| A | B |
|---|
| CHEMOTROPH | MUST OBTAIN ENERGY FROM OXIDATION-REDUCTION OF ORGANIC COMPOUNDS |
| PHOTOTROPHS | CAN USE LIGHT ENERGY |
| AUTOTROPH | CAN DRAW CARBON FROM CARBON DIOXIDE |
| HETEROTROPH | OBTAINS CARBON FROM ORGANIC COMPOUNDS |
| PHOTOAUTOTROPH | LIGHT ENERGY, CARBON FROM CO2 |
| PHOTOHETEROTROPHS | LIGHT ENERGY, CARBON FROM ORGANIC COMPOUNDS |
| CHEMOAUTOTROPHS | ENERGY FROM CHEMICAL COMPOUNDS, CARBON FROM CO2 |
| CHEMOHETEROTROPHS | ENERGY FROM CHEMICAL COMPOUNDS, CARBON FROM ORGANIC COMPOUNDS |
| NITROGEN-FIXING BACTERIA | DRAW NITROGEN GAS FROM THE ATMOSPHERE & ADD IT TO THE SOIL |
| ORGANISM THAT CANNOT GROW WITHOUT OXYGEN | OBLIGATE AEROBE |
| ORGANISM THAT TOLERATES THE PRESENCE OF OXYGEN BUT DOES NOT USE IT AT ALL | AEROTOLERANT MICROBE |
| ORGANISM WITH METABOLIC ENZYMES THAT ALLOW IT TO USE OXYGEN IF IT IS PRESENT, BUT ALSO TO GROW WELL WITHOUT IT | FACULTATIVE ANAEROBE |
| ORGANISM THAT REQUIRES A SMALL AMOUNT OF OXYGEN, LESS THAN ATMOSPHERIC | MICROAEROPHILE |
| ORGANISM THAT REQUIRES SOME SPECIAL NUTRIENT OR COMBINATION OF NUTRIENTS THAT MOST MICROBES DO NOT REQUIRE | FASTIDIOUS MICROBE |
