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Test for Carbon Dioxide

Two healthy g...

Question

Two healthy green plants were placed in the dark for 24 hours. They were then set up as shown in the figure and were left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves.

What hypothesis is being tested in this experiment?

A

The hypothesis is that the leaf from plant A do not show starch test while the leaf from plant B turns blue-black showing the presence of starch.

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B

The hypothesis is that plant B would serve as a control.

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C

The hypothesis is that C $O_{2}$ is necessary for photosynthesis is being tested in this experiment.

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D

None of the above

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Solution

The correct option is C
The hypothesis is that C $O_{2}$ is necessary for photosynthesis is being tested in this experiment.

The hypothesis that C $O_{2}$ is necessary for photosynthesis is being tested in this experiment.
The remaining options are not 'hypothesis' being tested in this experiment. The leaf from plant A does not show starch test while the leaf from plant B turns blue-black showing the presence of starch is the result of the final step. The role of KOH in the experiment is used to absorb the carbon dioxide produced by the plant.

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Similar questions

Q. Two healthy green plants were places in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken form each plant and the chlorophyll was removed from the leaves:
(i) What is the next and final step in this experiment?
(ii) What would be the results of the final step?
(iii) Why was it necessary to grease the glass sheet?
(iv) What hypothesis is being tested in this experiment?
Figure

A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it, after which it was placed in sunlight for a few hours. One of the leaves was then plucked and an outline of the leaf making the green and non-green regions were drawn. The leaf was then tested for starch. Using the above information, answer the following question

State the aim of the above experiment.

A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it, after which it was placed in sunlight for a few hours. One of the leaves was then plucked and an outline of the leaf making the green and non-green regions were drawn. The leaf was then tested for starch. Using the above information, answer the following question

Give the chemical equation to represent the process of starch formation in plants.

Q. The steps taken for setting up an experiment to demonstrate that ‘light is necessary for photosynthesis’, were as follows :
• A strip of black paper was clipped on the leaf of a potted plant
• The plant was kept in the sun for four hours
• The strip was removed and the leaf was placed in boiling alcohol in water bath
• The leaf was washed and tested for starch
The result was not as expected. Identify the step which had been missed out :
(1) The plant was kept in the dark for 24 hours before starting the experiment
(2) The leaf was boiled in water after placing it in boiling alcohol
(3) The leaf was sprinkled with water before placing it in black paper strip
(4) A transparent strip was used to cover the black paper strip

Q. Unicellular algae X and Y of the same species were taken and experimentally, chloroplasts were removed from cell X. After some time, they both were kept in bright sunlight for few hours and then iodine test was performed on them. What will be the results ?

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