Question

which test is done to find out whether CO2 is essential for photosynthesis or not ​

Answer 1

Answer:

Only the leaf that has been exposed to carbon dioxide will photosynthesise and therefore test positive for starch, showing that carbon dioxide is necessary for photosynthesis.

Explanation:

Answer 2

Well

Here is an Activity

Take a plant and cover it's all leaves with a conical flask or any polythene bag so that air cannot come in contact with air and fill potassium hydroxide tablets in each conical flask or polythene bag so that if any air enters potassium hydroxide will absorb CO2 and prevent its contact with CO2. Leave it for few days like this.The plant will not survive as the plant was not able to perform photosynthesis and therefore the plant died.

Please mark as Brainliest