Look at the picture and answer the questions that follow:

1. Identify the activity for which this set is required.
2. Which liquid is being added to the leaf?
3. What happens to the part of leaf covered with black paper? What does this indicate?

1. It is used to show that light is necessary for photosynthesis.
2. Iodine solution is added to the leaf.
3. The part of the leaf covered with the black paper does not turn blue-black after adding iodine solution. This indicate that there is no starch formed in that area since no photosynthesis took place because that area of leaf was kept devoid of light. Hence, this activity proves that light is essential for photosynthesis.