a bacterium that bears flagella oll over the surface is called

1. lophotrichous
2. cephalotrichous
3. peritichous
4. amphrtrichuos

The correct option is 3.
Peritrichous bacteria have flagella projecting in all directions (e.g., E. coli).
In certain large forms of Selenomonas, more than 30 individual flagella are organized outside the cell body, helically twining about each other to form a thick structure (easily visible with the light microscope) called a "fascicle". Other bacteria, such as most Spirochetes, have two or more specialized flagella (endoflagella) arising from opposite poles of the cell, which together constitute the so-called "axial filament" that is located within the periplasmic space between the flexible cell wall and an outer sheath. The rotation of the axial filament relative to the cell body causes the entire bacterium to move forward in a corkscrew-like motion, even through material viscous enough to prevent the passage of normally flagellated bacteria.