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Question:

Which one of the following is incorrect about fungi?

All fungi posses a purely cellulosic cell wall.

They are both unicellular and multicellular.

They are heterotrophic.

They are eukaryotic.

Solution:

Fungi are saprotrophs or parasites (heterotrophic i.e., organisms that cannot synthesize organic compounds and depend on available ones). Fungi can derive their nutrition from live or dead organisms. Yeast is a unicellular fungus, while all other fungi are multicellular. The presence of a chitinous cell wall is a characteristic feature of fungi whereas a cellulosic cell wall is found in plants. Therefore, the correct answer is option A.