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Ecology 2 - Human Impact

Total questions: 20

Worksheet time: 16mins

Name
Class
Date
1.

The phenomenon by which toxins concentrate in the organisms at higher trophic levels within an ecosystem is known as...

a)

Biotoxicity

b)

Biomagnification

c)

Eutrophication

d)

Predation

2.

Consider the following food chain:

Algae > Mayfly > Minnow > Trout

In a polluted ecosystem, which organism would likely have the HIGHEST level of toxic chemicals in its body?

a)

Algae

b)

Mayfly

c)

Minnow

d)

Trout

3.
When taken to a new habitat, non-native plants often threaten native plants of the new habitat.  Why do they do this?
a)
Non-native plants are able to mutate rapidly
b)
Non-native  plants cause native animals to relocate
c)
Non-native plants are able to be used for medicine
d)
Non-native plants compete with native plants for resources
4.
Kudzu has overgrown many parts of southern Missouri and native ground plants have disappeared from the area. This is an example of:
a)
Parasitism between kudzu and the native plants
b)
A predator prey relationship between ground plants and kudzu
c)
Competition occurring between the native and invasive species
d)
Commesalism occurring between the kudzo and native plants
5.

Which is a MAJOR cause of acid rain?

a)

spraying pesticides on crops

b)

burning fossil fuels for energy

c)

dumping sewage in rivers

d)

using Nuclear power stations

6.

Acid rain can damage

a)

Drinking water sources

b)

Aquatic (water) life

c)

Architecture / buildings

d)

All options are correct

7.
What is deforestation?
a)
Clearing Earth's forests on a massive scale
b)
Eating too much vegetables
c)
Going to a forest and pulling weeds
d)
Clearing the five trees in my backyard
8.

Deforestation causes an increase in atmospheric carbon dioxide

a)

true

b)

false

9.
What are the effects of deforestation ?
a)
loss of habitat
b)
increased green house gasses 
c)
soil erosion and flooding
d)
all of the above
10.
Does deforestation contribute to global warming?
a)
No, trees aren't that important
b)
Sometimes because only the cutting down of Maple trees contributes to global warming
c)
No, deforestation adds methane to the atmosphere, which makes the Earth cooler
d)
Yes; less trees means less CO2 is turned into oxygen.
11.
Why does cutting down trees increase global warming?
a)
trees soak up carbon dioxide
b)
trees provide shade which counteracts global warming
c)
trees absorbs the sun's energy without radiating back into the atmosphere
d)
trees drain greenhouse gases like methane from soil
12.

All of the following are causes for biodiversity loss, EXCEPT:

a)

Habitat Loss

b)

Invasive Species

c)

Replanting trees

d)

Pollution

13.
 Which biome is more likely to survive a change in the environment?
a)
High (rich) biodiversity
b)
Low (poor) biodiversity
14.

Image "B" shows more biodiversity than image "A". Why?

a)

Because "B" shows more different species than image "A"

b)

Because image "B" has less different species than "A"

c)

"A" has a greater number of same species plants so this statement is wrong.

d)

Both images show the same biodiversity

15.

High biodiversity makes it more likely that the ecosystem will be able to keep functioning after a disturbance, such as disease or natural disaster.

a)

True

b)

False

16.

High biodiversity is a sign of a healthy ecosystem.

a)

True

b)

False

17.
An increase of biodiversity is normally a result of introducing an invasive species into an ecosystem.
a)
True
b)
False
18.
Why do the populations of invasive species grow so quickly? 
a)
invasive species require more energy than other organisms
b)
invasive species are prey to many animals.
c)
invasive species have no natural predators.
d)
invasive species keep the ecosystems in equilibrium.
19.

What are "holes" in the ozone layer?

a)

places where the ozone concentrations are lower than under normal conditions, allowing more UV radiation to reach the Earth's surface.

b)

places where the ozone concentrations are higher than under normal conditions, allowing more UV radiation to reach the Earth's surface.

c)

places where the ozone concentrations are higher than under normal conditions, allowing lessUV radiation to reach the Earth's surface.

20.

The ozone layer protects us from

a)

Increased atmospheric heat

b)

CFCs

c)

UV rays

d)

Decreased atmospheric heat

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