Science Unit 4 Review - Food Webs & Energy

Diagram Card #1

100

#1:

What would happen to the population of grasshoppers if the frogs all got sick and were killed by a disease?

The population would increase; there would be a lot of grasshoppers.

200

#1

Which organism is a primary consumer?

Grasshopper

300

#1

What is the original source of energy in this food chain?

the sun

400

#1

Which organism is the top predators in this food chain?

Hawk - because it doesnt have any predators in this food chain.

Diagram Card #2

100

#2

What cause more changes in the whole food web - the removal of the hawk OR the removal of the grass and trees?

Grass and trees - because they are at the bottom and support all of the other organisms.

200

#2

Which 3 organisms are secondary consumers?

Bird, fox, snake

300

#2

What are the 2 predators of the squirrel?

fox and snake

400

#2

Which organism is an omnivore? 

bird

Diagram Card #3

100

#3

Which organism has the most predators?

Anchovy

200

#3

Is this an example of a food chain or a food web?

Food web - it shows several food chains interacting

300

#3

What would happen to the population of seagulls if the population of lobsters decreased (went down)?

The population of seagulls would decrease (go down) also because there would be less food available and some might starve.

400

#3

How many different food chains is the lobster a part of?

FOUR

1 - algae, anchovy, lobster, seagull

2 - algae, anchovy, lobster ,seal, shark

3 - algae, lobster, seagull

4 - algae, lobster, seal, shark

Diagram Card #4

100

#4

Which organism is the top predator in this food chain?

shark

200

#4

Is this an example of a food chain or a food web?

Food chain

300

#4

Why does the arrow point from the seal to the shark?

Because energy moves TO the shark

OR

The shark eats the seal

400

#4

What would happen to the population of seals if the cod were all removed?

Seals would decrease because they would have less food.

Misc

100

What is the name of the process that PRODUCERS use to make energy from the sun?

Photosynthesis

200

True or false:

A change at one level of an ecosystem AFFECTS organisms at the next level up on a food web.

True.

300

What is a name of a model that shows that only 10% of energy moves up from one part of a food web to the next?

e____________  p______________

energy pyramid

400

Why are there usually less top predators than herbivores in an ecosystem?

There is less energy available to support them; not as much energy makes it to the top of the food web.