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Biology for IGCSE & O level - Human Influences On Ecosystems (Section 5)

1
What is one of the aims of sustainable fishing?
Answer
(B)
To maintain healthy fish populations.
2
What is the primary goal of 'ex-situ conservation'?
Answer
(B)
To remove species from their natural habitat and relocate them.
3
Which breeding method involves fertilizing the eggs outside of the female body?
Answer
(C)
In vitro fertilization
4
What is one example of a sustainable timber production practice?
Answer
(C)
Replanting trees after they are cut.
5
What is the role of 'eco-tourism' in conservation efforts?
Answer
(B)
To provide funds and raise awareness for conservation.
6
What is the role of 'seed banks' in conservation?
Answer
(C)
To preserve genetic diversity.
7
Which of the following is a consequence of the enhanced greenhouse effect?
Answer
(B)
Rising sea levels
8
Which of the following are the key factors that impact ecosystem diversity?
Answer
A
B
C
D
9
What are some of the methods used in conservation?
Answer
B
C
D
10
Which of the following is a characteristic of non-renewable resources?
Answer
(D)
They take millions of years to form.
11
What is the role of decomposers in an ecosystem experiencing eutrophication?
Answer
(C)
They break down dead organic matter, leading to oxygen depletion.
12
What is the primary cause of the enhanced greenhouse effect?
Answer
(B)
An increase in the concentration of greenhouse gases
13
What is the main source of pollution in many coastal areas?
Answer
(C)
Waste and chemicals from human activities
14
What is the definition of a 'sustainable resource'?
Answer
(B)
A resource that is replaced as fast as it is used.
15
Which activity is likely to increase the concentration of methane in the atmosphere?
Answer
(D)
Raising livestock
16
What is the meaning of the term 'endangered species'?
Answer
(C)
A species that is at risk of extinction.
17
What is a significant consequence of overfishing?
Answer
(B)
Collapse of fish populations
18
What is the meaning of the term 'extinct'?
Answer
(C)
A species that no longer exists anywhere.
19
Which of the following are examples of ex-situ conservation techniques?
Answer
A
B
C
20
What conservation technique involves monitoring and tracking animal populations?
Answer
(B)
Species monitoring.
21
What is a key feature of the greenhouse effect?
Answer
(B)
It warms the Earth by trapping heat in the atmosphere.
22
What action is often associated with deforestation?
Answer
(C)
Habitat destruction.
23
Which of the following is a key feature of the greenhouse effect?
Answer
(C)
It traps heat in the atmosphere, warming the planet.
24
What are some of the effects of land pollution?
Answer
A
B
C
25
What can be a result of the introduction of non-native species into an area?
Answer
(C)
Disruption of the ecosystem.
26
What are the potential consequences of deforestation?
Answer
A
B
C
27
What are the key components of sustainable fishing practices?
Answer
A
C
D
28
Which human activity is the biggest contributor to air pollution?
Answer
(A)
Industrial activities
29
What is the purpose of species monitoring programs?
Answer
(B)
To track population sizes.
30
What is the role of the greenhouse effect in maintaining Earth's temperature?
Answer
(B)
It traps heat radiated from the Earth's surface, warming the planet
31
What is the primary function of the wetlands?
Answer
(D)
All of the above
32
What is the meaning of 'in-situ conservation'?
Answer
(A)
Conserving species in their natural habitat.
33
What is the primary driver of habitat destruction?
Answer
(C)
Increasing human population
34
What is the meaning of 'biodiversity loss'?
Answer
(B)
A decrease in the variety of life on Earth.
35
What is the primary source of pollution in many urban areas?
Answer
(D)
Transportation (cars, trucks etc)
36
What is a benefit of crop rotation?
Answer
(B)
Reduced soil erosion.
37
What is the impact of algal blooms?
Answer
(B)
They decrease the levels of oxygen in water bodies.
38
What is the main function of the ozone layer?
Answer
(A)
To absorb harmful UV radiation from the sun.
39
What is a primary cause of deforestation?
Answer
(C)
Urbanization and agriculture
40
Which of the following is a characteristic of a non-biodegradable pollutant?
Answer
(B)
It remains in the environment for a long time.
41
Which of the following is a negative effect of intensive farming?
Answer
(C)
Contribution to greenhouse gas emissions
42
Which of the following human activities causes the release of methane in the atmosphere?
Answer
(C)
Rice cultivation
43
What are the potential consequences of rising sea levels?
Answer
A
B
D
44
What is a 'keystone species'?
Answer
(D)
A species that has a disproportionately large impact on its ecosystem.
45
Which of the following is an example of a non-point source of water pollution?
Answer
(C)
Agricultural runoff from a large area.
46
What is the primary environmental problem caused by the burning of fossil fuels?
Answer
(C)
Air pollution and climate change
47
What is the role of greenhouse gases in the Earth's atmosphere?
Answer
(B)
To absorb and re-emit infrared radiation, warming the Earth.
48
What is the primary threat to coral reefs worldwide?
Answer
(B)
Ocean acidification and warming
49
What is a characteristic of a sustainable farming practice?
Answer
(C)
Use of crop rotation and cover cropping.
50
What is the main environmental issue caused by plastic waste?
Answer
(C)
They are non-biodegradable and persistent in the environment.