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WorksheetsEC-25
Total questions: 127
Worksheet time: 1hrs 4mins
Which concept best aligns with understanding how organisms interact and how these interactions influence population stability over time?
Ecosystem dynamics
Molecular stoichiometry
Plate tectonics
Quantum entanglement
The primary purpose of the module is to equip learners with which of the following?
Historical timelines of geology
An understanding of ecosystem dynamics and conservation strategies
Advanced calculus techniques
Laboratory safety certification
Which pair of key concepts most directly supports designing actions to protect biodiversity while maintaining ecological function?
Ecological principles and Conservation strategies
Atomic orbitals and Wave functions
Classical mechanics and Thermodynamics
Gene editing and Proteomics
A learning outcome states that students should be able to apply ecological principles to real-world problems. Which task best demonstrates this outcome?
Memorizing the names of biomes
Calculating the mean of a dataset without context
Proposing a management plan to stabilize a degraded wetland
Reciting the definition of photosynthesis
Which term best describes environmental changes or effects resulting from human activities?
Biogenic
Anthropogenic
Abiotic
Autochthonous
Eutrophication most directly refers to which ecological process?
Increase in biodiversity due to habitat fragmentation
Nutrient enrichment of water bodies leading to algal blooms
Reduction in greenhouse gases through carbon sequestration
Introduction of non-native predators to an ecosystem
In a content mapping framework for a module, what is the primary purpose of mapping outcomes to content sections?
To replace assessments with glossaries
To align learning objectives with specific instructional materials
To remove overlap between different textbooks
To standardize grading rubrics across schools
Which option best matches the role of a glossary in a science module?
Lists experimental results for replication
Provides curated definitions of key terms to ensure common understanding
Summarizes entire chapters into bullet points
Offers biographies of scientists mentioned in the text
Which scenario exemplifies an anthropogenic cause of eutrophication?
Seasonal leaf fall increasing detritus in streams
Upwelling bringing nutrients to coastal waters
Agricultural fertilizer runoff entering a lake
Volcanic ash deposition after an eruption
Which statement best distinguishes anthropogenic impacts from natural ecological processes?
Anthropogenic impacts originate from human actions, whereas natural processes occur without direct human influence
Both anthropogenic impacts and natural processes are exclusively abiotic
Natural processes are always beneficial; anthropogenic impacts are always harmful
Anthropogenic impacts only occur in urban ecosystems
A module outcome states: “Explain the drivers and consequences of eutrophication.” Which content element in a vocabulary-focused section most directly supports achieving this outcome?
A timeline of famous limnologists
A detailed map of river basins
A glossary entry defining eutrophication and related terms such as nutrients and algal bloom
A photo gallery of lakes at sunset
Which pair is most appropriately matched in a glossary of ecological terms?
Anthropogenic — nutrient upwelling from deep ocean currents
Eutrophication — algal bloom resulting from nutrient enrichment
Succession — immediate ecosystem collapse due to pollution
Keystone species — a species with no effect on community structure
Which pair correctly matches the sensory modality with a key role described in animal communication?
Sound — long-distance transmission of messages
Scent — limited longevity and rapid decay
Touch — effective over long distances
Sight — universally effective in dense habitats
According to the text, which example best illustrates the use of smell in animals?
Lions coordinating a hunt using roars
Fruit bats determining if a fruit is ripe
Antelopes signaling with white tail patches
Grasshoppers chirping with hind legs
What is Jacobson’s organ primarily associated with in mammals?
Detecting polarized light for navigation
Combining functions of smell and taste
Amplifying ultrasonic vocalizations
Balancing during rapid movement
Which statement about sound signals is supported by the material?
They are ineffective in nocturnal species due to low light.
They cannot travel beyond a few hundred meters.
They can carry different meanings, acting like a language.
They are always produced only by the larynx.
Scent marks are advantageous because they can:
Travel thousands of kilometers across oceans
Transmit information even when the signaler is absent
Only indicate territorial boundaries
Be detected only by species with Jacobson’s organ
In which situation is touch most important as a communicative modality?
