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Biology for IGCSE & O level - Human Influences On Ecosystems (Section 1)

1
What are the primary gases contributing to the greenhouse effect?
Answer
B
C
2
What is the impact of overfishing on marine ecosystems?
Answer
(B)
Damage to food webs.
3
Which of these is a method used in 'ex-situ conservation'?
Answer
(C)
Captive breeding programs.
4
What are the adverse effects of the use of pesticides?
Answer
A
B
C
5
What is the primary consequence of the enhanced greenhouse effect?
Answer
(B)
Global warming.
6
In captive breeding, what is the technique used to store sperm, eggs, or embryos?
Answer
(C)
Cryopreservation
7
What are some negative effects of intensive livestock farming?
Answer
A
B
C
8
Which assisted reproductive technology is used in captive breeding?
Answer
(B)
Artificial insemination.
9
What is the ultimate consequence of a species becoming extinct?
Answer
(B)
No more members of that species exist.
10
What is the main environmental concern related to unsustainable timber production?
Answer
(B)
Deforestation.
11
Which of the following describes a cause of soil degradation?
Answer
(B)
Overgrazing
12
Which of the following is an example of how climate change can impact ecosystems?
Answer
(B)
Shifts in plant and animal ranges
13
What human activities threaten a species survival?
Answer
A
B
C
D
14
What is a key principle of sustainable resource management?
Answer
(B)
To ensure resources are available for future use.
15
What is a major concern associated with introducing non-native species?
Answer
(C)
Disruption of native ecosystems.
16
What is the role of fertilizers in agriculture?
Answer
(B)
To increase crop yields.
17
What are the factors that lead to a reduction in species population?
Answer
A
B
D
18
Which of the following is a significant source of water pollution?
Answer
(C)
Agricultural runoff
19
Which activity is most likely to increase the risk of soil erosion?
Answer
(C)
Deforestation
20
What is a significant impact of the use of pesticides in agriculture?
Answer
(A)
Reduced biodiversity
21
Which of the following are effects of habitat destruction?
Answer
A
B
C
22
What is the primary goal of 'reforestation'?
Answer
(C)
To replant trees in deforested areas.
23
Which of the following is a potential consequence of rising sea levels?
Answer
(C)
Displacement of human populations
24
What is the role of ozone in the atmosphere?
Answer
(B)
To absorb harmful ultraviolet radiation
25
What are the benefits of species monitoring?
Answer
A
B
26
What are the negative impacts of intensive livestock farming on the environment?
Answer
A
B
C
27
Which of the following is NOT a source of the greenhouse gas carbon dioxide?
Answer
(D)
Photosynthesis
28
Which of the following is a potential consequence of deforestation?
Answer
(C)
Loss of biodiversity
29
What are the practices to maintain sustainable fishing?
Answer
A
B
D
30
What are some of the environmental impacts of sewage?
Answer
A
B
C
31
What is the primary reason for the creation of national parks?
Answer
(C)
To conserve biodiversity.
32
What are some of the negative environmental impacts of waste disposal?
Answer
A
B
C
33
What is the primary environmental concern associated with the use of fertilizers?
Answer
(B)
Water pollution
34
What is the primary concern about invasive species?
Answer
(C)
They can disrupt ecosystems and native species.
35
Which of the following best describes the role of the ozone layer?
Answer
(B)
Absorbing harmful ultraviolet (UV) radiation from the sun.
36
What is the most significant factor contributing to species endangerment?
Answer
(B)
Habitat loss.
37
Which are examples of human activities which lead to habitat destruction?
Answer
A
B
D
38
What are the major reasons behind reducing the population of species?
Answer
A
B
39
Which of the following are examples of greenhouse gases?
Answer
A
C
40
What is the main purpose of 'cryopreservation' in captive breeding?
Answer
(A)
To freeze and store sperm, eggs or embryos.
41
How does deforestation impact the carbon cycle?
Answer
(B)
It releases carbon dioxide into the atmosphere.
42
Which of the following best exemplifies in-situ conservation?
Answer
(B)
A national park.
43
What is the main effect of the greenhouse effect?
Answer
(B)
Increased Earth temperature.
44
Which human activity is LEAST likely to directly contribute to the loss of biodiversity?
Answer
(C)
Establishing wildlife reserves.
45
What are the conservation methods that help prevent species extinction?
Answer
A
B
D
46
Which of the following best describes the relationship between deforestation and climate change?
Answer
(C)
Deforestation increases atmospheric carbon dioxide, contributing to climate change.
47
What is a potential impact of climate change on ecosystems?
Answer
(B)
Changes in species distribution
48
What are the aims of setting up marine reserves?
Answer
A
B
D
49
What is the purpose of a 'supplement' within the text?
Answer
(B)
To give additional information.
50
Which gas is most responsible for global warming?
Answer
(B)
Carbon Dioxide