In the experiment to show that sunlight is necessary for photosynthesis
(a) What is done to destarch the green leaves of the potted plant initially?
(b) What is done to a part of destarched leaf so that photosynthesis may not take place in that part of the leaf (before keeping the potted plant in sunlight)?
(c) How is chlorophyll removed from the green leaf before further testing?
(d) Which reagent is used to test the presence/absence of starch in the parts of experimental leaf?
Answers
Explanation:
(a) Green leaves in the potted plant can be destarched when it is kept in dark place for two to three days. The leaves can be tested to see whether it is destarched. If the leaves turn black-blue, then the result is positive.
(b) One of the parts of leaves should be covered with a black paper strip. We need to ensure that both sides of the leaf are covered.
(c) Chlorophyll is removed from the leaf when it is boiled in alcohol water. This is because of the reaction between the blue-black colour formed and the green colour of the leaf.
(d) Iodine solution is used to identify the presence/absence of starch.
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