Explanation:
To prove the necessity of carbon dioxide in photosynthesis following steps need to do
Insert a part of the leaf of a destarched plant into a conical flask containing potassium hydroxide.
<u>Potassium hydroxide solution</u> absorbs the carbon dioxide gas from the air present in the glass bottle.
Leave the plant sunlight.
After few hours, perform a starch test to this and another leaf of the same plant.
<u>Observation</u>-
Leaf exposed to the atmosphere are bluish black.
Leaf exposed to KOH does not change to blue-black colour
<u>Result</u>- Starch is present in the green part of the leaf.
<u>Conclusion</u>- Presence of starch proves that chlorophyll is necessary for photosynthesis as it traps sunlight.
