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Photosynthesis

can a red or ...

Question

can a red or green colour cloth be used to cover a portion of a leaf instead of a black one inorder to prove that light is necessary for photosynthesis ?

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Solution

Black color absorbs all light falling on it. It does not reflect any or allow any light to pass through it. The idea of covering leaves in a photosyntheis experiment is to not allow any light to fall on the leaf and study its effect. If we use green or red colored cloth, they will absorb some and reflect some wavelengths of light. Thus an absolute no light condition will not be created and hence the results will not be as expected.

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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. On completion of the experiment to demonstrate that ‘Light is necessary for photosynthesis’, four students reported the inference as follows. Identify the correct inference:
(1) Part of the leaf covered with strip can only undergo photosynthesis.
(2) Uncovered part of the leaf cannot synthesise starch
(3) Photosynthesis takes place only in the presence of sunlight
(4) Light is necessary for the synthesis of starch in green plants.

Q. A student covered a leaf of a de-starched plant with a black paper strip and kept it in the garden outside his house in fresh air. In the evening, he tested the covered portion of the leaf for the presence of starch. By doing so the student was trying to show that :
(a)

C O_{2}

is given out during respiration
(b)

C O_{2}

is necessary for photosynthesis
(c) Chlorophyll is necessary for photosynthesis
(d) Light is necessary for photosynthesis

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. A variegated leaf with green and yellow paths in used for an experiment to prove that chlorophyll is required for photosynthesis. Before the experiment, the green portions

(A)

, and the pale yellow portions

(B)

, are observed. What will be the color of

^{'} A^{'}

just before and after the starch test? Also, write the equation of photosynthesis and mark well as validate from which molecule the by-product is obtained.

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