Indicate whether each of the following is true (T) or false (F).

A The presence of starch in the iodine test is confirmed by the appearance of brown colour. B During photosynthetic experiments, methylated spirit is used to decolourise the chlorophyll pigments. C The aquatic plant that is frequently used in experiments to verify the presence of oxygen is Hydrilla. D The chemical used in the test for carbon dioxide is potassium carbonate.

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Solution

The presence of starch in the iodine test is confirmed by the appearance of blue colour. Hence statement 1 is false.

During photosynthetic experiments, the methylated spirit is used to decolourise the chlorophyll pigments. Hence statement 2 is true.

The aquatic plant that is frequently used in experiments to verify the presence of oxygen is Hydrilla. So statement 3 is true.

The chemical used in the test for carbon dioxide is potassium hydroxide. Hence statement 4 is false.

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