Answer: Mixotrophic - both modes.
- A Purely parasitic feeding
- B Mixotrophic - both modes
- C Only chemosynthetic
- D Purely saprophytic feeding
Correct answer: B. Mixotrophic - both modes
Explanation: Euglena is mixotrophic: it photosynthesises in sunlight but feeds heterotrophically in the dark.
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.