Coordinating over kilometers in open plains
Bonding and organizing social groups at short range
Communicating through dense forests over long distances
Signaling reproductive status to distant mates
What visual feature is cited as an effective cue in open habitats for large diurnal animals?
Ultraviolet reflective fur only visible at night
Distinct body markings like the white tail of a springbok
Subsonic vibrations transmitted through soil
Rapidly decaying scent plumes
Which finding best supports the benefits of group foraging among social carnivores?
Solitary wolves consistently capture adult zebras.
African wild dogs in small packs specialize on adult zebras.
Lions in groups of four or more can hunt buffalo and increase per capita food intake.
Whales use songs to coordinate hunts over thousands of kilometers.
Which statement best defines ecology in the context of basic ecological study?
The study of how energy is produced in power plants
The study of interactions among organisms and between organisms and their environment
The classification of organisms based on morphology alone
The economic valuation of natural resources
In an ecosystem, which pathway correctly describes the general direction of energy flow?
Decomposers → Primary producers → Sun
Consumers → Producers → Sun
Sun → Primary producers → Consumers → Decomposers
Sun → Consumers → Producers → Decomposers
Biomass in an ecosystem most accurately refers to which of the following?
The total number of species present
The total mass of living organisms in a given area or trophic level
The amount of heat released by respiration
The total volume of water available to organisms
Which statement aligns with the Second Law of Thermodynamics as applied to ecosystems?
Energy transfers in food webs are 100% efficient with no loss
Entropy decreases in closed systems over time
Energy transfer between trophic levels is inefficient, with some energy dissipated as heat
Matter is created during photosynthesis
A researcher models an ecosystem’s trophic pyramid and predicts only about 10% of energy is transferred from one level to the next. Which ecological principle most directly justifies this prediction?
Law of Conservation of Mass
Second Law of Thermodynamics and energy dissipation
Hardy–Weinberg equilibrium
Competitive exclusion principle
Which statement best defines gross primary production (GPP) in an ecosystem?
The rate at which heterotrophs convert ingested food into biomass
The total rate at which photosynthetic organisms convert solar energy into chemical energy
The energy remaining after respiration available to consumers
The total biomass of decomposers over time
Net primary production (NPP) is most accurately described as:
GPP minus respiration by primary producers
Energy intake by secondary consumers
Total energy fixed by photosynthesis
Nutrient loss through leaching
In terrestrial ecosystems, which factor most commonly limits primary production at biome scales?
Light intensity
Temperature and water availability
Grazing pressure
Salinity gradients
Which scenario is a classic trigger for eutrophication in lakes?
Increased sediment load reduces light penetration
Nutrient enrichment from nitrogen and phosphorus inputs stimulates algal blooms
Introduction of a new top predator reduces zooplankton
Declining water temperature during winter
A likely immediate consequence of an algal bloom during eutrophication is:
Higher dissolved oxygen at night due to photosynthesis
Lower decomposer activity due to limited detritus
Oxygen depletion following decomposition of algal biomass
Permanent increase in fish species richness
Secondary production refers to:
Energy fixed by autotrophs
Energy lost as heat during respiration by plants
The formation of biomass by heterotrophs from consumed organic matter
Nutrient uptake by roots from soil
Which process primarily returns nitrogen to the atmosphere in nutrient cycles?
Nitrification
Denitrification
Ammonification
Nitrogen fixation
Decomposition rates in ecosystems generally increase with:
Lower temperature and drier conditions
Higher temperature and moisture, and with litter of lower lignin content
Greater salinity and low oxygen
Reduced microbial diversity
A researcher compares NPP between two lakes. Lake A is phosphorus-limited, while Lake B is nitrogen-limited. Adding which nutrient to each lake would most directly increase its NPP?
