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.
Study the diagram showing energy flow in two different food production systems. Which pathway provides the most energy for human consumption per unit area of land?
A.Pathway 1, because plants are at the start of the food chain.
B.Pathway 2, because livestock concentrate energy in their muscle tissue.
C.Pathway 1, because energy is lost at each trophic level in a food chain.
D.Pathway 2, because meat contains more protein than plants.
- 2.
Chemical fertilizers are primarily used in intensive farming to:
A.Kill weeds that compete with the main crop for light.
B.Prevent the growth of fungal pathogens in the soil.
C.Increase crop yields by providing essential mineral ions like nitrates.
D.Speed up the process of decomposition in the soil.
- 3.
What is a primary reason why large areas of tropical rainforest are cleared for food production?
A.To harvest rare wood for building greenhouses.
B.To provide space for cattle ranching or palm oil plantations.
C.To increase the global rate of transpiration.
D.To protect the soil from heavy rainfall.
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 human activity is most likely to cause the destruction of marine habitats such as coral reefs?
A.Sustainable selective logging
B.Coastal development and the discharge of untreated sewage
C.Introducing indigenous species back into the wild
D.Decreasing the use of plastic packaging
- 2.
Which of the following is a direct consequence of habitat destruction on biodiversity?
A.An increase in the number of niches available for specialist species
B.The extinction of species that can no longer find food or shelter
C.A decrease in the length of all food chains
D.An improvement in the genetic health of remaining populations
- 3.
How does deforestation contribute to an increase in the greenhouse effect?
A.It leads to a significant increase in atmospheric oxygen ()
B.It causes more nitrogen to be fixed into the soil
C.Fewer trees are available to absorb carbon dioxide () during photosynthesis
D.Burning trees releases large amounts of ozone into the stratosphere
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.
The process of eutrophication in a freshwater lake is most often triggered by the runoff of which substances?
A.Carbon dioxide and carbon monoxide
B.Nitrate and phosphate fertilizers
C.Lead and mercury from industrial waste
D.Persistent pesticides such as
- 2.
Which human activity is the most significant source of sulfur dioxide () pollution, which leads to the formation of acid rain?
A.Extensive deforestation for agriculture
B.The use of chemical insecticides on crops
C.The operation of nuclear power plants
D.The combustion of fossil fuels containing sulfur
- 3.
What is the primary danger posed to marine animals by the accumulation of non-biodegradable plastics in the ocean?
A.Plastics release large amounts of oxygen into the water
B.Animals may ingest plastics, leading to internal blockages or starvation
C.Plastics act as a fertilizer, causing excessive plant growth
D.Plastics are quickly decomposed by bacteria, removing oxygen from the water
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.
In the conservation flowchart below, which category of conservation does a 'Seed Bank' belong to?
A.In-situ conservation
B.Ex-situ conservation
C.Habitat restoration
D.Sustainable development
- 2.
Which strategy is most effective for maintaining sustainable fish stocks in the ocean?
A.Increasing the use of drift nets
B.Fishing only during the breeding season
C.Decreasing the mesh size of fishing nets
D.Implementing strict fishing quotas and closed seasons
- 3.
What is currently considered the primary cause of species extinction worldwide due to human influence?
A.Habitat destruction and fragmentation
B.Overhunting for food
C.Introduction of non-pathogenic bacteria
D.Natural climate cycles
Download the worksheet for Human Influences on Ecosystems - Conservation to practice offline. It includes additional chapter-level practice questions.