
IB ESS Topic 8
Authored by Lisa Thompson
Science
11th Grade
NGSS covered

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following pollutants contributes to eutrophication?
pesticides
chemical fertilizers
heavy metals
oil
Answer explanation
Only chemical fertilizer contain nitrogen and phosphorous that drive eutrophication.
Tags
NGSS.MS-LS2-5
NGSS.MS-ESS3-4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An example of an organic pollutant is
Radioactive waste from a nuclear power plant
Chemical fertilizer applied to fields
Animal manure from a feedlot
An oil spill in the ocean
Answer explanation
The only example of organic pollution is animal manure. The others are inorganic.
Tags
NGSS.MS-LS2-4
NGSS.MS-ESS3-4
NGSS.MS-ESS3-3
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Nitrogen in groundwater is more likely when
located near/under forested areas
located near/under agricultural fields
located near/under industrial areas
soils are exposed to acid deposition
Answer explanation
Nitrogen is not typically a natural component of groundwater and usually indicates fertilizer contamination from agriculture and/or failed septic systems. The other options are not sources for nitrogen in groundwater.
Tags
NGSS.MS-LS2-4
NGSS.MS-ESS3-4
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Nutrient rich runoff from fertilized fields causes
adaptation
eutrophication
biomagnification
denitrification
Answer explanation
The addition of nutrients into water bodies from fertilized fields will most likely lead to eutrophication and not biomagnification as nutrients are biodegradable. Eutrophication is the increase of nitrates in water, while denitrification reduces nitrates concentrations.
Tags
NGSS.MS-LS2-4
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Eutrophication is:
the decrease in oxygen content of water due to an explosion of decomposers
an important energy flow in the nitrogen cycle
a process used to purify water
the gradual improvement of water quality in lakes and rivers
Answer explanation
Eutrophication starts with the increased input of nutrients which results in an increase in surface algae that block out sunlight to deeper parts of the water body. The increase in algae results in a temporary increase of smaller consumers but as they can't keep up with algal growth, much of the algae remains uneaten and when it dies falls to the bottom where decomposers increase using up oxygen. Larger consumers begin to die resulting in more decomposers until the complete food web collapses.
Tags
NGSS.MS-LS2-4
NGSS.MS-LS2-3
NGSS.MS-LS2-1
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following does NOT occur at the end stage of eutrophication?
Average dissolved oxygen content of water decreases
Water nutrient content increases
Producers increase
Diversity increases
Answer explanation
As eutrophication progresses and dissolved water content decreases, the food web collapses, reducing diversity.
Tags
NGSS.MS-LS2-4
NGSS.MS-LS2-5
NGSS.MS-LS2-3
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Biochemical oxygen demand is measured in
percent (%)
parts per billion (ppb)
milligrams per liter (mg/L)
grams per liter (g/L)
Answer explanation
The correct units of measurement are milligrams per Liter or parts per million (ppm).
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