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Test for Sunlight

Plant - gt;...

Question

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

A

chlorophyll

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B

sunlight

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C

carbon dioxide

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D

oxygen

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Solution

The correct option is B sunlight
To show that sunlight is essential for photosynthesis to occur: A potted plant is destarched. Part of a leaf in this plant is covered with a strip of black paper and placed in the sun. After a few hours, starch test is performed on this leaf. It is observed that only the parts of the leaf that were exposed to the sun are blue black. This indicates that sunlight is responsible for the production of starch.

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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. A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was then exposed to sunlight for six hours and then tested for starch. It was observed that:
(1) both covered and uncovered parts of leaf turned blue-black
(2) both covered and uncovered parts of leaf turned yellow-brown
(3) only the uncovered part of leaf turned blue-black
(4) only the covered part of leaf turned blue-black

Q. How does carbon dioxide return to the atmosphere? Explain.
A student in order to study the importance of certain factors of photosynthesis took a potted plant and dept it in the dark for over 24 hours. Then in the early hours of the morning the student covered one of the leaves with black paper in the centre only. Student placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch.
(i) What aspect of photosynthesis was being investigated?
(ii) Is there any control in this experiment? If so, state the name.
(iii) Why was the plant kept in the dark before the experiment?
(iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch.

Q. A potted destarched plant was taken in order to prove that light is necessary for photosynthesis.
(i) What is meant by 'destarched plant'? How can it be destarched?
(ii) Using the destarched plant describe step by step how you would proceed to prove that in the absence of light the leaf cannot manufacture starch.

Q. 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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