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Test for Oxygen

A student cov...

Question

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

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Solution

Photosynthesis is a process in which green plants use light energy to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
So the correct option is
(d)Light is necessary for photosynthesis

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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. 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
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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
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(4) blue-black in colour

Q. When asked to set up an experiment to show that ‘light is necessary for photosynthesis’, a student ran to the school garden and set up the experiment by using a plant growing in the school garden. The experiment failed. His classmates made the following suggestions to get success in the experiment:
Student A : Safranin should be used instead of iodine
Student B : The leaf should not be boiled in alcohol to remove chlorophyll before testing for starch
Student C : Transparent paper should be used instead of black paper strip.
Student D : The leaf should be destarched before starting the experiment
The correct suggestion is given by :
(1) student A
(2) student B
(3) student C
(4) student D

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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