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What is meant by “Thallus organization” in Whittaker's five-kingdom classification?

Answer and explanation

Correct answer: Structural complexity of the body

In the context of Whittaker’s classification, thallus organization refers to the level and structural complexity of an organism’s body. A thallus is a relatively undifferentiated body that does not show the specialized root, stem, and leaf organization of higher plants. The idea helps distinguish simple unicellular forms from multicellular organisms whose cells may form tissues and more complex body structures. Therefore option B, structural complexity of the body, is the best answer. Cell size, option A, is only a physical measurement and does not describe organization. Nutrition and reproduction are also important criteria in five-kingdom classification, but they are separate characteristics, not the meaning of thallus organization. Thus the term concerns body construction and degree of differentiation.

Related tags

ThallusWhittakerFive-Kingdom-ClassificationBody-OrganizationBiodiversityAnd Classification SystemsBiodiversity And Classification SystemsThe Living WorldBiology

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