WorksheetsPopulations Study Guide
Total questions: 25
Worksheet time: 14mins
Which of the following would be DIRECT effects if the primary consumer population decreased?
a decrease in the secondary consumer
no impact on the food chain.
an increase in the population of secondary consumers.
an increase in the population of producers.
a decrease in the tertiary consumers
Which of the following would be INDIRECT effects if the primary consumer population decreased?
a decrease in the secondary consumer
no impact on the food chain.
an increase in the population of secondary consumers.
an increase in the population of producers.
a decrease in the tertiary consumers
If an ecosystem has more primary consumers (herbivores) than tertiary (carnivores), is the ecosystem in homeostasis?
yes, there is enough herbivores to feed the carnivores
yes, herbivores breed faster
no, carnivores will eat all the herbivores
no, carnivores are top of food chain, there needs to be more
Balance in an external and internal system is defined as...
homeostasis
trophic cascade
diffusion
keystone species
Group of organisms that if removed cause a large negative effect on its ecosystem
trophic cascade
abiotic species
carnivores
keystone species
Indirect effect as a result of a change in one group of species in an ecosystem.
trophic cascade
abiotic species
biotic species
keystone species
If there were less limiting factors...
carrying capacity would increase
carrying capacity would decrease
carrying capacity would remain the same
more species would be introduced
The removal of a trophic level affects other trophic levels in a phenomenon known as...
trophic cascade
Green World Effect
keystone species
Homeostasis
energy pyene
Removing the secondary consumers will result in...
More energy for the tertiary consumer
Decreased producer populations
Decreased primary consumer populations
Increased tertiary consumer populations
After the removal of a keystone species (otter), biodiversity...
increases
decreases
remains the same
switches
Comparing the ecosystem between 1900 and 1960, the ecosystem...
is still in homeostasis
is not in homeostasis
homeostasis is created
homeostasis is not affected
What is the carrying capacity of the population?
250
300
200
there is no carrying capacity
What is the carrying capacity of this population?
1.5 million
1.8 million
2 million
there is no carrying capacity because this population fluctuates a lot
Which of these will decrease the carrying capacity?
increase in diseases
increase in drinkable water
increase in available mates
decrease in predators
Small spiders hide better, larger spiders are able to hunt more prey. What kind of selection is this?
stabilizing
disruptive
directional
artificial
Black snakes overheat in the Arizona desert, white snakes are easily spotted by predators. The intermediate brown snake can hide better in its surrounding environment. What kind of selection is this?
stabilizing
disruptive
directional
artificial
A helpful trait that allows organisms to survive and reproduce
variation
overproduction
adaptation
descent with modification
Surviving individuals reproduce offspring with their traits
descent with modification
overproduction
adaptation
variation
Urchins in a population have many different colors and sizes.
variation
species
biodiversity
descent with modification
Which of the following examples best illustrates the role of a keystone species?
Bees pollinating flowers, helping plants reproduce across different ecosystems.
Wolves in Yellowstone National Park, whose hunting habits control elk populations and allow more diverse plant species to grow.
Deer grazing on grass in a forest, which provides them with food.
Salmon swimming upstream to lay eggs, which ensures the continuation of their species.
Over 10 generations, more polar bear cubs have been born with thick coats.
descent with modification (reproductive success)
adaptation
overproduction
variation
Many polar bears have ~2 cubs each but due to the extreme temperatures, many mothers only have one cub left.
descent with modification (reproductive success)
adaptation
overproduction
variation
With temperatures dropping rapidly, polar bears must be kept warm, or they will freeze to death.
descent with modification (reproductive success)
adaptation
overproduction
variation
Polar bear fur varies in thickness in a population.
descent with modification (reproductive success)
adaptation
overproduction
variation
Match the following
when one population increases, the other increases as a result
positive feedback
when one population decreases, the other decreases as a result
positive feedback
when one population increases, the other decreases as a response
negative feedback
a decrease in body temperature results in vasodilation to increase blood flow through the body
negative feedback
