- A Two flagella, one lateral and one longitudinal, with stiff cellulose plates on the cell wall
- B Largely absent flagella combined with a chitinous exoskeleton-like cell wall structure
- C Locomotion mainly by amoeboid movement using extending pseudopodia structures
- D An infectious spore-forming stage characteristic of their typical parasitic life cycle
Correct answer: A. Two flagella, one lateral and one longitudinal, with stiff cellulose plates on the cell wall
Explanation: Dinoflagellates are mostly marine and photosynthetic, bearing two flagella (one lateral, one longitudinal) and a cell wall with stiff cellulose plates. Some, like Gonyaulax, cause red tides.
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.