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Test for Sunlight

Which one of ...

Question

Which one of the following is the correct combination of relevant materials required for setting up an experiment to show that light in necessary for photosynthesis?
(1) destarched leaves, strips of black paper, starch solution, and iodine crystals
(2) a potted plant, strips of coloured paper, starch solution, iodine and potassium iodide
(3) destarched leaves, strips of black paper, starch solution, and potassium iodide
(4) destarched leaves, strips of black paper, and iodide solution

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Solution

The correct combination of materials for the above mentioned experiment are -
destarched leaves - to check the synthesis of starch
strips of black paper - to cover the leafs
iodine solution - to check the presence of starch

Hence, the correct answer is option 4.

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Q. A portion of each of four destarched leaves of a plant was covered with paper strips of various kinds. The plant was exposed to sunlight for 5 hours. Thereafter, the strips were removed and the leaves tested for starch in the covered portion. Which one out of the four leaves gave the starch test in the covered portion?
(1) that covered with black paper strip
(2) that covered with green paper strip
(3) that covered with white paper strip
(4) that covered with transparent paper strip

Q. Plant -> Destarched -> Part of leaf covered with black paper strip -> Starch test
These steps prove the importance of in photosynthesis.

Q. Plant -> Destarched -> Part of leaf covered with black paper strip -> Starch test
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Q. A star-shaped figure was cut in the black paper strip used for covering the leaf of a destarched plant used for demonstrating that light is necessary for photosynthesis. At the end of the experiment when the leaf was tested for starch with iodine, the star-shaped figure on the leaf was found to be:

(1) colourless
(2) green in colour
(3) brown in colour
(4) blue-black in colour

Q. A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was exposed to sunlight for six hours and then tested for starch. It was observed that :

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