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Ecosystem Interactions

Total questions: 36

Worksheet time: 36mins

Name
Class
Date
1.
How many carnivores are shown in this food web?
a)
6
b)
4
c)
5
d)
3
2.
Which of the following is a herbivore?
a)
cricket
b)
frog
c)
hawk
d)
shrew
3.
Which of the following organisms in the food web is a producer?
a)
Giant Panda
b)
Snow Leopard
c)
Mushroom
d)
Bamboo
4.
Use the diagram to answer the question.
The Mayfly is a food source for which 3 organisms?
a)
Frog, Dragon Fly and snake
b)
Frog, trout and dragon fly
c)
Frog, salamander and trout
d)
Frog and phytoplankton
5.
In this food web, which two organisms could be harmed if the mouse population were to decrease?
a)
Deer and caterpillar
b)
Wolf and snake
c)
Oak and grass
d)
Hawk and songbird
6.
If the grasshopper were to be removed completely from the food web, what organism would be most effected?
a)
The squirrel
b)
The shrew
c)
The deer
d)
The rabbit
7.
Which organism do the owl and the weasel compete for in the food web?
a)
Hawk
b)
Spider
c)
Grasshopper
d)
Shrew
8.
What may happen if the snowshoe hare was removed from the food web pictured?
a)
The insects in the habitat would increase.
b)
The shrew population would decrease due to being only hawk food source.
c)
The willow tree population would decrease.
d)
Foxes would dies due to no food source. 
9.
A whale consumes krill, which is a tiny heterotroph that eats phytoplankton. Phytoplankton is an organism which utilizes photosynthesis to chemically alter sunlight, water, and carbon dioxide into glucose and oxygen. In this case, what is the whale classified as?
a)
Prey
b)
Predator
c)
Autotroph
d)
Producer
10.
Which two organisms in this food web are COMPETING for food with each other?
a)
Cougar and Deer
b)
Rabbit and Snake
c)
Insects and Grass
d)
Shrew and Mouse
11.
If the grasshopper were to be removed completely from the food web, what organism would be most effected?
a)
The squirrel
b)
The shrew
c)
The deer
d)
The rabbit
12.

Which of the following is an example of an abiotic factor affecting a biotic factor?

a)

The wolf population increases due to an increase in the deer population

b)

The sea lion population decreases due to a lack of food

c)

The temperature in a region increases due to an increase in sunlight

d)

An extreme drought causes the population of grass to decrease

13.

When the hare population increased, what happened to the lynx population?

a)

It also increased

b)

It decreased

c)

It stayed the same.

14.
A desert food web is shown in the diagram. Which of the following represents a producer/consumer relationship that is illustrated in the diagram?
a)
Fire ants get energy from plants.  
b)
Hawks get energy from kangaroo rats.
c)
Rattlesnakes get energy from spiny lizards.
d)
Scorpions get energy from fire ants.
15.
The strangler fig is a vine that starts out as a seed in the tree canopy of the rainforest. It drops its roots down from the canopy to the forest floor. By sprouting in the rainforest canopy, the strangler fig seedling is exposed to more —
a)
sunlight.
b)
soil. 
c)
nutrients.
d)
consumers.
16.
The Prairies Region and the Cross Timbers are located in north-central Texas. The graph below shows information about eating habits of white-tailed deer in these regions.  A Cross Timbers rancher is concerned about competition between the ranch animals and the deer. Based on the graph, which ranch animals compete for the most food with white-tailed deer?
a)
Cattle that eat grass and feed.
b)
Goats that eat weeds and shrubs.
c)
Turkeys that eat seeds and fruit.
d)
Hogs that eat fruit, seeds, and feed
17.
A park is home to a large number of robins, squirrels and rabbits. The robins and squirrels live in the park’s trees. The robins feed on earthworms and insects that live on the ground. The squirrels eat the acorns produced by the park’s oak trees. The rabbits hide in the bushes and feed on the grass. Which factor would negatively impact the number of rabbits living in the park?
a)
Collecting acorns off the ground.
b)
Planting more trees.
c)
Removing park bushes.
d)
Removing the squirrels.
18.
(8.11B) The Couch's spadefoot lives in Texas and his the characteristics listed below.
The Couch's spadefoot is adapted to a certain type of environment. Which of these resources is most likely scarce in this environment?
a)
Soil
b)
Sunlight
c)
Water
d)
Oxygen
19.

An earthworm farmer wanted to grow three species of earthworms, but earthworms can be very picky about the temperature, moisture, and pH balance of their soil. This graph shows the range of soil conditions preferred by three species of earthworms in an earthworm soil bed.

Which of these conditions would cause the most competition for the resources among the three species of earthworms?

a)

Very warm soil, ph of 6, and dry.

b)

Very cold soil, pH of 7, and high moisture.

c)

Moderate temperature, pH of 6.5, and moderate moisture.

d)

Moderate temperature, pH of 7.0, and high moisture.