Add nitrogen to Lake A and phosphorus to Lake B
Add phosphorus to Lake A and nitrogen to Lake B
Add carbon to both lakes
Add silica to both lakes
Which best explains why NPP in many open-ocean regions is low despite abundant light?
Low temperatures limit photosynthetic enzyme activity
Nutrient scarcity due to stratification limits phytoplankton growth
Excessive grazing by zooplankton eliminates all phytoplankton
High turbidity reduces light to zero
Which statement best describes optimality theory as applied in ecology?
It states that organisms always choose the most abundant food item.
It suggests there exists a solution that maximizes a desired outcome, helping predict animal behaviour and decisions.
It focuses solely on predator avoidance and ignores reproduction.
It assumes all food types have identical costs and benefits.
What is the primary goal assumed in optimal foraging decisions when comparing food options?
Maximizing the intake of a specific aspect of food, such as energy or a key nutrient
Minimizing exposure to new habitats
Maintaining equal time spent on all patches
Choosing the rarest available food
Which factor is NOT listed as influencing the choice between foods in optimal foraging theory?
Differences in type and size of food
Nutritional value
Risk of exposure to danger
Seasonal migration routes
According to the text, natural selection favours strategies that are most beneficial in terms of which outcomes?
Growth rate and territory size
Survival and reproduction
Species diversity and niche width
Learning speed and memory
Which example aligns with optimal foraging theory?
A herbivore randomly alternates between grass and browse regardless of quality.
A predator pursues the closest prey without considering handling time.
An animal selects the food that provides the greatest profit after weighing benefits and costs.
A forager eats only one food type to avoid toxins.
In optimal foraging, what does the term profit most directly refer to?
Monetary value of food items
The net benefit after balancing benefits such as energy against costs like handling and risk
The number of prey captured per day regardless of effort
The average size of consumed prey
Which of the following is considered a cost in optimal foraging decisions?
Energy content of the food
Presence of toxins
Nutritional value
Availability of prey patches
If the goal is to maximise energy intake, which decision would be most consistent with optimal foraging reasoning?
Choosing the largest item regardless of search time
Selecting a search path and prey type that yield the greatest energy gain per unit time
Always storing leftover food instead of searching for new food
Avoiding all patches with any predators present
Which search strategy involves remaining in one location and waiting for prey to approach?
Active hunting
Sit-and-wait strategy
Patch switching
Nutrient maximisation
What does the marginal value theorem predict for a forager in patchy environments?
The time to spend in a patch based on distances between patches and the current rate of food discovery
That a forager should never leave a patch until it is completely depleted
That predators should always prefer larger patches regardless of prey availability
How prey will evolve to evade predators over generations
As a predator continues foraging within a patch and prey begin to evade, what happens to the availability of prey in that patch according to the text?
It increases due to aggregation.
It remains constant until the predator leaves.
It decreases over time.
It fluctuates randomly with no trend.
Which decision is explicitly listed as part of an optimal forager’s planning when aiming to maximise energy intake?
Selecting mating partners with high fitness
Determining what type of search path to use
Choosing migration destinations
Reducing body size to lower energy demand
Which pair correctly matches a factor with its classification under optimal foraging?
Energy content — benefit; time required to find food — cost
Handling difficulty — benefit; toxin presence — benefit
Risk of exposure to danger — benefit; size of food — cost
Nutritional value — cost; prey availability — cost
Which statement best captures the trade-off central to optimal foraging theory?
Foragers maximise benefits and ignore costs.
Foragers minimise costs even if benefits drop to zero.
Foragers balance benefits like energy gain against costs such as handling time and risk to choose the most profitable option.
Foragers prefer the rarest food item to reduce competition.
Behavioural ecology primarily studies which of the following?
The genetic code of organisms
How animal behavior contributes to survival and reproductive success in ecological contexts
The chemical composition of ecosystems
Geological changes affecting habitats
In behavioural ecology, what is meant by the adaptive value of behaviour?
