During a biology practical at a secondary school in Trinidad, students tested a leaf for starch after exposing it to sunlight for six hours. What is the correct reason for boiling the leaf in ethanol?

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Question

During a biology practical at a secondary school in Trinidad, students tested a leaf for starch after exposing it to sunlight for six hours. What is the correct reason for boiling the leaf in ethanol?

Accepted Answer

To remove the green colour from the leaf — Award 1 mark for stating that ethanol dissolves chlorophyll/removes green pigment. A is incorrect — boiling in water kills the cells, not ethanol. C is incorrect — softening occurs when boiling in water. D is incorrect — ethanol does not convert starch to glucose.

Answer

To kill the leaf cells

Answer

To convert starch to glucose

Answer

To soften the leaf for testing

Answer

To remove the green colour from the leaf

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