I: | In diatoms, the cell walls form two thin overlapping shells which fit together as in a soap box |
II: | The walls are embedded with silica and thus are indestructible |
III: | The fossilized diatoms are called diatomaceous earth |
IV: | Diatoms are not the main producers in the oceans |
V: | Diatomaceous earth is used in polishing, filtration of oil and syrups |
Column -I | Column-II |
A. Plasmodium | (i) Diatoms |
B. Mixotrophic nutrition | (ii) Euglenoids |
C. Red tide | (iii) Dinoflagellates |
D. Oceanic chief producers | (iv) Slime moulds |