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WorksheetsEcosystem Unit Review
Total questions: 15
Worksheet time: 30mins
In an ecosystem, grasshoppers are the main food source for opossums. The opossums are hunted by great horned owls and gray foxes. The population of opossums is reduced due to the spread of a disease.What effect will the decrease in the opossum population have on other organisms of the ecosystem?
The gray fox population will increase.
The grasshopper population will increase.
The grass cover in the region will increase.
The great horned owl population will increase.
Use the diagram which shows a simple grassland food web to answer the question. Which statement about the food web is true?
Snakes feed on mice and lizards for food.
Hawks feed on mice and snakes for food.
Mice feed on grasses and lizards for food.
Lizards feed on grasshoppers and rabbits for food.
A forest food web is shown in the diagram. Which statement describes what will happen if all the rabbits and squirrels die due to the spread of a disease?
The population of owls will increase since the owls will feed on snakes only.
The population of deer will decrease gradually because grass will dry out.
The population of foxes will decrease because the foxes will not get enough food.
The population of blueberries will increase because deer will stop feeding on them.
The diagram shows a food web of Chesapeake Bay. Which statement correctly explains the immediate effect of removing large fish from the ecosystem?
There would be a sudden increase in the population of small fish.
There would be a sudden increase in the population of sea ducks.
There would be a sudden decrease in the population of bald eagles.
There would be a sudden decrease in the population of ospreys.
A student made a table to categorize different organisms of a wetland food chain. Which organisms depend on the bladderwort for food?
grass carp and mosquito
alligator and heron
heron and grass carp
mosquito and alligator
Termites are organisms that break down dead and decaying wood matter. Which term best describes the role of termites in a food chain?
carnivore
consumer
decomposer
producer
The list shows how different organisms in a pond habitat obtain energy. Which food chain correctly represents the energy flow in the pond habitat?
snail → catfish → heron → algae
heron → catfish → snail → algae
catfish → snail → algae → heron
algae → snail → catfish → heron
Sharks must eat fish to survive in an ocean ecosystem. What role of the shark is described?
Consumer
decomposer
prey
producer
Which statement best explains how the role of an organism in a food chain is described?
The role of an organism in a food chain is described by the organism’s size.
The role of an organism in a food chain is described by the way it gets its energy.
The role of an organism in a food chain is described by the organism’s lifespan.
The role of an organism in a food chain is described by the speed of the organism.
What is the primary source of energy in most living communities?
animal
plant
snail
sun
A student lists characteristics of two types of aquatic ecosystems. Which characteristics are unique to pond and lake ecosystems?
1 and 3: pond ecosystems; 2 and 4: lake ecosystems
1 and 3: lake ecosystems; 2 and 4: pond ecosystems
2 and 3: lake ecosystems; 1 and 4: pond ecosystems
2 and 3: pond ecosystems; 1 and 4: lake ecosystems
Which statement is true about an ocean ecosystem?
Most organisms in an ocean ecosystem live in-between the coastline and the continental shelf.
The temperature of the ocean water remains the same from the top to the bottom.
The salinity of the ocean changes with the tides.
An ocean is a body of freshwater surrounded by land.
A student classified some bodies of water into two groups. What was the basis of the student’s classification?
area covered by the body of water
amount of rainfall received by the body of water
amount of sunlight received by the body of water
type of water in the body of water
Imagine that the rainforest had received less rainfall than usual, what would be affected by this change first ?
carnivores
herbivores
producers
consumers
Analyze the bar graphs. How does the amount of rainfall influence the plants in the ecosystem?
As less rain falls, more plants grow.
The plant population stays the same regardless of rainfall.
As more rain falls, less plants grow.
As more rain falls, more plants grow.
