Human Influences on Ecosystems
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Food supply and habitat destruction
SubtopicFood supply and habitat destruction under Human Influences on Ecosystems for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of these is a way to reduce the negative impact of human activities on ecosystems?
A.Increasing the use of single-use plastics
B.Expanding monoculture farming
C.Establishing protected areas and nature reserves
D.Increasing the burning of fossil fuels
- 2.
Why does deforestation often lead to an increase in flooding downstream?
A.Trees normally pump water into the ground.
B.Without trees, less water is absorbed by the soil and more runs off into rivers.
C.Dead trees block the rivers and cause them to overflow.
D.Deforestation causes more rain to fall.
- 3.
What is the main environmental risk of using genetically modified (GM) crops that are resistant to herbicides?
A.The crops will die if herbicide is sprayed on them.
B.The resistance gene might spread to wild weeds, making them harder to kill.
C.The crops will produce less food than non-GM crops.
D.The crops will require more water to grow.
Download the worksheet for Human Influences on Ecosystems - Food supply and habitat destruction to practice offline. It includes additional chapter-level practice questions.
Pollution (Greenhouse effect)
SubtopicPollution (Greenhouse effect) under Human Influences on Ecosystems for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
What happens to the global climate when the concentration of greenhouse gases in the atmosphere decreases significantly?
A.The global temperature would likely decrease
B.The global temperature would likely increase
C.The oceans would boil
D.The Sun would get brighter
- 2.
Which of the following describes the effect of greenhouse gases on the 'heat budget' of the Earth?
A.They increase the amount of heat escaping to space
B.They decrease the amount of solar radiation reaching the surface
C.They reduce the amount of heat energy that leaves the Earth's system
D.They have no effect on the heat budget
- 3.
Which gas is produced as a byproduct of the combustion of gasoline in car engines?
A.Helium
B.Carbon dioxide
C.Ammonia
D.Phosphine
Download the worksheet for Human Influences on Ecosystems - Pollution (Greenhouse effect) to practice offline. It includes additional chapter-level practice questions.
Conservation
SubtopicConservation under Human Influences on Ecosystems for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of these is a way that governments can encourage conservation?
A.Giving subsidies for cutting down old-growth forests
B.Passing laws that make it illegal to hunt endangered species
C.Removing all taxes on single-use plastics
D.Closing all national parks to the public
- 2.
What does the term 'urbanization' refer to, which often negatively impacts local wildlife?
A.The process of planting new forests
B.The growth of cities and the conversion of rural land into urban areas
C.The protection of marine life in the ocean
D.The process of recycling paper
- 3.
Which of these describes a 'threatened' species?
A.A species that is already extinct
B.A species whose population is so large it causes problems
C.A species that is at risk of becoming endangered in the near future
D.A species that only lives in a zoo
Download the worksheet for Human Influences on Ecosystems - Conservation to practice offline. It includes additional chapter-level practice questions.