Question

a) Arun carried out the following experiment with a croton (variegated) leaf. He drew the leaf in his notebook
marking the green and the non-green areas. He put the leaf in hot alcohol till all the green colour came out and
the leaf turned white. He then washed the leaf in water and covered the leaf in iodine solution.
i. What was the colour change in iodine solution?
ii. Which portions of the leaf show colour change?
iii. Why is it important to bleach the leaf (turning white on removal of chlorophyll)?
iv. What can you conclude from this experiment?

Answer 1

Explanation:

a) Arun carried out the following experiment with a croton (variegated) leaf. He drew the leaf in his notebook

marking the green and the non-green areas. He put the leaf in hot alcohol till all the green colour came out and

the leaf turned white. He then washed the leaf in water and covered the leaf in iodine solution.

i. What was the colour change in iodine solution?

ii. Which portions of the leaf show colour change?

iii. Why is it important to bleach the leaf (turning white on removal of chlorophyll)?

iv. What can you conclude from this experiment?