14 questions
Eutrophication is...
too few nutrients in a body of water.
too many nutrients in a body of water.
high acid levels in a body of water.
high alkalinity levels in a body of water.
Eutrophication is caused by... (pick any which are true)
a lack of plastic recycling.
automobiles burning fossil fuels.
over fertilizing farm fields.
untreated seweage and effluent.
Chemicals that contribute to eutrophication include... (pick all that apply)
dissolved Oxygen.
phosphates.
nitrates.
sulfuric acid.
Nutrients cause what effect in our rivers?
bacteria eat the nitrates.
dissolved Oxygen levels rise.
algae grow faster than usual.
bacteria populations decrease.
When nutrient levels rise to high levels in a body of water, the effect on dissolved Oxygen levels is...
a decrease.
an increase.
does not change.
When algae levels increase in a body of water, it...
cuts off light to plants at the bottom.
increases light to the plants on the bottom.
causes dissolved Oxygen levels to increase.
causes bacteria populations to decrease.
A good dissolved Oxygen reading for health in a river would be ...
high parts per million.
low parts per million.
True or False? Eutrophication can affect human health.
True
False
Ecological effects of eutrophication can include... (chose all which apply)
decreased biodiversity
fertilizer reduction
new species invasion
toxicity
Why is waste disposal technology for human waste important in reducing eutrophication?
because aquatic life needs oxygen and sunlight
because a buffer zone can help act as a filter
because plastic damages the environment
because untreated sewage contains a lot of nutrients
If something is hypoxic, it does not have...
enough nutrients
enough oxygen
any algae
any water
Eutrophication occurs because of...
human activity only
natural causes only
both of the above
How does a buffer zone work?
It helps process sewage with chemicals and sunlight.
It reduces the ability of haemoglobin to carry oxygen.
It catches nutrients before they reach the water system.
It protects highly urbanized areas from fertilizer.
What is the name for water from agriculture which leaves the farmland and gets into the water system?
run-off
hypoxia
fertilizer
nitrates