Five-Kingdom Classification · NCERT Biology

Whittaker’s system improved on Linnaeus’s system primarily by accounting for:

  1. The colour and external appearance of the organism
  2. The natural habitat and ecological niche occupied
  3. Complexity of cell structure and mode of nutrition
  4. The presence or absence of a vertebral column
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Correct answer: Complexity of cell structure and mode of nutrition

Whittaker introduced cellular complexity (prokaryotic vs eukaryotic) and nutritional modes as fundamental criteria, which the Linnaean two-kingdom system lacked.

Difficulty: Medium Question 20 of 20

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