How aesthetically pleasing a behaviour appears
The extent to which a behaviour increases an organism's fitness by improving survival or reproduction
The cost in metabolic energy of a behaviour
How frequently a behaviour occurs in a population
Which question reflects proximate causation of behaviour?
Why did weaver birds evolve colonial nesting?
How do hormone levels trigger nest-building in weaver birds?
What is the long-term advantage of social weaving?
Why is polygyny common in certain climates?
Which question reflects ultimate causation of behaviour?
What sensory cues cause a weaver bird to start weaving?
How do neural circuits coordinate weaving movements?
What ecological benefits led to the evolution of colonial nesting in weaver birds?
Which genes are expressed during feather growth?
Weaver bird social systems are often used to illustrate which pair of explanatory levels in behavioural ecology?
Genetic drift and natural selection
Microevolution and macroevolution
Proximate and ultimate causes
Innate and learned behaviour only
A researcher investigates whether higher predator density selects for tighter group cohesion in weaver bird colonies. This study focuses primarily on which level of causation?
Proximate causation, because it examines immediate triggers
Ultimate causation, because it addresses evolutionary function
Neither; it is taxonomy
Both, because it only measures hormone levels
Which of the following best differentiates proximate from ultimate explanations?
Proximate explains the evolutionary history; ultimate explains the mechanism
Proximate focuses on immediate mechanisms; ultimate focuses on adaptive significance
Both address only genetic causes
Proximate deals with populations; ultimate deals with individuals
If researchers manipulate light cues to test whether day length initiates weaver bird nest-building, what kind of question are they addressing?
Ultimate: fitness consequences
Proximate: environmental triggers and mechanisms
Taxonomic: species identification
Phylogenetic: historical relationships
Which statement best describes intrasexual sexual selection as presented?
Direct mate choice based on the opposite sex's phenotype
Indirect mate choice where traits enhance same-sex competition ability
Random selection with no fitness consequences
Selection for parental care behaviors only
In intersexual sexual selection, why might males evolve bright coloration despite increased visibility to predators?
Bright colors reduce metabolic costs
Females prefer bright males, potentially ensuring good genes for offspring
Predators avoid brightly colored males
Bright coloration improves male camouflage in all habitats
Which hypothesis proposes that a male's ability to bear the cost of a conspicuous feature signals general survival value, making him a more attractive mate?
Runaway selection hypothesis
Good genes hypothesis
Handicap hypothesis
Kin selection hypothesis
According to the runaway selection hypothesis, what is the primary reason a disadvantageous trait like a long tail can persist?
It improves foraging efficiency
Once sexual selection begins, preference amplifies the trait in an almost out-of-control spiral
It always enhances male survival against predators
It is required for thermoregulation
Dispersal in ecology refers to which of the following?
Only seasonal long-distance migration between continents
Local movements within a population that affect spatial patterns and movement between populations
Territorial defense without movement
Random genetic drift within a population
Which modality best fits signals transmitted as light patterns, colors, or body postures used to convey information among animals?
Visual communication
Auditory communication
Olfactory communication
Tactile communication
Acoustic songs, calls, and vibrations used by animals to convey information are examples of which communication type?
Visual communication
Auditory communication
Olfactory communication
Electrical communication
Which statement best describes olfactory communication in animals?
It relies on visual displays that require line-of-sight.
It uses airborne or waterborne chemical cues such as pheromones.
It is limited to physical contact between individuals.
It can only occur in daylight.
Touch-based signals that reinforce social bonds, such as grooming in primates, are categorized as:
Auditory communication
Tactile communication
Olfactory communication
Electrical communication
Which modality is generally most effective for long-distance signaling in dense forests during nighttime?
Visual communication
Auditory communication
Tactile communication
Electrical communication
A species evolves bright warning coloration to deter predators. Which sense of the receiver does this primarily target?
