Biology
The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. Test-tube B contains both a green water plant and a snail. Both test-tubes are kept in sunlight. Answer the questions that follow:
(i) Name the physiological process that releases the bubbles of oxygen.
(ii) Explain the physiological process as mentioned above in Q.2(a)(i).
(iii) What is the purpose of keeping a snail in test-tube 'B'?
(iv) Why does test-tube 'B' have more bubbles of oxygen?
(v) Give an example of a water plant that can be used in the above experiment.
(vi) Write the overall chemical equation for the above process.
Photosynthesis
ICSE 2015
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Answer
(i) Photosynthesis
(ii) Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances (glucose and starch), from carbon dioxide and water, by using light energy. Plants release oxygen as a by-product during photosynthesis.
(iii) The snail respires and releases Carbon dioxide so more Carbon dioxide is available to the plant for photosynthesis.
(iv) Test tube B have more bubbles of Oxygen because the rate of photosynthesis is more in test tube B as the plant gets more CO2 from the snail.
(v) Hydrilla is a water plant which is used for such experiments.
(vi) Balanced chemical equation representing the process of photosynthesis is given below:
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