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If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

1. nature of stored food materials in the cell
2. structural organization of thallus
3. chemical composition of the cell wall
4. types of pigments present in the cell

Correct answer: types of pigments present in the cell

Solution

Algae are classified into distinct groups mainly by their pigment composition, because different pigments give them characteristic colors and reflect evolutionary differences. Stored food, thallus organization, and cell wall chemistry can vary, but pigments are the key grouping feature.

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