Human Influences on Ecosystems
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Food supply
SubtopicFood supply under Human Influences on Ecosystems for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
What is the main role of decomposers in an ecosystem used for food production?
A.They capture energy from the sun
B.They break down dead matter and release nutrients back into the soil
C.They provide a source of food for the crops
D.They prevent weeds from growing
- 2.
How does increasing the human population affect the environment through food supply?
A.It decreases the need for land
B.It increases the pressure to convert natural habitats into farmland
C.It leads to a reduction in the use of fertilizers
D.It helps to restore the ozone layer
- 3.
Which of these practices would most likely help to reduce soil erosion on a hilly farm?
A.Ploughing straight up and down the hill
B.Terracing the slopes
C.Removing all trees and shrubs
D.Keeping the soil bare during the rainy season
Download the worksheet for Human Influences on Ecosystems - Food supply to practice offline. It includes additional chapter-level practice questions.
Habitat destruction
SubtopicHabitat destruction under Human Influences on Ecosystems for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of the following is true about the rate of habitat destruction currently?
A.It is slower than it was 1000 years ago
B.It is occurring at a rapid pace due to human population growth
C.It has completely stopped in the last decade
D.It only happens in cold climates
- 2.
Why does habitat destruction often lead to a loss of genetic diversity within a species?
A.The population size decreases, leaving a smaller gene pool
B.Animals mate with different species
C.Mutation rates decrease
D.The DNA of the animals changes instantly
- 3.
Which of these is a way that humans can help reduce habitat destruction?
A.Increasing the use of single-use plastics
B.Creating protected national parks
C.Expanding urban sprawl
D.Encouraging more monoculture
Download the worksheet for Human Influences on Ecosystems - Habitat destruction to practice offline. It includes additional chapter-level practice questions.
Pollution
SubtopicPollution under Human Influences on Ecosystems for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of these is a strategy to reduce the impact of human activity on the ecosystem?
A.Increasing the use of pesticides
B.Reforestation and protecting natural habitats
C.Dumping more waste in landfills
D.Building more coal-fired power plants
- 2.
What is the primary cause of 'smog' in large cities?
A.High levels of oxygen
B.A mixture of smoke and fog combined with pollutants like nitrogen oxides
C.Too much water vapor from the ocean
D.The release of helium from balloons
- 3.
Which problem is directly linked to the use of non-biodegradable pesticides like DDT?
A.Increased soil fertility
B.Thinning of eggshells in birds of prey due to biomagnification
C.Faster growth of aquatic plants
D.Reduction in atmospheric carbon dioxide
Download the worksheet for Human Influences on Ecosystems - Pollution to practice offline. It includes additional chapter-level practice questions.
Conservation
SubtopicConservation under Human Influences on Ecosystems for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of the following is a potential risk of mono-culture (growing only one type of crop)?
A.It increases the biodiversity of the area
B.It makes the crop more vulnerable to being wiped out by a single disease
C.It improves the quality of the soil over time
D.It encourages the growth of many different wild plants
- 2.
What is the primary benefit of maintaining large areas of mangrove forests?
A.They provide a source of firewood for everyone in the world
B.They protect coastlines from erosion and serve as fish nurseries
C.They are the best places to build large industrial ports
D.They prevent any rain from falling on coastal cities
- 3.
Why should we limit the use of non-biodegradable plastics?
A.They break down into soil nutrients very quickly
B.They persist in the environment and can harm wildlife for many years
C.They are the only source of food for many marine animals
D.They increase the rate of evaporation in the ocean
Download the worksheet for Human Influences on Ecosystems - Conservation to practice offline. It includes additional chapter-level practice questions.