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WorksheetsEcosystems and Biodiversity
Total questions: 12
Worksheet time: 3600secs
Name
Class
Date
1.
When is an ecosystem best able to support a variety of organisms?
a)
When organisms share food and habitats equally
b)
When competition for food is controlled by humans
c)
When organisms have different roles/niches in the ecosystem
d)
When there are not enough producers to support the ecosystem
2.
Many more species of plants and animals live in a tropical forest than live in a desert. This difference is most likely due to the fact that, compared to a tropical forest, a desert (what is different about a desert?)
a)
has less available sunlight
b)
contains soil with sand
c)
contains less water
d)
has more carbon dioxide in the atmosphere
3.
Which of the following would be the best reason why microhabitats are best able to support a variety of organisms?
a)
Microhabitats always have the same biotic and abiotic factors as the surrounding habitat
b)
Microhabitats vary in abiotic factors such as wind, air, light, soil and heat
c)
All microhabitats have similar biotic and abiotic factors
d)
Microhabitats are always found in the most unusual spots
4.
The presence of permafrost (frozen soil) makes little water available in the tundra (very cold) biome. Biodiversity in this ecosystem
a)
Is limited to plants that grow low to the ground and require very little water
b)
Is limited to animals that burrow in the snow
c)
Is limited to tall cone shaped trees that allow snow to roll off
d)
Is limited to trees that lose their leaves in the winter to conserve water
5.
In the diagram below, how would spraying pesticides (used for destroying insects) to remove all the mosquitoes affect this food web?
a)
Mosquitoes are not an important species, and would not affect the food web
b)
Removing mosquitoes would cause the entire food web to be affected
c)
All the insects that compete with mosquitoes would also die
d)
Removing the mosquito would not affect the top level consumer
6.
Wolves provide a year round supply of decomposing matter for scavengers to feed on. This is an example of
a)
A wolf’s niche helping the sustainability of an ecosystem
b)
A wolf’s niche limiting the sustainability of an ecosystem
c)
A wolf’s niche harming a scavenger’s niche
d)
A wolf’s niche not affecting the sustainability of the ecosystem
7.
Look at the picture above. In which biome would this sequence of plant communities most likely be found?
a)
desert
b)
tundra
c)
tropical rain forest
d)
temperate deciduous forest
8.
Which of the following is an example of biodiversity (variety of life in the world) supporting the sustainability of an ecosystem?
a)
A disease is introduced into an ecosystem and wipes out a native grass species, but grasses of other species are not affected by the disease
b)
Overcrowding of an ecosystem due to urban development causes a decrease in its populations
c)
Overcrowding of an ecosystem due to urban development causes a decrease in its populations
d)
An increase in the mouse population causes an increase in other herbivore populations already present in an area
9.
Compare the two ecosystems shown in the diagrams above. How does the biodiversity of these two ecosystems affect their sustainability?
a)
Ecosystem B is more sustainable because it is less complex of a food web
b)
Ecosystem B is more sustainable because more organisms can fulfill the same niche
c)
Ecosystem A is more sustainable because it is more likely to survive a drought
d)
Ecosystem A is more sustainable because there are more top predators
10.
If all of the frogs in the two ecosystems died due to a virus how would this affect the ecosystems shown in the diagrams above?
a)
The top level consumers in both ecosystems would die due to lack of food
b)
The grasshopper population would increase in both ecosystems
c)
The populations of 1st level consumers in ecosystem A would decrease
d)
The population of grass in ecosystem B would increase
11.
If all of the grasshoppers in both ecosystems died due to a fungus how would this affect the ecosystems shown in the diagrams above?
a)
The top level consumers in both ecosystems would die
b)
The second level consumers in ecosystem A would survive
c)
The third level consumers in both ecosystems would survive
d)
Most of the consumers in ecosystem B would survive
12.
The rainforest has an extremely high number of plants and animal species because ______.
a)
It receives heavy rainfall and has cold temperatures
b)
It receives heavy rainfall and has warm temperatures
c)
It receives very little rainfall and lots of chemical energy
d)
It receives very little rainfall and lots of radiant energy
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