The diagram given below represents an experiment to demonstrate a particular aspect of photosynthesis. The letter ‘A’ indicates a certain condition inside the flask. Answer the questions: The diagram given below represents an experiment to demonstrate a particular aspect of photosynthesis. The letter ‘A’ indicates a certain condition inside the flask. Answer the questions:
What is the special condition inside the flask?
Topic: Condition inside the flask
Try it
Pick an option and check your answer. The full worked answer is below either way.
Answer
(b) Air inside the flask is free of carbon dioxide..
The KOH has absorbed all the carbon dioxide, so the air around the enclosed leaf is FREE OF CARBON DIOXIDE. That is the condition marked ‘A’ in the diagram.
KOH absorbs carbon dioxide only — it does not affect oxygen or nitrogen, so options (a) and (c) are wrong. Option (d) is vague and means nothing precise.
Since photosynthesis needs carbon dioxide as a raw material, a leaf in this flask cannot make any food, and therefore no starch — which is what the starch test in part (iv) goes on to demonstrate.
Air inside the flask is free of carbon dioxide..