WorksheetsQuiz EVT520
Total questions: 15
Worksheet time: 6mins
The following heavy metals is toxic and poisonous at low concentration except:
Pb
Hg
Zn
Cd
The process when concentrations of a harmful substance increases in organisms at higher trophic levels in a food chain or food web.
Bioaccumulation
Biodegradable
Euthrophication
Biomagnification
Eutrophication causes a reduction in
Dissolved oxygen
Nutrients
Nitrogen and Phosphorus
All of these
Which of the following would be considered water pollution from a non-point source?
chemical from a factory entering a stream through a drain pipe
sewage leaking into a lake from a treatment plant
agricultural pesticides leaded into ground water from a storage area
residential runoff contributing to poor water quality
These are the physical parameters of water quality except
BOD
Turbidity
Temperature
Taste
In which of the following zones would you expect fish to be absent?
Septic zone
Clean zone
Decomposition zone
Recovery zone
The biological oxygen demand (BOD) test is designed to directly measure
how rapidly the water is moving
amount of oxygen required to decompose organic matter in water
the amounts of nitrites in the water
amount of oxygen required to chemically oxidize the organic material and inorganic nutrients present in water
What is the effect of an increase in BOD?
alga bloom occurs
aquatic organisms die
bacteria decomposes
None of above
We can prevent water pollution by:
Reduce the use of plastic.
Properly dispose of chemicals.
Do not apply fertilizer or pesticides near a body of water.
All of above.
Chemical oxygen demand (COD) is the water quality parameter to measure how clear of the water body.
True
False
Below is the effects of increasing nutrients in a lake except
increase in oxygen
eutrophication
oxygen depletion
aquatic organism die
Which of the following is the chemical parameter of water quality?
Turbidity
Color
Hardness
Temperature
Eutrophic water has lots of nutrients such as
oxygen and glucose
phosphates and nitrates
sulfates carbohydrates
None of these
Why are non-biodegradable plastics a problem in the environment?
They leak toxic chemicals
They contain poisons for wildlife
They are filling up lakes and ponds
They do not decompose or break down naturally
Which of the following materials is biodegradable?
Metals
Toxic chemical
Woods
Glass
