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Modes of Nutrition
Modes of Nutrition Test #2
| Question | Answer |
|---|---|
| autotrophism | uses inorganic carbon sources (CO2) |
| photosynthetic autotroph | energy source is from light; utilize photosynthetic pigments to trap light; light energy is converted to chemical energy (ATP) ex. all green plants and algae, some bacteria; green and purple sulfur bacteria and cyanobacteria; |
| chemosynthetic autotroph | energy source is from the breakdown of inorganic chemicals ex. some bacteria |
| heterotrophism | requiring organic chemicals as a carbon source |
| photosynthetic heterotroph | use light as energy source; rare mode; ex. few bacteria; green and purple nonsulfur bacteria |
| chemosynthetic heterotrophs | energy source is from the breakdown of organic chemicals; several sources for these organic chemicals: holotrophism, parasitism, and saprophytism |
| holotrophism | ingesting other organisms ex. most animals |
| parasitism | gradually drawing nutrients from a living host organism ex. many bacteria, fungi, protozoa, a few animals |
| saprophytism | digesting dead organism or decaying matter ex. many bacteria and fungi |