What are decomposers responsible for?
Competing with producers for resources
Producing energy from sunlight
Hunting prey for food
Breaking down dead organisms into simpler substances
What happens when a food source becomes scarce in an ecosystem?
The ecosystem remains unchanged
Energy flow is unaffected
Species will adapt quickly without competition
Competition among living organisms increases
Which relationship benefits one organism without harming the other?
Commensalism
Predation
Mutualism
Competition
What is the path of energy transfer from one organism to another called?
Trophic cycle
Food chain
Energy web
Nutrient loop
How much energy is transferred from one level to the next in the energy pyramid?
50%
90%
100%
10%
What type of relationship exists when two individuals compete for limited food resources?
In mutualism, how do the interacting species affect each other?
One benefits, the other is unaffected
Both are harmed
Both benefit
One benefits, the other is harmed
Which teeth are most prominent in carnivores like lions for tearing prey?
Incisors
Canines
Molars
Premolars
What is the path of energy transfer in the form of food from one organism to another called?
Energy cycle
Food web
. Which of the following is the smallest unit of classification in an ecosystem?
Biological community
Population
Individual
Biotic population
. What is the relationship called when two individuals of the same species compete for limited food?
Intraspecific competition
Interspecific competition
Symbiosis
What is the main source of energy for all living organisms on Earth?
Water
Sun
Soil
Wind
What is a trophic level?
A type of consumer in the food chain
A level of producers in an ecosystem
A level for decomposers
A stage where energy is transferred in the food chain
Which nutritional relationship benefits one organism while harming the other?
If primary consumers increase, what happens to producers?
Stay the same
Become omnivores
Decrease
Increase
What does the term "ecosystem" refer to?
Only living organisms
Only the interactions between species
Only non-living components like water and air
Both living organisms and non-living components like water, air, and soil
. Which organism occupies the first trophic level in a food chain?
Decomposers
Carnivores
Producers
Herbivores
In commensalism, how are the two organisms affected?
Both are unaffected
What is the process of using living organisms to control agricultural pests called?
Genetic modification
Biological control
Natural selection
Sustainable farming
Which of the following is an example of biological control?
Using pesticides to kill insects
Cutting down infected plants
Irrigating fields with chemicals
Using ladybugs to eat aphids
What type of teeth are most herbivorous animals, like the horse, adapted with?
Teeth for tearing prey
Sharp canines
Flat molars
Incisors for cutting plants
What is the result of the absence of a species in a balanced ecosystem?
The remaining organisms in the food chain may be disrupted
All organisms thrive without the species
The ecosystem adapts and maintains balance
Only producers are affected
What are decomposers responsible for in an ecosystem?
Producing food for other organisms
Consuming herbivores
Breaking down organic substances in dead organisms
Eating both plants and animals
What is the fundamental unit in the classification of living organisms?
Community
Ecosystem
Species
Which of the following is an example of commensalism?
fungi and algae forming lichen
Egyptian plover birds cleaning a crocodile’s teeth
A tapeworm living inside a human intestine
Wolves hunting deer
What happens if the number of primary consumers increases?
The number of secondary consumers decreases
The number of producers decreases and secondary consumers increase
The number of tertiary consumers decreases
The number of producers increases
What happens to the energy when it moves from one trophic level to the next?
The energy doubles
90% of energy is lost
Energy stays constant
All energy is transferred
What is a food web?
A diagram showing energy transfer in a food chain
A single food chain
A network of interconnected food chains
A list of producers and consumers
. Which of the following animals is known as an omnivore?
Lion
Bear
Horse
Eagle
What are organisms that feed on dead remains called?
Scavengers
Parasites
What is formed when multiple food chains interconnect?
Scavenger network
Energy pyramid
Trophic loop
What is the role of the bees in the mutualistic relationship with plant flowers?
Bees are harmed by the flowers
Bees protect the flowers from predators
Bees compete for nectar with other bees
Bees transfer pollen grains, promoting floral reproduction
Which of the following is an example of predation?
An animal eating another animal for food
A bird feeding on leftovers from a crocodile’s teeth
Two individuals of the same species fighting over food
Bees extracting nectar from flowers
What do we call organisms that eat both plants and animals?
Omnivores
Which of the following is an example of mutualism?
Bees pollinating flowers while collecting nectar
A lion hunting a zebra
A bird eating insects from a crocodile’s teeth
Two plants competing for sunlight
Which of the following describes a biological community?
Only abiotic factors in an area
Different populations of species living in the same environment
A single living organism
Living and non-living components interacting
What is the main source of energy for producers in an ecosystem?
Air
A decrease in secondary consumers would lead to:
Fewer tertiary consumers
More primary consumers
Both a and b
More producers
What happens to the remaining 90% of energy not transferred to the next level?
Stored forever
Converted to sunlight
Lost as heat or used for metabolism
Recycled by decomposers
Which of the following is always the first trophic level in a food chain?
Producer
Carnivore
Herbivore
Decomposer
. What is a biotic population?
The various populations of different species living in the same environment
A group of individuals of the same species living in a particular area at the same time
An individual organism from a species
A group of individuals from different species
What is the role of the energy pyramid in an ecosystem?
It shows the number of organisms at each trophic level
It tracks nutrient cycling in ecosystems
It illustrates competition in the food chain
It represents the energy flow and amounts between trophic levels
What results from a lack of food sources in an ecosystem?
Increased cooperation
More energy for all
Reduced competition
Increased competition
Which of the following is an example of a scavenger?
Hyena
Ladybug
What happens in a competitive relationship between two individuals of the same species?
Both individuals compete for a limited food source, negatively impacting their growth or survival
Both individuals benefit without causing harm to each other
One individual benefits and the other is harmed
They both benefit from each other
. What is the role of scavengers in the ecosystem?
They break down organic substances in the soil
They are primary producers
They feed on the remains of dead organisms
They feed on both plants and animals
What happens if an organism is removed from a balanced ecosystem?
Only decomposers are affected
Disruption or destruction of ecological balance
Immediate collapse of all food webs
No effect on other organisms
Where is the greatest amount of energy found in the energy pyramid?
At the base of the pyramid
At the middle of the pyramid
At the top of the pyramid
At the secondary consumers level
Where is the top predator located in the energy pyramid?
Apex
Base
Middle
Not included
What is a group of individuals of the same species living in the same place at the same time called?
Biotic factor