Question

an activity on showing water is necessary for photosynthesis​

Answer 1

Answer:

Use a hydrogen isotope labelled water to see that the water is split in the photolysis reaction. Then track the hydrogen ions to see where they end up in the plants. NADPH transfers to the Calvin cycle step of photosynthesis and provides the hydrogen to build the CO2 into an organic molecule.

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Answer 2

Answer:

The leaf detached from the plant kept under bell-jar, does not give positive test for starch when kept in iodine solution, whereas the leaf detached from the plant kept under bell-jar B gives positive starch test and becomes blue-black in colour, in iodine solutions.

Explanation:

The KOH solution kept under bell-jar ‘A’ absorbs all the carbon dioxide, ceases the process of photosynthesis and starch formation. This experiment proves the necessity of the carbon dioxide for photosynthesis.