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Question
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:
- Name the factor studied in this experiment.
- What will you observe in the experimental leaf after the starch test?
- Explain the process of photosynthesis.
- Give a balanced chemical equation to represent the process of photosynthesis.
- Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.
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Solution
- The factor studied in this experiment is Sunlight.
- It will be observed that only the parts of the leaf that could get sunlight turn blue-black, and the parts covered with black paper do not turn blue, as they could not synthesise starch.
- Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances (glucose and starch) from carbon dioxide and water, using light energy. Plants release oxygen as a by-product during photosynthesis.
- \[\ce{6CO2 + 12H2O ->[Light energy][Chlorophyll] C6H12O6 + 6H2O + 6O2\uparrow}\]
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