WorksheetsBiology 4.2 - What Shapes an Ecosystem
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
What causes solar radiation to strike different parts of Earth's surface at an angle that varies throughout the year?
a)
Earth's tilted axis
b)
Earth's erratic orbit
c)
The moon's orbit around the Earth
d)
Solar flares on the sun's surface
2.
In which location is the sun almost directly overhead at noon all year?
a)
The Equator
b)
The South Pole
c)
The North Pole
d)
China
3.
All the biotic and abiotic factors in a pond form a(an)
a)
biosphere
b)
ecosystem
c)
community
d)
niche
4.
A relationship in which one organism is helped and another organism is neither helped nor hurt is called
a)
mutualism
b)
parasitism
c)
competition
d)
commensalism
5.
A form of symbiosis in which both organisms benefit is called
a)
mutualism
b)
parasitism
c)
competition
d)
commensalism
6.
A type of symbiosis in which one organism benefits and the other is harmed is called
a)
mutualism
b)
parasitism
c)
commensalism
d)
predation
7.
Natural disturbances, such as fires or hurricanes, can result in
a)
commensalism
b)
competition
c)
parasitism
d)
ecological succession
8.
Which is NOT an abiotic factor in an ecosystem?
a)
microorganism
b)
light
c)
temperature
d)
rainfall
9.
What defines a species' niche?
I. Abiotic factors
II. Biotic factors
III. Food web
I. Abiotic factors
II. Biotic factors
III. Food web
a)
I. only
b)
III. only
c)
I. and II. only
d)
I. and II. and III.
10.
The disappearance of a population in a given niche as a result of direct competition with another species for a resource is called
a)
competitive exclusion
b)
predation
c)
parasitism
d)
mutualism
11.
A keystone species is one that
a)
eats a mixture of plants and animals.
b)
is introduced into a community after a major disturbance.
c)
causes the amount of diversity in a community to decrease.
d)
helps to stabilize the populations of other species in a community.
12.
After a natural disaster occurs in a healthy ecosystem, secondary succession will cause the ecosystem to return to its original ________________________.
a)
climax community.
b)
valley community.
c)
habitat.
d)
pioneering species.
13.
What is a climax community?
a)
A stable group of plants and animals that is the end result of a succession process.
b)
The original group of plants and animals that is the end result of a succession process.
c)
An extreme group of plants and animals that is the end result of a succession process.
d)
A weaker group of plants and animals that is the end result of a succession process.
14.
The clearing of a rain forest an example of a(an) ______________________________ drastic enough to prevent the original climax community from reforming.
a)
human-caused distrubance
b)
natural disaster
15.
During primary succession, chance plays a large role in determining which pioneer species arrives in an area first.
a)
True
b)
False
16.
Ecological succession is
a)
a series of predictable changes that occur in a community over time.
b)
succession that occurs on surfaces where no soil exists.
c)
a disturbance that changes a community without removing the soil.
d)
a process by which one monarch succeeds another.
17.
Primary succession is
a)
a series of predictable changes that occur in a community over time.
b)
succession that occurs on surfaces where no soil exists.
c)
a disturbance that changes a community without removing the soil.
d)
a process by which one monarch succeeds another.
18.
Secondary succession follows
a)
a series of predictable changes that occur in a community over time.
b)
succession that occurs on surfaces where no soil exists.
c)
a disturbance that changes a community without removing the soil.
d)
a process by which one monarch succeeds another.
19.
Secondary succession typically proceeds faster than primary succession because what is already in place?
a)
soil
b)
water
c)
sunlight
d)
species
20.
Choose the correct order of succession using the diagram.
a)
A⊳B⊳C⊳D
b)
A⊳D⊳B⊳C
c)
A⊳C⊳D⊳B
d)
A⊳B⊳D⊳C
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