
Biology Keystone Unit 8
Authored by Nicholas Eidle
Biology
9th Grade
NGSS covered
Used 35+ times

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21 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which sequence best orders ecological categories from the one with the fewest number of individuals to the one with the greatest number of individuals?
ecosystem, population, community, biome
population, community, ecosystem, biome
biome, population, community, ecosystem
community, biome, population, ecosystem
Answer explanation
Populations of different species interact in communities,
communities of organisms interact with abiotic factors in an ecosystem, and similar ecosystems in a large area make up a biome.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Energy pyramids describe food and energy relationships within an ecosystem. Which factor most likely limits the number of levels an energy pyramid can have?
biomass of the top-level organisms
predation by the top-level organisms
energy loss between each level of organisms
chemical energy being decomposed at each level of organisms
Answer explanation
The number of levels in an energy pyramid is limited by the amount of energy available for the next level of consumers.
Tags
NGSS.MS-LS2-3
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Orchids living in tropical rainforests often grow on the branches of trees to access sunlight. The trees are not affected by the orchids. Which term best classifies the relationship between the orchids and the trees?
predation
parasitism
competition
commensalism
Answer explanation
The orchids benefit from the trees without harming them.
Tags
NGSS.MS-LS2-2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student listed characteristics of a classroom aquarium ecosystem. Which characteristic is a biotic component of the aquarium ecosystem?
The water temperature is 23°C.
The pH of the water is usually between 6.5 and 6.8.
The ammonia is controlled with a filter that uses two types of bacteria.
The lighting is supplied by natural sunlight and a fluorescent light bulb.
Answer explanation
The bacteria in the filter are a biotic component of the
ecosystem.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tadpoles grown in ponds with high densities of tadpoles have lower survival and growth rates than tadpoles grown in ponds with lower densities of tadpoles. Which interaction between tadpoles grown in high-tadpole-density ponds would most likely cause the decreased survival and growth rates?
symbiosis
mutualism
competition
commensalism
Answer explanation
Tadpoles in low-density ponds have less competition for resources.
Tags
NGSS.MS-LS2-1
NGSS.MS-LS2-4
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which population description is most likely represented by the graph?
A population of birds quickly increases but then becomes stable due to limiting factors in
the environment.
A population of mice slowly increases but then fluctuates seasonally as predators raise their
young and limit prey populations.
A population of fish quickly increases in the spring when there is plenty of food but then
decreases quickly in the fall when food is limited.
A population of wolves slowly increases because of limiting factors in the environment but
then increases constantly when additional prey migrate into the environment.
Answer explanation
The trend line on the graph shows that the population increases slowly at first, then rapidly increases, and then levels off.
Tags
NGSS.MS-LS2-1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Asian carp are an invasive species of fish. These large fish eat up to 40% of their body weight per day by feeding on phytoplankton. The carp also reproduce quickly. If these fish were to enter Lake Erie, how would the Presque Isle coastal ecosystem most likely be affected?
Producers in the ecosystem would grow at a faster rate, and smaller fish such as yellow
perch would thrive.
The invasive fish would prey on mollusks such as mussels, but native fish species would
quickly eat the invasive fish.
Consumers in the higher trophic levels would suffer stress, but crustaceans such as amphipods would be unaffected.
Most consumers in the ecosystem would face a shortage of food, and larger fish, such as walleye, would be unable to thrive.
Answer explanation
Asian carp would reduce the amount of phytoplankton available to primary consumers, causing secondary and tertiary consumers to
have fewer available food resources.
Tags
NGSS.MS-LS2-1
NGSS.MS-LS2-3
NGSS.MS-LS2-4
NGSS.MS-LS2-2
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