MCQs on Environment and Ecology

[Set - 4]

1. What term is used to describe the gradual loss of biodiversity in an ecosystem?

A) Degradation
B) Extinction
C) Fragmentation
D) Desertification

Correct Answer: A) Degradation
Explanation: Biodiversity degradation refers to the gradual loss of species and habitats, reducing the variety of life in an ecosystem.

2. Which concept refers to the preservation and protection of natural habitats to maintain biodiversity?

A) Conservation
B) Urbanization
C) Pollution control
D) Economic development

Correct Answer: A) Conservation
Explanation: Conservation involves preserving and protecting natural habitats to maintain biodiversity and ensure the survival of various species.

3. Which biome is characterized by high temperatures and low precipitation?

A) Temperate forest
B) Desert
C) Savannah
D) Boreal forest

Correct Answer: B) Desert
Explanation: Deserts are characterized by high temperatures and very low precipitation, resulting in arid conditions and specialized vegetation.

4. Which of the following is a direct consequence of global deforestation?

A) Increased soil fertility
B) Enhanced biodiversity
C) Loss of habitat for wildlife
D) Improved air quality

Correct Answer: C) Loss of habitat for wildlife
Explanation: Global deforestation leads to the loss of habitats for numerous wildlife species, contributing to decreased biodiversity.

5. Which environmental problem is associated with the accumulation of plastic waste in the oceans?

A) Marine litter
B) Coastal erosion
C) Soil salinization
D) Desertification

Correct Answer: A) Marine litter
Explanation: Marine litter refers to the accumulation of plastic waste and other debris in the oceans, which can harm marine life and ecosystems.

6. What is the term for the gradual loss of fertile land due to factors like drought and overgrazing?

A) Soil erosion
B) Desertification
C) Deforestation
D) Salinization

Correct Answer: B) Desertification
Explanation: Desertification is the process by which fertile land becomes desert due to factors such as prolonged drought, deforestation, and overgrazing.

7. Which of the following species is an example of an umbrella species?

A) Polar bear
B) Golden eagle
C) Monarch butterfly
D) Green sea turtle

Correct Answer: A) Polar bear
Explanation: The polar bear is an umbrella species because its protection also helps conserve the broader Arctic ecosystem and other species within it.

8. Which type of ecological interaction benefits one species while harming another?

A) Mutualism
B) Commensalism
C) Parasitism
D) Symbiosis

Correct Answer: C) Parasitism
Explanation: In parasitism, one species benefits at the expense of another, often causing harm to the host species.

9. What term is used for a species that is likely to become endangered if current trends continue?

A) Invasive
B) Extinct
C) Endemic
D) Vulnerable

Correct Answer: D) Vulnerable
Explanation: A vulnerable species is one that is at risk of becoming endangered in the near future if current conditions persist.

10. Which of the following is an example of a secondary pollutant?

A) Carbon monoxide
B) Nitrogen dioxide
C) Sulfur dioxide
D) Ozone

Correct Answer: D) Ozone
Explanation: Ozone is a secondary pollutant formed by chemical reactions between nitrogen oxides and volatile organic compounds in the presence of sunlight.

11. What type of forest is found in regions with mild, wet winters and hot, dry summers?

A) Tropical rainforest
B) Temperate rainforest
C) Mediterranean forest
D) Boreal forest

Correct Answer: C) Mediterranean forest
Explanation: Mediterranean forests are characterized by mild, wet winters and hot, dry summers, with vegetation adapted to these seasonal conditions.

12. Which of the following is a major contributor to soil degradation?

A) Conservation tillage
B) Cover cropping
C) Overgrazing
D) Organic farming

Correct Answer: C) Overgrazing
Explanation: Overgrazing by livestock can lead to soil degradation by reducing vegetation cover and increasing erosion.

13. What term describes a species that is not native to an area and causes ecological harm?

A) Endemic species
B) Invasive species
C) Keystone species
D) Migratory species

Correct Answer: B) Invasive species
Explanation: Invasive species are non-native species that can outcompete native species and disrupt ecosystem balance, causing ecological harm.

14. Which environmental issue is associated with the depletion of the ozone layer?

A) Global warming
B) Ocean acidification
C) Increased UV radiation
D) Desertification

Correct Answer: C) Increased UV radiation
Explanation: Depletion of the ozone layer allows more UV radiation to reach the Earth’s surface, leading to potential health and environmental issues.

15. Which of the following practices is important for sustainable agriculture?

A) Crop rotation
B) Chemical pesticide use
C) Monocropping
D) Overirrigation

Correct Answer: A) Crop rotation
Explanation: Crop rotation is important for sustainable agriculture as it helps maintain soil fertility, reduce pest and disease problems, and improve crop yields.

16. Which of the following is an example of an ecosystem service provided by forests?

A) Water purification
B) Plastic production
C) Fossil fuel extraction
D) Urban development

Correct Answer: A) Water purification
Explanation: Forests provide ecosystem services such as water purification by filtering and regulating water flow through their vegetation and soil.

17. Which environmental policy focuses on reducing carbon emissions from energy production?

A) Clean Power Plan
B) Endangered Species Act
C) Marine Protection Act
D) Wilderness Act

Correct Answer: A) Clean Power Plan
Explanation: The Clean Power Plan aims to reduce carbon emissions from power plants and promote cleaner energy sources to combat climate change.

18. Which of the following is an example of a non-renewable resource?

A) Solar energy
B) Wind power
C) Natural gas
D) Geothermal energy

Correct Answer: C) Natural gas
Explanation: Natural gas is a non-renewable resource that cannot be replenished quickly and contributes to greenhouse gas emissions when burned.

19. Which type of forest is characterized by coniferous trees and long, cold winters?

A) Tropical rainforest
B) Boreal forest
C) Temperate deciduous forest
D) Mediterranean forest

Correct Answer: B) Boreal forest
Explanation: Boreal forests, also known as taiga, are characterized by coniferous trees and long, cold winters, found in high northern latitudes.

20. Which of the following is an example of an ecosystem service provided by wetlands?

A) Carbon sequestration
B) Air purification
C) Noise reduction
D) Urban cooling

Correct Answer: A) Carbon sequestration
Explanation: Wetlands act as carbon sinks, sequestering carbon dioxide from the atmosphere and helping to mitigate climate change.

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