Human impacts on ecosystems MCQs

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 12, 2024

1. What is the term for the introduction of harmful substances or products into the environment?
a) Conservation
b) Pollution
c) Recycling
d) Eutrophication
Answer: b) Pollution

2. Which of the following is a major cause of habitat destruction?
a) Ecotourism
b) Reforestation
c) Urban development
d) Sustainable agriculture
Answer: c) Urban development

3. What is the primary cause of global warming and climate change?
a) Increased volcanic activity
b) Deforestation
c) Emission of greenhouse gases like carbon dioxide
d) Solar flares
Answer: c) Emission of greenhouse gases like carbon dioxide

4. How does deforestation primarily affect the carbon cycle?
a) It increases oxygen levels in the atmosphere
b) It reduces the amount of carbon dioxide absorbed by plants
c) It increases soil fertility
d) It decreases water levels in nearby rivers
Answer: b) It reduces the amount of carbon dioxide absorbed by plants

5. What is the term for the process where excess nutrients in water bodies lead to the growth of algae and depletion of oxygen?
a) Bioaccumulation
b) Eutrophication
c) Biomagnification
d) Evaporation
Answer: b) Eutrophication

6. Which of the following is an example of overexploitation?
a) Harvesting fish populations faster than they can reproduce
b) Planting trees in deforested areas
c) Using pesticides to control insect populations
d) Protecting endangered species
Answer: a) Harvesting fish populations faster than they can reproduce

7. What is an effect of invasive species on native ecosystems?
a) They enhance the biodiversity of the ecosystem
b) They often outcompete native species for resources
c) They always benefit native species by providing new food sources
d) They help to restore degraded habitats
Answer: b) They often outcompete native species for resources

8. How does plastic pollution in oceans primarily affect marine life?
a) It improves water quality
b) It serves as a habitat for fish
c) It entangles marine animals and is ingested, causing injury or death
d) It reduces ocean temperature
Answer: c) It entangles marine animals and is ingested, causing injury or death

9. Which of the following human activities is most directly associated with the depletion of the ozone layer?
a) Burning fossil fuels
b) Releasing chlorofluorocarbons (CFCs)
c) Deforestation
d) Overfishing
Answer: b) Releasing chlorofluorocarbons (CFCs)

10. What is biodiversity, and why is it important for ecosystems?
a) The variety of different species in a given area; it ensures ecosystem stability and resilience
b) The amount of plant life in a specific region; it provides food for all species
c) The population size of a single species; it determines ecosystem dominance
d) The level of pollution in an ecosystem; it affects air and water quality
Answer: a) The variety of different species in a given area; it ensures ecosystem stability and resilience

MCQs on wildlife