According to Whittaker, which structures may be used for locomotion by organisms in Kingdom Protista?

Correct answer: Cilia, flagella and pseudopodia

The correct answer is B. Protists are mostly unicellular eukaryotes, and different protists use different structures for movement. Paramecium moves with many short cilia, Euglena swims with a flagellum, and Amoeba moves by forming temporary projections called pseudopodia. Thus, the complete answer includes cilia, flagella and pseudopodia. Option A is incomplete because it mentions only cilia and leaves out the other two common methods. Option C describes familiar structures of larger animals, not the characteristic locomotory structures listed for these protists. Option D is wrong because several protists clearly possess locomotory structures. Memory cue: Amoeba—pseudopodia, Paramecium—cilia, Euglena—flagellum.