Ecology
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Ecosystems and Biomes
SubtopicEcosystems and Biomes under Ecology for Grade 9 IB.
Preview questions (no answers)
- 1.
What happens to the amount of energy as you move from the bottom to the top of an energy pyramid?
A.It increases
B.It decreases
C.It stays the same
D.It fluctuates randomly
- 2.
Which organism would occupy the first trophic level in a marine ecosystem?
A.Zooplankton
B.Phytoplankton
C.Small fish
D.Whale
- 3.
What is an ecosystem?
A.Only the living things in an area
B.Only the non-living things in an area
C.The interaction of living and non-living components in an area
D.The study of the environment
Download the worksheet for Ecology - Ecosystems and Biomes to practice offline. It includes additional chapter-level practice questions.
Food Webs and Trophic Levels
SubtopicFood Webs and Trophic Levels under Ecology for Grade 9 IB.
Preview questions (no answers)
- 1.
Which organism would be at the base of a biomass pyramid for a pond?
A.Large fish
B.Frogs
C.Insects
D.Algae
- 2.
What is the main source of energy that allows producers to create organic molecules?
A.Water
B.Soil nutrients
C.Sunlight
D.Oxygen
- 3.
If all the decomposers were removed from an ecosystem, what would be the most likely result?
A.Producers would grow faster
B.Nutrients would remain trapped in dead matter
C.Energy would cycle faster
D.There would be no change
Download the worksheet for Ecology - Food Webs and Trophic Levels to practice offline. It includes additional chapter-level practice questions.
Nutrient Cycles (Carbon and Nitrogen)
SubtopicNutrient Cycles (Carbon and Nitrogen) under Ecology for Grade 9 IB.
Preview questions (no answers)
- 1.
Which of these accurately describes a 'closed system' in terms of matter (like carbon and nitrogen)?
A.Matter is constantly added from space
B.Matter is never reused
C.Matter cycles within the system and is not lost
D.Only energy can cycle; matter cannot
- 2.
Carbon dioxide enters the leaves of plants through which structure?
A.Roots
B.Stomata
C.Flowers
D.Bark
- 3.
What is the primary product of ammonification?
A.Nitrogen gas
B.Ammonium ()
C.Sugar
D.Oxygen
Download the worksheet for Ecology - Nutrient Cycles (Carbon and Nitrogen) to practice offline. It includes additional chapter-level practice questions.
Human Impact on the Biosphere
SubtopicHuman Impact on the Biosphere under Ecology for Grade 9 IB.
Preview questions (no answers)
- 1.
Which of these is a non-renewable source of energy?
A.Sunlight
B.Natural gas
C.Tides
D.Heat from the Earth
- 2.
What is 'smog'?
A.A type of healthy mountain mist
B.A mixture of smoke and fog that causes air pollution
C.Pure oxygen found in forests
D.A type of cloud that only produces snow
- 3.
What is the main purpose of the '3 Rs' (Reduce, Reuse, Recycle)?
A.To increase the amount of trash we produce
B.To conserve natural resources and minimize waste
C.To make products more expensive
D.To find more places to dig landfills
Download the worksheet for Ecology - Human Impact on the Biosphere to practice offline. It includes additional chapter-level practice questions.