Webs and Chains
What's for Dinner?
What's Your Role?
Ecosystems and Their "Limits"
Tell me the Situation

100

A food chain shows the path that __________________ follow in an ecosystem.
energy and nutrients

100

An animal that only eats other animals is called a ____________.
Carnivore

100

Both predators and prey are ________________ because they must eat other organisms to get energy.
Consumers

100

What is an ecosystem made up of?
all the living and nonliving things in an environment, including their interactions with each other

100

22. Which organism is missing from the food chain below? Sun--> ? --> grasshopper --> mouse --> snake
Grass (or some type of plant)

200

What do the arrows of a food chain represent?
The arrows represent the energy flow from one organism to another.

200

An animal that only eats plants is called a ___________.
Herbivore

200

Predators ____________________ the size of prey populations.
limit

200

A ______________ includes all members of a single species in an area at a given time.
Population

200

In the following food chain which organism would be considered a tertiary consumer? Sun--> kelp (or seaweed) --> mussel --> crab --> sea otter
sea otter

300

Can an organism be part of more than one food chain?
yes, because it may be prey for more than one organism

300

An animal that eats both plants and other animals is called a ______________.
Omnivore

300

Herbivores are known as _______________ because they are the first consumers in a food chain.
primary consumers

300

When deaths exceed births, the population __________.
gets smaller

300

In the following food chain which organism would be considered a producer? Sun--> algae --> stone fly --> sunfish --> heron
algae

400

When one population in a food web changes, all the other populations in the food web can be ____________.
affected

400

Living things depend on _____________________ for survival.
their environment and each other

400

How are decomposers and consumers similar?
They cannot make their own food

400

What is a limiting factor?
Anything that controls the growth or survival of a population

400

A town used pesticides to control mosquitoes in the area. Scientists later observed that the population of one type of bat had decreased. Which is the BEST conclusion you can draw from this information?
This type of bat ate mosquitoes.

500

Many things can change or affect a food web. For example, if bobcats are removed from a forest food web, the populations of birds, mice, and raccoons would __________.
increase

500

As a population grows, competition for living space, food, and other resources increases. Eventually, increased competition leads to _________________________.
the death rate and birth rate being equal

500

Give three examples of a decomposer?
termites, fungi, bacteria, some types of worms

500

What two things determine the carrying capacity?
biotic and abiotic factors

500

The nutria was introduced to the United States by people who were breeding them for their pelts. Unfortunately, in the 1940’s many were released into the Louisiana’s swamps due to flooding caused by a hurricane. Because nutria are from South America, they have no natural predators here in the United States. What effect do nutria have on the other herbivore populations in the same ecosystem?
The other herbivore populations are reduced.