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Environment & Ecology MCQs - 2026-04-02

21.
What is a direct consequence of permafrost thaw on Arctic infrastructure?
A Strengthening of buildings and roads.
B Increased stability of pipelines.
C Destabilization of infrastructure built on frozen ground.
D Improved navigation through frozen waterways.
22.
The release of greenhouse gases from thawing permafrost can create a dangerous:
A Negative feedback loop that cools the planet.
B Positive feedback loop that accelerates global warming.
C Neutral feedback loop with no impact on temperature.
D Ozone depletion cycle.
23.
Besides greenhouse gases, what other significant concern is associated with accelerated permafrost thaw?
A Increased seismic activity.
B Release of ancient microbes and potential pathogens.
C Formation of new freshwater lakes.
D Depletion of the ozone layer.
24.
Which greenhouse gases are primarily released due to permafrost thaw?
A Nitrous oxide and ozone.
B Carbon dioxide and methane.
C Sulfur dioxide and nitrogen dioxide.
D Chlorofluorocarbons (CFCs).
25.
What is permafrost?
A Soil that is permanently saturated with water.
B Ground that remains frozen for two or more consecutive years.
C A type of volcanic rock found in cold regions.
D Glacial ice that has melted and refrozen.
26.
The Amazon rainforest is home to approximately what percentage of the world's known species?
A 1%
B 5%
C 10%
D 25%
27.
Besides environmental impacts, the Amazon drought severely affects:
A Global financial markets.
B Indigenous and riverine communities.
C International space exploration.
D The development of artificial intelligence.
28.
What is a significant consequence of the Amazon drought on the rainforest's role in the global carbon cycle?
A It enhances the Amazon's capacity as a carbon sink.
B It transforms the Amazon from a carbon sink into a carbon source.
C It has no significant impact on the carbon cycle.
D It leads to increased carbon sequestration in the soil.
29.
Which of the following factors is contributing to the severe drought in the Amazon basin in 2026?
A Increased volcanic activity.
B Rising global temperatures and potential El Niño phenomena.
C Deforestation for agricultural expansion only.
D A sudden decrease in oceanic evaporation.
30.
The Amazon rainforest is crucial for global climate regulation primarily because it:
A Absorbs a significant amount of atmospheric carbon dioxide.
B Produces a large percentage of the world's oxygen.
C Influences oceanic currents.
D Regulates global wind patterns.