Question

7. Which is false? a. Photoheterotrophic microorganisms that use photoenergy, but depend on organic matter as a carbon source, are abundant and widespread b. Algae are photoautotrophs c. Some bacteria, such as cyanobacteria, photosynthesize d. All fungi and protozoans are chemoheterotrophs e. Chemoautotrophic microorganisms use CO2 for biomass and oxidize substances such as NH4+ for energy

Answer 1

a) False: Photoheterotrophic microorganism like Synechococcus and Prochlorococcus use sunlight for synthesis but cannot capture CO2 so are dependant upon orgaic matter and they are not abundant and widespread

b) True: Algae capture sunlight and can convert CO2 and H2O to organic matter by photosynthesis and so are photoautotrophs

c) True : cynobacteria also known as blue green algae can carry out photosynthesis

d) Chemoheterotrophs are not able to utilize CO2 as source of carbon (organic matter) and are depedant upon carbohydrates, proteins or sulphur etc. Yes all fungi and protozoans are chemoheterotrophs

e) True: Chemoautotrophic microorganisms use CO2 for biomass and oxidize substances such as NH4+ for energy