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What was the main reason for separating Fungi from plants in the Five-Kingdom system?

Answer and explanation

Correct answer: Heterotrophic nutrition and chitinous cell wall

Fungi were separated from plants in Whittaker’s Five-Kingdom system because their fundamental biological features are different. Fungi are heterotrophic: they cannot prepare food by photosynthesis and usually obtain nutrients by secreting enzymes and absorbing dissolved substances. Their cell walls are mainly made of chitin, whereas the cell walls of typical plants are mainly made of cellulose. These differences are more important for classification than simply comparing size or visible appearance.

Thus, B is correct: fungi have heterotrophic nutrition and chitinous cell walls. “Lack of reproduction” is wrong because fungi do reproduce, often by spores or other methods. Mobility is not the main reason, since many fungi are non-motile and plants are also generally non-motile. Cell size varies widely and does not define the kingdom. Their nutrition and cell-wall composition show why fungi form a separate kingdom.

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FungiSeparation

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