Hearing
Vision
Smell
Touch
Pheromone trails laid by ants to recruit nestmates to food primarily function as:
Auditory signals that travel quickly but fade fast
Visual signals that require direct line-of-sight
Chemical signals that can persist and guide others
Tactile signals requiring direct contact
In open ocean environments where visibility can be limited, which pair of communication modes is most likely favored for effective information transfer?
Visual and tactile
Auditory and olfactory
Tactile and visual
Electrical and tactile
Which scenario best illustrates multi-modal communication?
A bird emitting an ultrasonic call only
A lizard changing color only
A wolf howling only
A frog producing a call while inflating a brightly colored vocal sac
Compared to auditory signals, chemical signals (like pheromones) are generally:
Shorter-lasting and travel less far
Longer-lasting but may be slower to transmit
Not usable under water
Only effective with direct physical contact
Which communication type is best suited for private, short-range signaling that reduces detection by predators?
Olfactory communication via long-lasting trails
Auditory communication with loud calls
Visual communication using subtle body postures
Broadcast pheromones released into the wind
Which of the following is a key trade-off animals face when using visual signals?
They are effective at night without any light.
They persist long after the sender departs, reducing ambiguity.
They require line-of-sight and adequate illumination.
They cannot encode information about identity or status.
Which term best describes animals forming associations that influence foraging efficiency and safety from predators?
Group living
Territoriality
Solitary hunting
Parasitism
What is the primary benefit of foraging in groups when prey items are patchy and unpredictable?
Reduced competition for food
Increased individual search efficiency through shared information
Lower energy expenditure due to fasting
Guaranteed access to the largest prey
In the context of group living, what does the dilution effect refer to?
Predators being less motivated to attack large groups
Each individual’s risk of predation decreasing as group size increases
A reduction in prey density within a habitat
Toxins being diluted in the bloodstream of group members
Which concept predicts that there is a group size at which the net benefit to each member is maximized?
Dominance hierarchies
Optimal group size
Kin selection threshold
Predator saturation
Which of the following is a potential cost of group living for foraging animals?
Improved vigilance
Lowered disease transmission
Increased competition for food within the group
Enhanced detection of predators
Why can dominance hierarchies improve the stability of groups?
They eliminate the need for food entirely
They structure access to resources and reduce constant fighting
They increase the number of predators around the group
They ensure all individuals reproduce equally
When vigilance behavior is shared among group members, what is the predicted effect on individual time spent scanning?
It increases for all individuals
It remains unchanged
It decreases because of collective detection
It becomes unpredictable
Which scenario best illustrates predator confusion as a group-living benefit?
A flock disperses widely to cover more ground
A school of fish moves in synchronized patterns, making it hard for a predator to target one fish
A herd splits into pairs to evade detection
A meerkat sentry stands alone while others forage
According to optimal group size ideas, why might groups become larger than the size that maximizes individual benefit?
Individuals can always control group membership precisely
Joining groups imposes no costs
Immigration by new members yields benefits to joiners even if residents face reduced payoffs
Predation risk always rises with group size
Which statement aligns with the trade-off faced by group-foraging predators?
Group hunting always reduces handling time without costs
Cooperative hunting can increase success on large prey but may require sharing the catch
Group hunting eliminates the need for coordination
Solitary hunting provides identical benefits at any prey size
What feature of dominance hierarchies most directly affects food intake variation among group members?
Linear or despotic rank order influencing priority of access
Random assignment of turns at feeding sites
Uniform division of food regardless of status
Seasonal temperature shifts
Which mechanism reduces per capita vigilance demands in larger groups?
Resource partitioning within individuals
Many-eyes effect where multiple individuals monitor for predators
Territorial scent-marking
Increased scramble competition
Which term describes a defended area within which an animal or group excludes conspecifics to secure resources?
Home range
Territory
Niche
Habitat patch
What is the key difference between a territory and a home range?
A territory is always larger than a home range
A home range requires active defense; a territory does not
A territory is actively defended; a home range is used without exclusive defense
A home range is used only during breeding season
According to cost–benefit analysis of territoriality, which outcome best describes optimal territory size?
