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WorksheetsGE ELECT SUMMATIVE TEST
Total questions: 50
Worksheet time: 25mins
Which of the following is a biotic factor in an ecosystem?
Temperature
Sunlight
Soil bacteria
Water
Which of the following best describes abiotic factors?
Living components of an ecosystem
Non-living components affecting life
Human-made materials
Recycled organic matter
A predator-prey relationship is an example of:
Abiotic interaction
Biotic interaction
Chemical cycle
Geological process
Which abiotic factor most directly affects the distribution of desert organisms?
Soil nutrients
Amount of water
Number of predators
Plant diversity
Sunlight plays a major role in ecosystems because it:
Provides oxygen
Serves as an energy source for producers
Breaks down waste
Controls rainfall
Soil type influences an ecosystem by:
Determining available minerals for plants
Producing new species
Reducing biodiversity
Absorbing carbon dioxide
Temperature affects living organisms by influencing their:
Feeding habits
Adaptation and metabolic rate
Predator behavior
Evolution rate only
Which of the following is an example of a biotic factor affecting another?
Rainfall washing away soil
Tree roots absorbing minerals
Sunlight causing evaporation
Wind shaping a dune
The producers in an ecosystem are:
Animals
Plants and algae
Fungi
Decomposers
The decomposers are vital because they:
Store energy
Break down dead matter
Produce sunlight
Reduce soil erosion
An ecosystem is made up of:
Only plants and animals
All living and non-living things in an area
Only non-living things
Only humans and animals
Which of these would be considered abiotic in a forest?
Bird
Tree
Rock
Fungus
A population is:
A group of ecosystems
A group of the same species living together
Different species in an area
The environment around animals
A community in ecology refers to:
One organism
A group of different populations living together
Abiotic conditions
Biomes with similar climate
Water availability in an area affects:
Food chain direction
Growth of producers
Ocean currents
Movement of stars
The carrying capacity of an environment depends on:
Weather only
Availability of resources
Predator migration
Natural disasters
Competition among species happens because:
They share unlimited resources
They require similar limited resources
They live in different habitats
They never interact
Which pair represents biotic and abiotic interaction?
Fish swimming with other fish
Plants absorbing sunlight
Rocks breaking down into soil
Rainwater forming rivers
Microorganisms in soil help maintain balance by:
Producing sunlight
Decomposing matter and recycling nutrients
Reducing oxygen
Increasing water evaporation
Which of the following is not a biotic factor?
Fungi
Temperature
Bacteria
Animals
The matter in an ecosystem is:
Constantly lost into space
Recycled through biotic and abiotic parts
Created by sunlight
Only present in living things
The carbon cycle involves:
Movement of water
Transfer of carbon among organisms and environment
Production of nitrogen gas
Only photosynthesis
In the nitrogen cycle, bacteria are important because they:
Eat plants
Convert nitrogen into usable forms
Produce rainfall
Absorb oxygen
Photosynthesis is crucial to the carbon cycle because it:
Adds carbon dioxide to the atmosphere
Removes carbon dioxide from the air
Reduces plant growth
Produces nitrogen
Decomposers return nutrients to the soil by:
Absorbing sunlight
Breaking down organic matter
Preventing erosion
Producing oxygen
The water cycle includes all EXCEPT:
Evaporation
Condensation
Precipitation
Photosynthesis
Energy flow in an ecosystem differs from matter flow because energy:
Cycles continuously
Flows in one direction and is lost as heat
Is stored permanently
Increases as it moves up the food chain
Producers get energy from:
Eating other organisms
The sun through photosynthesis
Decaying matter
Absorbing nitrogen
In a food chain, which level contains the most energy?
Producers
Primary consumers
Secondary consumers
Tertiary consumers
Matter moves through ecosystems via:
Food chains and nutrient cycles
Energy loss
Evaporation only
Soil erosion
The oxygen cycle depends mainly on:
Respiration and photosynthesis
Condensation
Precipitation
Soil nutrients
Human activity affects the carbon cycle by:
Burning fossil fuels
Producing rainfall
Reducing nitrogen
Increasing ozone
Deforestation influences the carbon cycle because it:
Increases carbon absorption
Reduces carbon dioxide uptake
Produces new nutrients
Stops the nitrogen cycle
Photosynthesis and respiration are part of which cycle?
Water
Carbon
Nitrogen
Phosphorus
In the nitrogen cycle, plants absorb nitrogen in the form of:
Ammonia or nitrates
Nitrogen gas
Oxygen
Carbon dioxide
Matter recycling in an ecosystem ensures:
Waste accumulation
Continuous supply of essential nutrients
Increase of carbon monoxide
Decrease in biodiversity
The law of conservation of matter states that:
Matter can be created
Matter is destroyed in ecosystems
Matter changes form but is not lost
Matter disappears in heat
Energy in ecosystems originates from:
Plants
The sun
Animals
Bacteria
The phosphorus cycle is unique because:
It involves only gases
It does not include an atmospheric phase
It occurs only in oceans
It depends on volcanic activity
Nutrient cycles are important because they:
Prevent pollution
Recycle essential elements for life
Destroy waste
Produce sunlight
Which statement best describes climate change?
A short-term change in weather
A long-term alteration in temperature and weather patterns
A brief shift in rainfall within a year
A local change in daily temperature
Global warming is primarily caused by:
Excessive release of greenhouse gases
Natural cooling of the oceans
Increased volcanic eruptions only
Changes in Earth’s orbit
The greenhouse effect is necessary for life on Earth because it:
Prevents all heat from escaping into space
Keeps Earth warm enough to sustain life
Increases UV radiation
Causes the planet to freeze
Which of the following gases contributes most to the enhanced greenhouse effect?
Nitrogen
Carbon dioxide
Oxygen
Argon
Deforestation contributes to climate change by:
Increasing carbon dioxide in the atmosphere
Reducing photosynthesis and carbon absorption
Both A and B
Producing more oxygen
Air pollution can lead to all of the following EXCEPT:
Respiratory diseases
Acid rain formation
Ozone layer restoration
Reduced visibility
Which of the following describes the ozone layer’s main function?
To trap heat
To block harmful ultraviolet radiation
To reflect sunlight
To increase carbon dioxide absorption
Coral bleaching occurs because:
Ocean temperatures rise, stressing corals and expelling algae
Ocean currents cool rapidly
Pollution increases coral pigmentation
Excess oxygen accumulates in the water
One of the major effects of melting polar ice caps is:
Decrease in sea levels
Rising sea levels that threaten coastal areas
Formation of more glaciers
Reduced global temperatures
Sustainable development can be best described as:
Using resources in a way that meets present and future needs
Consuming natural resources rapidly for profit
Ignoring environmental concerns to promote industry
Stopping all industrial activities