20.
Bromeliads are small plants that grow attached to the sides of large trees high above the ground in warm, damp and densely crowded tropical rainforests. Bromeliads do this because they are in competition with other plants for -
a)
soil.
b)
heat.
c)
light.
d)
water.
21.
Coral reefs are important to many ocean ecosystems because they provide food & shelter for numerous marine organisms.  Climate changes that lead to increased water temperatures can slow the growth of coral.  Scientists monitor the physical conditions & species distribution of coral reefs & try to temporarily alter conditions when they are harmful to coral reefs.  Which of these actions would BEST accomplish the goal of preserving coral reefs?
a)
restrict regulations concerning reefs
b)
isolate predators from reef inhabitants
c)
protect the biodiversity of coral reefs
d)
identify new species associated with reefs
22.
The oak savanna ecosystem is dependent on wildfires & controlled burnings to manage the growth of invasive & nonnative shrubs and trees and to help maintain the native semi-open ecosystem.  Which statement BEST describes the impact invasive plant species could have if not maintained by fires?
a)
they could decrease the populations of native species
b)
they could decrease the amount of O2 available for the native animals
c)
they could increase the amount of food available to native plants & animals
d)
they could increase the amount of N in the soil that is toxic to the native plants
23.
To reduce erosion in an area, an exotic fast-growing vine is introduced into the area without any growth control.  How will the new plant most likely have an effect on the ecosystem?
a)
The vine will provide protection for the native plants
b)
The vine will provide more CO2 to all of the other species
c)
The vine will compete with native plants for resources
d)
The vine will compete with native animals for food, water, and minerals
24.
In Southern California, the intentional reduction of the coyote population has led to a decrease in the types of song birds in that area.  Which is a likely explanation why song bird populations have decreased?
a)
Coyotes feed on animals that prey on song birds.
b)
Coyotes protect nests built by bird songs.
c)
Song birds are killed by diseases carried by coyotes.
d)
Song birds feed on animal matter killed by coyotes.
25.
Eutrophication can occur when a lake or pond acquires a high concentration of nutrients such as phosphates & nitrates.  Often this increase in nutrients is due to run-off during rain storms.  How can eutrophication affect the life of organisms in one of these environments?
a)
Aquatic plants decrease from the addition of fertilizers.
b)
Aquatic animals increase in # due to the food supply being increased.
c)
Bottom-dwelling plants & animals decrease in # from an increase in algae & O2.
d)
Plant & animal biodiversity decreases from increased levels of organic matter & decomposing organisms
26.

Which of the following would be a logical effect on the ecosystem if the deer population doubles within a short period of time?

a)

The plant population will decrease rapidly and then the rodent population will decrease.

b)

The number of trees will increase rapidly as deer begin to eat the insects that consume trees.

c)

The population of insects that feed on ferns will increase rapidly and then drop off rapidly.

d)

The number of wolves in the forest will decrease due to competition with deer for resources.

27.

Based on the information in the food web, which organism would be least affected by overfishing for cod in the Arctic waters?

a)

Baleen Whales

b)

Toothed Whales

c)

Shrimp

d)

Seals

28.

What event within the food chain might lead to the graph shown below?

a)

A disease in the population of rabbits.

b)

A disease in the population of snakes.

c)

A disease in the population of hawks.

d)

It is impossible to tell which of the above occurred.

29.

If a disease strikes the snake population in the food chain shown, what will be the initial effect on the populations of hawks and rabbits?

a)

The populations of hawks and rabbits will decrease.

b)

The populations of hawks and rabbits will increase.

c)

The population of hawks will increase. The population of rabbits will decrease.

d)

The population of hawks will decrease. The population of rabbits will increase.

30.

What most likely caused the rabbit population to decrease over the first time unit shown in the following graph? Pay close attention to the (y) axis | and what it is telling you.

a)

A disease in the population of rabbits

b)

A decreasing population of grasses.

c)

An increasing population of hawks.

d)

A higher than normal population of snakes.

31.

Trapping has severely reduced the population of rabbits in an ecosystem, as shown in the bar graph below. What is the most likely effect this will have on other organisms?

a)

The hawk population will increase rapidly and the rabbit population will decrease rapidly.

b)

The snake population will decrease rapidly and the grass population will increase rapidly.

c)

The grass population will decrease rapidly and the snake population will increase rapidly.

d)

The grass, rabbit, snake, and hawk populations will all decrease rapidly.

32.
This diagram shows the variety of organisms that live in different tide zones. Mussels are common organisms that compete for space in intertidal (middle) tide zones. If all of the mussels were removed from zone A, which organisms would likely compete for the space in Zone A?
a)
Periwinkle and Limpets
b)
Sea lettuce and Chiton
c)
Sea urchins and Hermit crabs
d)
Rock louse and Periwinkle
33.
       Eucalyptus trees compete strongly with native trees for limited water and soil nutrient resources. They prevent native seedlings from becoming established by shading the soil surface, accumulating deep litter layers, and changing the pH balance of the soil. This graph shows the results of an ecosystem that has changed overtime due to the introduction of the non-native species of Eucalyptus trees.  Which of the following statements correctly describes the relationship between species A and species B?                          
a)
Eucalyptus trees win in competition and Native trees go extinct.
b)
Native trees win in competition and Eucalyptus trees go extinct.
c)
The population of both trees decreases over time.
d)
Eucalyptus trees do not compete with each other.
34.
     The Black-banded Sea Krait is found in the warm waters of the Pacific Ocean. It is well adapted to the environment in which it lives.          Which of these resources is most likely limited in the Black-Banded Sea Krait's environment?
a)
Land
b)
Coral dwelling fish
c)
Water
d)
Coral
35.

This graph demonstrates--

a)

there is no relationship between predator and prey populations.

b)

changes in the predator population depend on changes in the prey population.

c)

Predator and prey populations are constantly increasing.

d)

changes in the prey population depend on changes in the predator population.

36.

Organism X feeds mainly on small fish, amphibians, and reptiles. With which organism is organism X most likely to compete?

a)

Great blue heron

b)

Mallard

c)

Pied-billed grebe

d)

Great egret

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