Amoeba & Protozoans: Movement & Structure — NEET Biology

Which of the following statements about Kingdom Protista are correct? S1: Diatoms have cell walls embedded with silica, making them indestructible, and are considered chief producers in oceans. S2: Dinoflagellates are mostly marine, photosynthetic organisms with stiff cellulose plates on their outer surface and two perpendicularly arranged flagella. S3: Euglenoids possess a protein-rich pellicle for flexibility and exhibit mixotrophic nutrition, being photosynthetic in sunlight and heterotrophic otherwise. S4: Slime moulds are saprophytic protists that form large aggregations called plasmodium under suitable conditions, and their spores possess true walls resistant to adverse conditions. S5: Amoeboid protozoans are exclusively marine organisms that use cilia for locomotion and prey capture. S6: Ciliated protozoans, like Paramoecium, use thousands of cilia for active movement and possess a gullet that opens to the outside of the cell surface to steer food.