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WorksheetsEcosystem Dynamics and Population Factors
Total questions: 20
Worksheet time: 10mins
What is the term for the maximum population size that can be supported by the available resources in an environment?
Biodiversity index
Carrying capacity
Population density
Resource threshold
In a food web, which organisms are considered primary producers?
Herbivores
Carnivores
Photosynthetic organisms
Decomposers
How do abiotic factors differ from biotic factors in an ecosystem?
Abiotic factors are living, while biotic factors are non-living
Abiotic factors are non-living, while biotic factors are living
Abiotic factors only affect plants
Biotic factors only affect animals
What typically happens to a predator population when prey population decreases?
Predator population increases
Predator population stays the same
Predator population decreases
Predators switch to eating plants
Which relationship best describes competition between organisms?
Both organisms benefit
One organism benefits while the other is unaffected
Both organisms are harmed
One organism benefits while the other is harmed
What is biodiversity?
The study of living organisms
The variety of life in an ecosystem
The number of predators in an area
The amount of available resources
In an energy pyramid, what percentage of energy is typically transferred to the next trophic level?
100%
50%
10%
1%
Which factor would NOT affect an ecosystem's carrying capacity?
Available water
Food supply
The color of animals
Living space
What happens when two species compete for the same limited resource?
Both species always die out
One species may be displaced or adapt
The species merge into one
Competition always benefits both species
How do decomposers contribute to energy flow in an ecosystem?
They produce their own food
They eat only plants
They break down dead organisms
They compete with predators
What is interdependence in an ecosystem?
When organisms live completely independently
When organisms rely on each other for survival
When only predators need prey
When plants compete for sunlight
Which is an example of an abiotic factor?
Bacteria in soil
Tree roots
Soil temperature
Earthworms
What typically happens when a population exceeds carrying capacity?
The population continues to grow
Resources become more abundant
Population size decreases
New species emerge
In a food web, what do arrows typically represent?
Direction of energy flow
Speed of animal movement
Plant growth direction
Weather patterns
Which statement about predator-prey relationships is correct?
Predator populations are always larger than prey populations
Prey populations never recover from predation
Predator and prey populations often cycle
Predators eat only one type of prey
What is the primary source of energy in most ecosystems?
Soil nutrients
The Sun
Water
Wind
How does increased biodiversity typically affect an ecosystem?
Makes it less stable
Makes it more stable
Has no effect
Reduces competition
What happens to energy as it moves through a food web?
It increases at each level
It stays the same
It is lost as heat
It is completely conserved
Which represents a biotic factor in an ecosystem?
Rainfall
Temperature
Plant diseases
Mineral content
How do limited resources affect populations?
They cause populations to decrease
They have no effect on populations
They increase population growth
They eliminate competition
