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Test for Sunlight

The procedure...

Question

The procedure of an experiment is given as: Destarch the given potted plant. Cover a portion of leaf with a strip of black paper and keep it in sunlight for 6 hours. Test the presence of starch in the leaf.

What is the aim of the above experiment?

A

To demonstrate photosynthesis can happen even without sunlight.

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B

To demonstrate that light is necessary for photosynthesis.

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C

To demonstrate starch is formed during photosynthesis.

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D

None of the above.

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Solution

The correct option is B
To demonstrate that light is necessary for photosynthesis.

The aim of the experiment is to demonstrate that light is necessary for photosynthesis. In this process:
(a) The leaf under experiment is plucked from the plant and boiled in alcohol over a water bath. Then, it is treated with iodine solution.
(b) The covered part will be iodine negative while the rest of the part will be positive for the iodine test.

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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 :

Q. A student covered a leaf from a destarched potted plant with a black paper strip and kept the plant in the garden in the morning hours. In the evening he tested the covered portion of the leaf to test the presence of starch. In this case, the student was trying to show that:

Q. A destarched leaf on a potted plant was covered with Black (A) Transparent (B) strips of paper as shown in figure. After 6 hours of exposure to sunlight the leaf was removed from the plant and tested for starch. Which are the following will be the correct observation?

(i) Pluck the leaf to be experimented

(ii) Cover a portion of leaf on both sides by using strips of black paper

(iii) Keep the plant in dark place for three days to destarch its leaves.

(iv) Test the experimental leaf the the presence of starch

(v) Expose the plant to sunlight for four hours

(vi) Remove the black paper strip from the leaf

Given in the box are steps written randomly for the experiment to show that light is essential for photosynthesis. Which of the following sequences of steps is to be followed by the successful run of the experiment?

Q. 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?

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