WorksheetsEcosystem Stability
Total questions: 30
Worksheet time: 24mins
Which is a way humans can help increase biodiversity within an ecosystem?
establish a protection plan to reduce hunting
allow unlimited fishing and hunting
How much energy is available to be passed on to the next level in a food web?
100%
10%
50%
75%
If only 10% of the energy in the pyramid is available as you move from one trophic level to the next, what happens to the other 90%?
Passed on to decomposers
Metabolized and "lost" as heat energy and waste
Assembled into tissues of producers permanently
False statement - 100% of the energy is available
The removal of which organism will have the greatest effect on the ecosystem?
green plant
rabbit
kite
owl
Which ecosystem would have the most biodiversity?
an area where a volcano erupted
cutting grass in a meadow
a forest that has never been cut down
an area that experienced a natural disaster
There are 1,567 calories available at the producer level of this pyramid, and there are only 15.67 calories available at the secondary consumer level. Which of the following choices BEST explains why there is less energy available at the secondary consumer level?
There are less organisms at the secondary consumer level.
Secondary consumers can't do photosynthesis.
The secondary consumers are more likely to go extinct.
90% of energy is lost as it is transferred to the next trophic level.
What is the 10% rule in energy transfer between trophic levels?
The 10% rule applies only to plants and not to animals in the food chain.
The 10% rule states that 50% of energy is transferred between trophic levels.
The 10% rule indicates that energy is lost completely at each trophic level.
The 10% rule states that approximately 10% of energy is transferred from one trophic level to the next.
A species that is not native to an area is called:
Native Species
Natural Species
Nonnative Species
Symbiotic Species
What is competition?
an interaction between two species where both benefit
an interaction that occurs when two species compete for the same resource
when one animal eats another
a soccer game
What effect can overfishing have on an aquatic ecosystem?
overfishing makes the ecosystem more stable by increasing competition for limited resources
overfishing decreases the stability of the ecosystem by reducing the number of fish & disrupting food chains
overfishing has no effect on ecosystem's stability because it only affects one species
overfishing increases ecosystem stability by allowing prey populations to overproduce
The San Marcos salamander is found only in Spring Lake and a portion of the San Marcos River. What human activity would most likely decrease the ability of the salamanders to survive?
increasing water consumption that decreases the flow of clean water from the springs that feed the river
public transportation that reduces the number of automobiles that contribute to pollution
tourism that helps fund educational programs related to river ecosystems
the addition of a new food source into the river that limits competition
A farmer is trying to get rid of pest insects on his farm. He finds a bird predator of the pest insects and releases the bird onto his farm. How would releasing the bird onto the farm have a negative effect on the ecosystem?
the birds will increase biodiversity of native plants
the birds will pollinate native species of plants
the birds will consume beneficial insects as well as the pest
the birds will mate with native birds and create a variation in the population
When environmental changes occur (such as climate change), an ecosystem with __________ has a greater chance of survival.
genetic diversity
no plants
few bacteria
no diversity
Using the graph, which explains the relationship trend between the predator and the prey?
as predators increase prey remain at the same level
as prey increases the predators increase and when prey decreases predators decrease
predators and prey remain at a constant level at all times
there is no relationship between predators and prey
Excessive amounts of algae in aquatic ecosystems can block sunlight, consume needed oxygen, and reduce food sources for organisms. How does excessive amounts of algae in aquatic ecosystems affect the biodiversity of organisms?
biodiversity will increase because there are more organisms available to consume the algae
biodiversity decreases because the organisms that depend on sunlight & oxygen die off
biodiversity doesn't change because the algae has no effect on the other organisms
Remoras are fish that generally latch on to sharks and eat leftovers of food from the shark. This is an example of which type of ecological relationship?
Mutualism
Commensalism
Parasitism
Competition
Plover birds typically eat parasites trapped inside of crocodiles' mouths. The plover receives a meal, while the crocodile is rid of parasites. What type of ecological relationships does this scenario represent?
Mutualism
Predator/Prey
Competition
Commensalism
Lions typical fight to death for territory, mates, and food sources. Lions are most likely fighting due to:
Commensalism
Mutualism
Competition
Parasitism
Cordyceps are a type of a fungi that hijack insects muscular and nervous systems, eventually leading to the death of the insect. What type of relationship is this?
Commensalism
Predator/Prey
Parasitism
Competition
What is the difference between the biotic and abiotic factors?
Biotic factors are living things and abiotic factors are nonliving things.
Biotic factors are nonliving things and abiotic factors are living things.
Pesticides and herbicides eventually show up in higher-level consumers (i.e. as you go up the food chain) due to
biomagnification
climate change
habitat destruction
bioaccumulation
