Question

1. to perform the experiment to show chlorophyll is necessary for photosynthesis, a leaf from variegated plant is taken. Why?

Answer 1

so that green colour could be used to explain the process of photosynthesis

Answer 2

Answer:

But colored patches of variegated leaf doesn't include chlorophyll and thus don't prepare starch through photosynthesis. So iodine added in this region will change into brown color. Thus this experiment proves chlorophyll is necessary for leaves to prepare starch through photosynthesis.