Question

Consider the leaf of a plant shown in the figure below:

After destarching the plant, it was partially covered with a lightproof paper (as shown in the figure above), and the entire plant kept in the sunlight for 3-4 hours. After this, the starch test was carried out on the leaf. Which of the following would the leaf appear like at the end of the starch test?

• A. a
• B. b
• C. c
• D. none of these

Answer 1

The correct option is B

b

Part that was covered with black paper will appear brown due to absence of starch; similarly non-green part of the leaf would appear brown. The green parts of the leaf will appear blue-black, since they were able to produce starch