WorksheetsLimno 2020 Midterm 2 Practice
Total questions: 15
Worksheet time: 15mins
How are carbon and photosynthesis related?
As photosynthetic rate increases, carbon dioxide decreases
carbon dioxide is a product of photosynthesis
They aren't, carbon is not involved in photosynthesis
As photosynthetic rate increases, carbon dioxide increases
How can algae influence the pH of a water body? Select all that apply
They cannot
They remove carbon dioxide during photosynthesis
They introduce carbon dioxide during respiration
They remove H+ ions during respiration
True/False: The landscape/geology around a water body can impact its pH?
True
False
True/False: Trophic Cascades resutlt in indirect effects from one level to another, more than one level down.
True
False
True/False: Competition can only be observed between individuals of different species.
True
False
What is the 'iron trap'
An expression to represent how eutrophication rate has increased since the industrial revolution
A term used to describe how ferrous iron can bind to dissolved phosphorus in the presence of oxygen, removing it from the system
A term used to describe how iron mining can introduce pollutants into a system, trapping it in a calamitous state
An expression used to describe how the introduction of iron into a system can cause harmful blooms of algae
Which of the following is NOT true of nitrogen fixation in cyanobacteria?
It usually the preferred source of nitrogen for cyanobacteria
The process can not take place in the presence of oxygen
Some cyanobacteria run this process at night to avoid exposing its enzymes to oxygen from photosynthesis
It is the least preferred source of nitrogen for cyanobacteria
How to autotrophic organisms obtain energy?
They make their own
They 'steal' it from other organisms
They consume other organisms to obtain energy
They do not require energy sources to function
What is the euphotic zone?
Part of a lake where photosynthesis can occur
Part of a lake where temperature is highest
Part of a lake where nutrients are concentrated
Part of a lake where plankton live
Here are mid-summer temperature profile for two lakes. Which do you expect to have more P during the fall turnover?
Martin (blue)
Harris (pink)
Unable to determine based off of graph
Both should have the same amount
What diel vertical migration?
Vertical movement of phytoplankton throughout the day
Vertical profile of oxygen throughout the day
Vertical profile of pH throughout the day
Vertical movement of fish throughout the day
What does the Redfield ratio compare?
Nitrogen:Phosphorus:Potassium
Carbon:Nitrogen:Phosphorus
Carbon:Nitrogen:Potassium
Silica:Nitrogen:Phosphorus
What are TWO ways in which algae can deter herbivores?
Structures to increase surface area
Mucous-like membrane
Attaching to surfaces
Moving faster than the herbivores
What is likely the easiest way to encourage primary production in a pond?
Remove all of the herbivores
Fertilize the pond
Introduce something to eat the herbivores
They are all equally effective and easy to carry-out
Which of the following would you consider to be a generalist feeder?
Daphnia
Copepod
Rotifer
