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Question
Given alongside is the diagram of an experimental set-up:
- What is the objective of this experiment?
- Will it work satisfactorily? Give reason.
- What alteration(s) will you make in it for obtaining expected result?
- Would you take any steps before starting the experiment? Describe this step and explain its necessity.
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Solution
- To demonstrate the importance of carbon dioxide in photosynthesis.
- No, the experiment will not work satisfactorily, as the beaker contains lime water and not potassium hydroxide to absorb CO2.
- Place potassium hydroxide in the beaker instead of lime water.
- The plant must be kept in complete darkness for 48 hours in order to destarch its foliage prior to commencing the experiment. The reason for this is that the experiment will yield false results if the plant is not destarched, as the leaf deposited in the beaker may contain starch that was previously stored, even if no starch is produced during the experiment.
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RELATED QUESTIONS
The diagram is set up to demonstrate an experiment. Pond weed was placed in five water-filled tubes. The experiment was set up as shown in the diagram. The tubes were then left for 24 hours. Write the correct answer out of the five available choices:
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(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5
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Destarching of the leaves of a potted plant can occur only at night.
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Name one natural element which all the organisms 2-4 and even 5 are getting from No. 1 for their survival.
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