KCET Biological Classification — practice questions

Explore 2 free Biological Classification questions in KCET Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Biological Classification questions and exercises with answers

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Whittaker (1969) proposed how many kingdoms in biological classification?Read the answer and worked solution →Halophiles thrive in:Read the answer and worked solution →

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Whittaker (1969) proposed how many kingdoms in biological classification?

3
2
5 (Monera, Protista, Fungi, Plantae, Animalia)
7

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Correct answer: C. 5 (Monera, Protista, Fungi, Plantae, Animalia)

R.H. Whittaker's 5-kingdom system: Monera (prokaryotes), Protista (single-celled eukaryotes), Fungi (multicellular decomposers), Plantae (multicellular photoautotrophs), Animalia (multicellular heterotrophs). Based on cell structure, body organization, mode of nutrition, reproduction, phylogeny.

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Halophiles thrive in:

Hot
Cold
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High salt environments (e.g., salt lakes, salt flats)

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Correct answer: D. High salt environments (e.g., salt lakes, salt flats)

**Halophiles:** salt-loving extremophiles. Live in Dead Sea, Great Salt Lake, brines (>30% NaCl). Mostly archaea (Halobacterium). Use compatible solutes to balance osmotic pressure. Color salterns red/pink (bacterioruberin pigments). **Bacteriorhodopsin:** ATP-generating proton pump driven by light.