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WorksheetsEcology AP Biology Growth Rates
Total questions: 24
Worksheet time: 12mins
Why does increasing producers increase the populations of all trophic levels?
Producers increase the size of a habitat
Producers help keep predator populations in check
With more energy available the carrying capacity increases
Producers do not have a large impact on population sizes
What is phototropism?
When a plant loses it's leaves in the fall
It is what causes a plants stems to grow upwards
When a plant grows towards light
A plants response to touch
How do cooperative behaviors increase fitness?
They ensure every organism in a colony survives
They make sure that every member of a colony gets along
They increase the fitness of the population, though may harm the individual
They allow each organism to obtain the most resources possible
What causes trophic cascades?
Increasing the number of producers
Pollution
The removal of a keystone species
Introducing a new species to an ecosystem
What types of organisms are producers?
autotrophs
apex predators
heterotrophs
keystone species
Where are autotrophs found in food chains/webs
In the middle
At every level
At the first level
At the top
What are limiting factors?
The maximum number of organisms an area can sustain
Scarce resources that limit the size of a population
Conditions that limit how much energy flows to the next trophic level
How diverse the populations of a community are
If the producer level of an ecosystem has 750,000 J of energy, how much energy would be passed on to the secondary consumers?
75,000 J
7,500 J
750 J
75 J
What type of graph represents exponential population growth?
A fluctuating graph
W - shaped curve
S-shaped curve
J - shaped curve
What does carrying capacity mean?
The amount of abiotic factors present in the environment
The total number of species living in an ecosystem
The number of offspring one mother can have in a year
The number of organisms an ecosystem can sustain
Frogs lay ~4000 eggs at a time. Based on this frogs would be classified as -
R-strategists
K-strategists
Which of the following would be a density independent limiting factor?
A virus spreading through a population
A forest fire burning down a forest
Birds competing for a limited amount of seeds
A new predator moving to an area
Which of the following would be a density-dependent limiting factor?
Two wolf packs having overlapping territories
Pollution
A flood
Deforestation
The carrying capacity for a population of lizards is 2700. If the current population is 1340 and the rmax for the population was found to be 0.83, what would the population size be after 1 year?
2356
2100
1825
1900
There is a population of 75 wolves in a forest that has a carrying capacity of 120. What is the maximum population growth rate if the population grows to 92 in one year?
0.833
1.00
0.604
0.523
Which of these describes a mutualistic relationship?
When one organism is harmed, but the other is benefitted
When one organism is unaffected, and the other is harmed
When one organism benefits, and the other is unaffected
When both organisms involved benefit
What is a niche?
A species that outcompetes others in an area
The level on a food chain an organism occupies
An organisms role in an ecosystem and the resources they obtain
A species that disproportionately affects an ecosystem
What will happen if two species occupy the same niche in an ecosystem?
The ecosystem will be stressed and could collapse
One species will either alter their niche or be eliminated
The niche will expand to accommodate both species
The species will share the niche
How does competition affect population?
Most populations do not have competition
It maximizes the carrying capacity of an ecosystem
It limits population sizes and drives natural selection
It benefits both species and increases their populations
How do ecosystems obtain energy in environments that have no light?
Through chemosynthetic organisms
Without light the organisms will need to move or they may go extinct
Through photosynthetic organisms
All ecosystems have some light
Why are decomposers necessary in ecosystems?
They recycle essential nutrients back down to producers
They enrich soil with nitrogen
They help keep ecosystems clean
All of the above
Why does high biodiversity increase ecosystem stability?
Ecosystems do best when populations are as large as possible
High biodiversity increases the carrying capacity of an ecosystem
More diversity increases the chances that organisms can survive changes to an ecosystem
Ecosystems are most stable when biodiversity is low
How do invasive species impact ecosystems?
The increase density dependent limiting factors
They establish themselves as new keystone species in an area
The open up new niches in the ecosystem
They outcompete native species and overpopulate the area
What are keystone species?
Non-native species that have adapted to a new environment
Species that have disproportionate effects on ecosystem stability
The first species to return to an area after a natural disaster
Organisms that can collapse an ecosystem if they overpopulate an area
