
Biology SB5
Authored by Charles Martinez
Science
9th Grade
NGSS covered

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21 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The picture below shows a mimosa leaf before and after it was pinched.
It is moving away from the pull of gravity.
It is moving away from touch.
It is moving toward touch.
It is moving toward light.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Food Availability, Places to live, and water availability are all ______ of an Ecosystem.
Biotic factors
Heterotrophic factors
limiting Factors
Population factors
Tags
NGSS.MS-LS2-4
NGSS.MS-LS2-1
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The image shown is of a kelp bed. In ideal conditions, kelp can grow up to 18 inches per
day. In stark contrast to the slow-growing corals, the giant kelp canopies tower above the
ocean floor. Like trees in a forest, these giant algae provide food and shelter for thousands
of fish, invertebrates, and marine mammal species. Storms and weather events, like El
Niño, can tear and dislodge the kelp, leaving a tattered forest to begin its growth again
each spring. Sea otters and sea urchins play critical roles in the stable equilibrium of this
ecosystem. Sea urchins graze kelp and may reach population densities large enough to
destroy kelp forests at the rate of 30 feet per month. Urchins move in herds, and enough
urchins may remain in the location of a former kelp forest to stop any regrowth.
In the scenario above, identify the keystone and foundation species. Infer what might
happen if the keystone species were greatly reduced.
Keystone species is the kelp. If the kelp is reduced or destroyed the basis for the entire
ecosystem is destroyed as is the ecosystem.
Keystone species is the kelp. It is the foundation for this ecosystem. If destroyed it would
be replaced by another producer to establish a different ecosystem.
Keystone species is the sea otter. Sea otters, playing a critical role in containing the
urchin populations, prey on urchins and thus control the numbers of kelp grazers to
maintain the forest.
Keystone species is the sea urchin. If the sea urchin species is greatly reduced by an
increase in the sea otter population, the kelp beds would continue to grow unchecked and
other populations of herbivores would grow.
Tags
NGSS.MS-LS2-4
NGSS.MS-LS2-1
NGSS.MS-LS2-3
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The population of mice in a local forest ecosystem has recently died out due to disease. In
the past, these mice were the main predators of the forest beetles.
What is the best prediction about what will happen to the beetles?
The drop in the mouse population will lead to a drop in the beetle population.
The drop in the mouse population will lead to no change in the beetle population.
The drop in the mouse population will lead to an increase in the beetle population.
The increase in the mouse population will lead to an increase in the beetle population.
Tags
NGSS.MS-LS2-4
NGSS.MS-LS2-1
NGSS.MS-LS2-2
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
When the members of a population reproduce at a constant rate and overshoot the
carrying capacity of their environment, it is called _______________ growth.
logistic
demographic
exponential
density dependent
Tags
NGSS.HS-LS2-1
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
In an ecosystem, which is NOT a density-dependent limiting factor?
predation
parasitism
competition
natural disaster
Tags
NGSS.MS-LS2-4
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Choose the letter than correctly answers the question.
Which of the these is shown from the smallest to the largest?
organism, population, community, ecosystem, biosphere
biosphere, ecosystem, community, population, organism
population, ecosystem, community, organism, biosphere
community, ecosystem, biosphere, population, organism
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