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Multiple-choice excercise
BOD means: - Biochemical oxygen demand is a measure that show the amount of oxygen used in microbiological activity.
- Biological oxygen deficit is a measure that show oxygen depleetion in the blood of vertebrates.
- Biological oxygen demand is a measure that show the amount of oxygen that is needed in the decomposing process of organisms.
Eutrophication is: - A process which increases growth of plants in the water due to high loads of nutrients.
- A process which increases growth of fishes in the water due to high loads of nutrients.
- A process which decrease growth of plants in the water due to high loads of bluegreen toxic algae.
N, P and K means: - Nitrogen, Phosphorous and a constant for oxygen.
- Nitrogen Phosphorous and Potassium.
- Nitrogen, Potassium and cat ion content.
Redfield ratio is: - The relation of 16 atoms of Nitrogen for 1 atom phosphorous needed for algal growth.
- A theory by J.B. Redfield which describe the number of eggs produced by trout in relation to nitrogen concentration in the water.
- A value that describe the relation between nitrogen and oxygen above the halocline in pelagic water systems.
How does car traffic increase eutrophication? - In the combustion process nitrogen oxide is leaked to the athmosphere and nitrogen is a nutrient which can trigger eutrophication.
- In the combustion process lead and other poisinous metals are released to the athmosphere leading to microbiological growth of nitrogenfixating algae.
- In the combustion process phosphorous is leaked to the athmosphere and which can trigger eutrophication in water estuaries
Manure is: - Faeces and urine from animals
- A redlisted species of Heraclium sometimes found in forest remnants on Jutland.
- Urine from man.
Diatoms are: - Double atom compounds.
- One cell algae
- Double cell microalgae forming chains.
Fucus - A common plant in many households in the region with remarkable nitrogen fixating properties.
- The latin (scientific) name of the genus to which Bladderwrack belong.
- Microscopic invertebrates containing fungi which in turn indicate oxygen depletion.
Increasing eutrophication can change the relative growth of fish species so that: - Salmon and trout decrease while roach increase.
- Salmon and trout increase while roach decrease
- Herring, sprat and pike decrease while cod increase.
Chrysochromulina is: - An algae
- A small bottom living animal that can survive severe oxygen depletion.
- A freshwater mussle with very low nitrogen tolerance.
A limiting nutrient, what does that mean? - It means that if more of this nutrient is added eutrophication may increase.
- It means that if more of this nutrient is added eutrophication may decrease.
- It is a nutrient that when added decrease the effect of other nutrients.
Which nutrient is mostly the limiting one in the Baltic Proper? - Nitrogen
- Phosphorous
- There is no limiting nutrient
Which nutrient is mostly the limiting one in the Bothnian Bay? - Nitrogen
- Phosphorous
- There is no limiting nutrient.
Which nutrient is mostly the limiting one in Kattegatt? - Nitrogen
- Phosphorous
- There is no limiting nutrient.
What is sludge? - The bottom sediment of pelagic water systems
- The sediment layer of freshwater aquifiers.
- A restproduct from waste water treatment, rich in plant nutrient.
Quiz data by Magnus Lehman.
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