Diagrammatic question

Dear student, 
a. The objective of this experiment is to study that carbon dioxide is required for photosynthesis. This carbon dioxide turns lime water milky. 
b. No, it won't work satisfactorily because in the given diagram there is no carbon dioxide in the flask, which is needed to carry out the photosynthesis.
c. To obtain the expected results, carbon dioxide should be available for the leaves to carry out the process. 
d. The leaf is destarched before carrying out the experiment so that no amount of starch is present in the leaf beforehand. The leaf is destarched by covering it with paper or strip, or keeping it in the dark place overnight. This step is necessary is to remove any starch that might be present already in the leaf and affect the experiment result.


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