Organisms and their Environment
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Energy flow and food webs
SubtopicEnergy flow and food webs under Organisms and their Environment for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
If an organism is described as an 'autotroph', what can it do?
A.It eats other organisms
B.It makes its own food
C.It only lives in water
D.It decomposes wood
- 2.
What does a pyramid of energy show that a pyramid of numbers might not?
A.The actual flow of energy over time
B.The size of the organisms
C.The color of the organisms
D.The number of predators
- 3.
A food chain is: Phytoplankton Zooplankton Small fish Shark. What is the shark?
A.Producer
B.Primary consumer
C.Secondary consumer
D.Tertiary consumer
Download the worksheet for Organisms and their Environment - Energy flow and food webs to practice offline. It includes additional chapter-level practice questions.
Nutrient cycles (Carbon and Nitrogen)
SubtopicNutrient cycles (Carbon and Nitrogen) under Organisms and their Environment for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which form of nitrogen is found in DNA and proteins?
A.Nitrogen gas
B.Organic nitrogen
C.Nitrite ions
D.Nitrate ions
- 2.
In the carbon cycle, which of these is an example of 'combustion'?
A.A tree growing leaves
B.An animal running
C.Burning wood in a fireplace
D.Bacteria breaking down a leaf
- 3.
What role do fungi play when they grow on a fallen log?
A.Producers
B.Decomposers
C.Nitrogen fixers
D.Carnivores
Download the worksheet for Organisms and their Environment - Nutrient cycles (Carbon and Nitrogen) to practice offline. It includes additional chapter-level practice questions.
Population size
SubtopicPopulation size under Organisms and their Environment for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of the following describes a population in the stationary phase?
A.The number of deaths is zero
B.The number of births is zero
C.The number of deaths equals the number of births
D.The population is doubling every hour
- 2.
What does a sigmoid growth curve represent?
A.The growth of a population over time in an environment with limited resources
B.The infinite growth of a population
C.A population that is going extinct
D.The growth of a population with no lag phase
- 3.
Which of the following is a result of improved agriculture on human population growth?
A.Decreased food security
B.Increased death rate
C.Increased food availability leading to population growth
D.Higher rate of emigration
Download the worksheet for Organisms and their Environment - Population size to practice offline. It includes additional chapter-level practice questions.