The largest area an animal can possibly defend
The size that maximizes net benefits where marginal benefits equal marginal costs
The smallest area that contains any resources
A fixed species-specific area independent of resource density
Which of the following is typically a cost of maintaining a territory?
Increased mating opportunities
Reduced predation risk
Time and energy spent on defense and patrolling
Guaranteed access to all resources in the habitat
Which scenario would most likely increase the benefit of territoriality?
Resources are abundant and evenly distributed
Resources are scarce, clumped, and economically defensible
Population density is extremely low
Intruders pose no threat to resource access
Optimality theory in behavioural ecology is primarily used to do what?
Prove that all animal behaviors are perfect
Predict which behavioral strategy maximizes fitness given constraints and trade-offs
Describe phylogenetic relationships among species
Explain genetic drift in small populations
In optimal foraging theory, what does the 'currency' often represent?
Number of prey types encountered
Net rate of energy intake per unit time
Total distance traveled during foraging
Probability of being preyed upon
The Marginal Value Theorem predicts that a forager should leave a patch when:
The instantaneous intake rate in the patch falls below the average intake rate in the environment
All resources in the patch are completely depleted
Travel time between patches is shortest
Competitors first arrive in the patch
Which factor would increase the predicted optimal time a forager should spend in a patch, according to the Marginal Value Theorem?
Shorter travel time to the next patch
Higher average environmental intake rate
Longer travel time between patches
Faster initial gain curve in the current patch
When deciding whether to specialize or generalize in diet, the optimal diet model predicts that a predator should add a prey type to its diet when:
The prey is rare but large
The encounter rate with preferred prey is high
The energy gain from the new prey minus handling costs increases overall energy intake rate
Handling time for preferred prey is short
Which search strategy is most consistent with optimal foraging when prey are patchily distributed and detection improves with movement?
Sit-and-wait at a single point
Area-restricted search that increases turning rate after a capture
Random straight-line movement regardless of captures
Always return to the same patch after each capture
Territorial behavior is least likely to be favored when:
Resource renewal rates are high and evenly spread
Intrusion pressure is high and defense costs are high
Resources are clumped and predictable
Competitors can be excluded effectively
Which term describes a long-term social and/or sexual association between two individuals that can influence parental care and mating opportunities?
Pair bond
Sperm precedence
Promiscuity
Dominant species
In behavioural ecology, which mating system involves one male mating with multiple females within a breeding season?
Monogamy
Polygyny
Polyandry
Promiscuity
Which mating system is characterized by one female mating with multiple males, often associated with high male parental investment or resource defense by females?
Polygyny
Polyandry
Serial monogamy
Lekking
Promiscuity in animals is best defined as
exclusive pair bonds for life
individuals mating with multiple partners without lasting pair bonds
one male defending a harem of females
females exclusively choosing a single mate
Which scenario most clearly exemplifies social monogamy rather than genetic monogamy?
A pair raises offspring together but engages in extra-pair copulations
A pair mates exclusively and shares parenting
One male mates with several females who each raise young alone
Males display collectively in a lek with no parental care
Sexual selection is a subset of natural selection that arises from
differential survival due to predation
differences in mating success among individuals
random genetic drift
environmental disturbances like fire
Mate choice typically leads to the evolution of
traits that increase foraging efficiency only
conspicuous ornaments or displays that signal genetic or resource quality
reduced variation in secondary sexual traits
strict lifelong pair bonds
Which outcome is most directly associated with sperm precedence?
Earlier-mating males gain a fertilization advantage
Later-mating males gain a fertilization advantage
Females prevent all sperm competition
Males avoid mate guarding
In a species with intense male–male competition and minimal male parental care, which mating system is most likely?
Monogamy
Polygyny
Polyandry
Obligate cooperative breeding
Consider a bird species where females rely on scattered, defensible food patches that males rarely help exploit. Females compete for high-quality territories and males provide intensive parental care to gain mating opportunities. Which mating system is most consistent with this ecology?
