (A) green parts of leaves (B) black paper covered part of leaves (C) black part of leaves (D) Both (a) and (b)

Tardigrade Admin · Accepted Answer

Green parts of leaves perform photosynthesis. In the experiment, we see that uncovered part was able to absorb light and starch was synthesised here as the product of photosynthesis. Thus, turned blue-black on dipping in iodine (as iodine react with starch to give this colour).

Q. In an experiment, a leaf was partially covered with black paper, and was exposed to light. On testing these leaves for starch, it was seen that uncovered part turned blue-black. This concludes that photosynthesis had occurred in

green parts of leaves

black paper covered part of leaves

black part of leaves

Both (a) and (b)

Green parts of leaves perform photosynthesis. In the experiment, we see that uncovered part was able to absorb light and starch was synthesised here as the product of photosynthesis. Thus, turned blue-black on dipping in iodine (as iodine react with starch to give this colour).