Organism Roles
Food Chains
Energy Pyramids
Effects of Organisms
MISC.
100
What type of consumer only eats plants?
HERBIVORES
100
Put the organisms in the correct order to show how energy and matter move through the food chain.
SUN → ARCTIC WILDFLOWERS → LEMMING → HAWK
100
Each level in an ecosystem passes only a fraction of its available energy to the next level above. What fraction of the available energy is passed to the next level?
1/10 of the available energy
Organisms use 9/10 of their energy for their other life processes.
100
An _______________ is an introduced species that is better able to compete for resources than the existing species in the ecosystem.
INVASIVE
100
Describe the difference between living and nonliving things. Provide an example of both.
Living things need water, air, and food (energy) to survive while nonliving things do not. Living things can also grow, reproduce, move, etc.
200
A ____________ is a living thing that gets energy by breaking down dead organisms and animal wastes into simpler substances.
DECOMPOSER
200
Using the food chain, which organism has the biggest population in the ecosystem?
GRASS
As they have the most energy available, more of that species is able to survive.
200
What do all second and third level consumers have in common?
These consumers must eat animals! That means they must be carnivores or omnivores.
200
What can happen to a population when competitor population moves into its environment? For example, what could happen to a population of birds if another competitor population lives in their environment?
There would be more competition and the population would most likely DECLINE.
200
What’s type of organism is always on the bottom of an energy pyramid?
Producers are always on the bottom of the energy pyramid while consumers are on the second level and the third level.
300
A __________ is a type of animal that feeds on dead plants and animals.
SCAVENGER
300
At which level in the food chain is the least energy available?
At the end of the food chain! These animals only receive a fraction of the energy the previous animals receive in the food chain. For example, a wolf receives the least energy in the following food chain: sun → grass → deer → wolf
300
Starting from the bottom, name the organism that belongs in each level of the energy pyramid.
300
A disease has killed many trees in an ecosystem. What do you think will happen to the organisms in the area?
POSSIBLE ANSWERS: Animals that use the trees for food or shelter might die off or have to move to a new location.
300
Fungi and bacteria are examples of _________. They do the “cleanup work” in the ecosystem.
DECOMPOSERS
400
Why are decomposers important in ecosystems?
Their decomposition of dead animals eventually restores some materials back to the soil. These materials will be reused by other living organisms.
400
Which organism is the most plentiful (has the largest population) in this food chain?
GRASS: Grass has the most energy available at their trophic level. More of that kind of organism will be able to survive in that ecosystem.
400
How much energy will the hawk receive in this food chain if grass has 4,000 energy units?
4 energy units!
400
José was researching carrion beetles and he found the following information: Carrion beetles crawl inside dead animals and eat them. They lay their eggs near a dead animal so that the larvae can eat the dead animal after hatching. Using this evidence, pick the claim he should state for the report he is writing.
A. The carrion beetle is a scavenger.
B. The carrion beetle is a producer.
C. The carrion beetle is a decomposer.
D. The carrion beetle is an invasive species.
A) The carrion beetle is a scavenger.
400
Which organism is the least plentiful (has the smallest number of individuals in the ecosystem) in this food chain?
SNAKE: Snakes have a small amount of energy available to them so only a small amount of snakes will be able to survive in that ecosystem.
500
What is the difference between a producer and consumer?
An organism that makes its own food is called a producer and an organism that obtains energy and matter by feeding on other organisms is a consumer.
500
At which level in the food chain is the most energy available?
The level of producers! They receive energy directly from the sun. Consumers in the food chain only receive a fraction of their energy.
500
Are there more lemmings or arctic foxes in this ecosystem? Why?
MORE LEMMINGS: There is more energy available to lemmings than foxes, so more lemmings are able to survive than foxes.
500
Are all non-native species invasive?
No!
There are some non-native species that have been introduced into a new ecosystem without becoming invasive. Some organisms may not survive at all when brought to a new ecosystem.
500
What is one thing that would happen if the wolf population increased?
If the wolf population increased, they would eat more consumers.
The producer population would increase with less consumers.
The hawks would have to find food in new places or they would die out.