In the following set-up the leaf was destarched by keeping it in dark overnight. The bottle contains a solution of Pyrogallol. After exposing the set-up to sun light for a few hours, the entire leaf was tested for the presence of starch by iodine test.

Choose the option(s) showing correct observation(s). 

This is a multiple-correct question, and the correct options are (b) and (c). Pyrogallol solution absorbs oxygen, not carbon dioxide (a $$\text{CO}_2$$ absorber such as KOH would be needed to stop photosynthesis). Photosynthesis needs light, $$\text{CO}_2$$ and water but not external oxygen, so both the enclosed part and the outer part of the leaf make starch and give a positive iodine test. Options (a) and (d) are therefore wrong.