Polygyny
Polyandry
Promiscuity
Genetic monogamy
Lekking is most closely linked to which combination of features?
Resource defense and biparental care
Male aggregations for display and strong female choice, with little male parental care
Exclusive pair bonds and equal parental investment
Female defense and male parental care
Which statement best contrasts social monogamy and genetic monogamy?
Both require exclusive mating with no extra-pair fertilizations
Social monogamy refers to pair-living and shared care; genetic monogamy means all offspring are sired by the social partner
Genetic monogamy refers to cohabitation only; social monogamy means exclusive paternity
Neither involves pair bonds
Which term describes species that have a disproportionate effect on community structure relative to their abundance?
Indicator species
Keystone species
Invasive species
Foundation species
According to the material, which process directly shortens average food chain length in a habitat?
Increased primary productivity
Greater habitat complexity
Larger patch size
Disturbance
A predator that feeds on the best competitor is removed from a community. What is the most likely ecological outcome described?
The best competitor declines due to lack of prey
The best competitor expands and may exclude other species
All species increase equally
Food chain length increases substantially
Which statement best distinguishes dominance from diversity in a community?
Dominance is the opposite of diversity because both measure species richness
Dominance is unrelated to evenness and only reflects biomass
Dominance is the opposite of evenness; a community can be diverse yet have dominant species
Dominance and diversity always increase together
Which pair correctly matches an ecosystem engineer and its primary physical alteration of the environment?
Beavers — open bush to create grazing patches
Elephants — build dams that create wetlands
Beavers — build dams that alter water flow
Elephants — construct coral-like reef structures
Which term best describes interactions where both species benefit from the association?
Mutualism
Commensalism
Amensalism
Parasitism
Allelopathy
In interspecific competition, which statement is most accurate?
It occurs among individuals of the same species
It involves predator–prey dynamics only
It occurs between different species using overlapping resources
It requires direct physical confrontation to occur
Which outcome is predicted by the competitive exclusion principle when two species compete for exactly the same limiting resource in a stable environment?
Both species will indefinitely coexist at lower densities
One species will eventually eliminate the other locally
The weaker competitor will evolve instantly into a new species
Predation will increase until both species go extinct
Which option best defines an ecological niche?
The geographic area a species inhabits
A species’ role, resource use, and environmental tolerances
Only the trophic level a species occupies
The set of symbiotic partners a species interacts with
Which pairing correctly matches a symbiosis with its effect on partners?
Mutualism: one harmed, one unaffected
Commensalism: both benefit
Parasitism: one benefits, one harmed
Amensalism: both harmed
Amensalism is best illustrated by which scenario?
Both species benefit equally from cooperation
One species is harmed while the other is unaffected
One species benefits and the other is harmed
Both species are unaffected
Allelopathy most specifically refers to:
Chemical inhibition of one plant by another
Nutrient sharing among mycorrhizae and plants
Defensive mutualisms among animals
Behavioral territoriality within a species
Intraspecific competition primarily involves:
Individuals of different species competing for food
Individuals of the same species competing for shared resources
Predators competing with prey
Species interacting through commensalism
Two lizard species feed on identical insect prey at the same time of day in the same microhabitat. Which concept best predicts their long-term coexistence outcome without niche differentiation?
Niche complementarity
Competitive exclusion principle
Facultative mutualism
Trophic cascade
A species broadens its diet to include different seed sizes when a competitor is absent, but narrows its resource use when the competitor is present. This pattern exemplifies:
Character displacement
Realized niche versus fundamental niche
Apparent competition
Keystone mutualism
Which of the following most likely reduces niche overlap between competing species, facilitating coexistence?
Temporal partitioning of resource use
Increase in shared predators
Identical habitat preferences
Exclusive reliance on the same limiting nutrient
Which interaction explicitly involves one organism deriving nutrients at the expense of another, often without immediately killing it?
Commensalism
Parasitism
Mutualism
Amensalism
