Answer: Cyanobacteria (Eubacteria).
- A Archaebacteria (Archaea)
- B Cyanobacteria (Eubacteria)
- C Chrysophytes (golden algae and diatoms)
- D Slime moulds (Myxomycota)
Correct answer: B. Cyanobacteria (Eubacteria)
Explanation: Cyanobacteria (blue-green algae), classified under eubacteria within Monera, are photosynthetic prokaryotes with chlorophyll a and a rigid cell wall; some filamentous forms like Nostoc and Anabaena fix nitrogen using heterocysts.
Whittaker's five-kingdom system (1969) groups all cellular life by cell structure and nutrition; viruses, viroids, and lichens fall outside this system entirely since they aren't independently classifiable as one of the five.
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.