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

100

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

100

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

100

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

100

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

100

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

200

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

200

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

200

limit
Predators ____________________ the size of prey populations.

200

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

200

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

300

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

300

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

300

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

300

gets smaller
When deaths exceed births, the population __________.

300

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

400

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

400

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

400

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

400

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

400

This type of bat ate mosquitoes.
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?

500

increase
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 __________.

500

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

500

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

500

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

500

The other herbivore populations are reduced.
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?

Food Chains and Food Webs

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