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WorksheetsInterdependence
Total questions: 14
Worksheet time: 18mins
Name
Class
Date
1.
What would best explain the decrease in primary producers?
a)
an increase in solar energy
b)
a decrease in O2 levels in the H2O
c)
a decrease in the population of tertiary consumers
d)
an increase in the population of primary consumers
2.
What would likely be the result if a pesticide is used to reduce the # of harvester ants?
a)
an increase in snakes & a decrease in hawks
b)
a decrease in snakes & an increase in hawks
c)
a decrease in mesquite bushes & an icnrease in horned lizards
d)
an increase in mesquite bushes & a decrease in horned lizards
3.
Pond ecosystems require N, P, and K in order to support the growth of algae. This increase in algal growth can cause an increase in decaying matter in the pond. What LONG-TERM effect might an increase in algal growth have on a pond ecosystem?
a)
a decrease in the amount of available O2 necessary for fish in the ecosystem
b)
an increase of the fish population in the pond
c)
a population increase in other producers, such as water lilies, in the ecosystem
d)
an increase in available food for the fish in the ecosystem
4.
Human-built dams across rivers have both positive & negative effects on the environment. What effect does building dams have on environments downstream?
a)
a positive effect due to increasing the natural flow of nutrients
b)
a negative effect due to reducing populations of non-native species
c)
a negative effect due to increasing the populations of native species
d)
a negative effect due to decreasing the natural flow of nutrients
5.
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
6.
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
7.
Which factor is responsible for beginning the process of change in the ecosystem from diagram 1 to 4?
a)
climate change in the area
b)
breakdown of rock for more P in the area
c)
organic matter from producers
d)
action of roots by large trees in the area
8.
Which of these factors is most important for reestablishing plants & trees on an abandoned farm?
a)
sunlight & CO2
b)
O2 and CO2
c)
glucose & N
d)
ATP and xylem
9.
A decrease in the frog population would MOST likely lead to an increase in the population of which organisms?
a)
owl
b)
grass
c)
snake
d)
grasshopper
10.
How would a drought in the Southern Plains most likely affect the quail population?
a)
an increase in the quail population due to a decrease in the rabbit population
b)
a decrease in the quail population due to a decrease in nesting cover
c)
an increse in the quail population due to a decrese in the mouse population
d)
all of these
11.
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
12.
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.
13.
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
14.
A farmer plows a field of grass to plant crops. Which population of animals will MOST likely be impacted the greatest from the habitat change?
a)
deer that feed on field plants
b)
birds that nest in forest trees
c)
moles that burrow in shallow soil
d)
insects whose larva feed on dead animals
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