- A It did not distinguish eukaryotes from prokaryotes, unicellular from multicellular, or photosynthetic from non-photosynthetic organisms
- B It mistakenly placed every known bacterial species directly within kingdom Animalia alongside multicellular animals in most cases
- C It systematically and largely excluded flowering angiosperm plants from being classified within kingdom Plantae under typical conditions
- D It relied mainly on molecular DNA sequencing data that was technologically unavailable at the time it was first proposed according to standard textbooks
Correct answer: A. It did not distinguish eukaryotes from prokaryotes, unicellular from multicellular, or photosynthetic from non-photosynthetic organisms
Explanation: The two-kingdom system failed to distinguish between prokaryotes and eukaryotes, unicellular and multicellular organisms, and photosynthetic (green algae) and non-photosynthetic (fungi) organisms, all of which were grouped together as plants.
Concept context
Whittaker's five kingdom system covering Monera, Protista, Fungi, plus viruses, viroids, and lichens. A foundational NEET chapter on how living organisms are grouped.