n Eutrophication, excess nutrients can cause algal blooms. However, what happens when the algae eventually die? Bacterial – Increase or decrease Oxygen – Increase or decrease

Refer to the description and table below to answer the three question that follow: Dissolved oxygen levels from 3 bottles of algae were recorded. The DO level of bottle #1 was recorded immediately after the algae was collected, the DO level of bottle #2 was recorded after sitting for 20 hours wrapped in tin-foil, and the DO level of bottle #3 was recorded after sitting for 20 hours under a lamp. A heat sink was placed over all of the bottles to ensure that temperature did not have an effect on the results. The following data was collected: Bottle Number D.O. Level 8 #1 #2 1 #3 6 4. How many units of oxygen were used for cell respiration by the algae? a. 7 b. 2 c. 5 d. -2

An over growth of microbes can decrease dissolved oxygen levels to the point where organisms cannot survive True or false ?

Waterborne microorganisms can survive in water with small amounts of nutrients but thrive in polluted water, which is rich in nutrients. Why do you think that polluted water is considered rich in nutrients?

Microbes which feed on dead organic material are classified as:     pathogens     parasites     saprophytes     autotrophs

If you are working at a sewage treatment plant, which microbial process(es) would you use to reduce nitrates in sewage before releasing into rivers? Why? denitrification; to reduce occurrence of HAB's nitrification; to make water richer in fertilizers when used by farmers nitroge fixiation; to increase dissolved oxygen in river water nitirification to convert nitrates to unusable nitrites; to increase algal growth in water

A fish living in a shallow lake is : photoheterotroph / photochemotroph / chemoheterotroph

Which group of microorganisms requires high osmotic pressure to survive? Osmolyphiles Facultative halophiles Obligate halophiles Acidophiles Obligate halophiles AND Osmolyphiles

Denitrification occurs under:     anaerobic conditions     aerobic conditions     both aerobic and anaerobic conditions

DDT is a persistent environmental pollutant once widely used as an insecticide. Using solubility principles, explain why shore birds that populate areas sprayed with DDT are found to have a high concentration of DDT in their tissues.