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Unit 1 Revision Flashcards | StudBud
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Unit 1 Revision
Unit 1 Revision
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Questions
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Answers
1
Which level has the least available energy in a food pyramid?
Tertiary consumers
Secondary consumers
Primary consumers
Producers
2
What is a keystone species?
One that helps spread seeds
A species that lives underground
A species that lives in trees
A species critical to ecosystem balance
3
Why are apex predators less abundant in ecosystems?
They occupy specialized niches.
They are immune to environmental changes.
They have unlimited food sources.
They reproduce rapidly.
4
What is the primary function of decomposers in an ecosystem?
They generate energy for producers.
They are top-level predators.
They recycle nutrients from dead matter.
They consume primary consumers.
5
Which organism is typically a secondary consumer?
Grass
Algae
Rabbit
Snake
6
How can abiotic factors influence biotic components in an ecosystem?
Soil type determines plant species.
Wind patterns shape bird migration.
All of the above.
Temperature affects animal behavior.
7
What is the role of producers in an ecosystem?
Break down waste
Consume herbivores
Hunt consumers
Convert sunlight into energy
8
Approximately what percentage of energy is transferred between trophic levels?
100%
10%
50%
1%
9
In a marine ecosystem, which organism is typically a primary producer?
Jellyfish
Tuna
Seaweed
Crab
10
What process do plants use to make their own food?
Photosynthesis
Respiration
Fermentation
Digestion
11
Which best describes a trophic level?
An underground habitat
A level in a food chain
A physical layer of soil
A type of ecosystem
12
What primarily influences animal migration patterns?
Random movements
Lunar cycles
Seasonal environmental changes
Daily weather changes
13
Which of the following is a non-renewable energy source?
Wind
Solar
Biomass
Coal
14
What can cause eutrophication in waterways?
Urban development
Excess fertiliser runoff
Animal migration
Tree planting
15
What is the role of consumers in a food chain?
Eat other organisms
Absorb nutrients from soil
Use sunlight to produce food
Break down dead matter
16
What is one result of increased carbon dioxide in the atmosphere?
Colder global temperatures
Ocean acidification
Decreased plant growth
More oxygen produced
17
A collection of interlinked food chains is referred to as a:
Food web
Nutrient cycle
Energy loop
Trophic network
18
What does a biomass pyramid illustrate?
Mass of organisms at each trophic level
Number of predators in an ecosystem
Water content in organisms
Energy produced by decomposers
19
Which human activity reduces biodiversity?
Building wildlife corridors
Reforestation
Deforestation
Planting native plants
20
What happens to energy as it moves up trophic levels?
It is lost as heat.
It is entirely conserved.
It increases at each level.
It returns to producers.
21
Why do certain plants bloom in specific seasons?
To maximize pollination opportunities.
To avoid predators.
Because of constant daylight.
Due to soil erosion.
22
What does biodiversity refer to?
Number of trees in an area
Variety of ecosystems only
Pollution levels in an area
Variety of species in an area
23
What happens if a producer is removed from a food web?
Consumers may run out of food
Energy increases in the system
Decomposers take over
Nothing changes
24
What is an example of an abiotic factor?
Worms
Grass
Insects
Rainfall
