Question

In which of the following option is the given steps are correctly arranged?

i. Part of leaf-covered with black paper strip
ii. Starch test is performed
iii. Plant is exposed to sunlight
iv. Plant is destarched

• A. i $\to$ ii $\to$ iii $\to$ iv
• B. iv $\to$ ii $\to$ iii $\to$ i
• C. iv $\to$ iii $\to$ ii $\to$ i
• D. iv $\to$ iii $\to$ i $\to$ ii

Answer 1

The correct option is D iv $\to$ iii $\to$ i $\to$ ii

To show that sunlight is essential for photosynthesis to occur: A potted plant is first destarched. Part of a leaf in this plant is covered with a strip of black paper and placed in the sun. After a few hours, the starch test is performed on this leaf.
It is observed that only the parts of the leaf that were exposed to the sun, turn blue-black. This indicates that sunlight is responsible for the production of starch.