Answers2026-27 AL-Earth and Space ScienceStructure and Composition of the Atmosphere

Week 7 Test Answers

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1
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Which of the following best explains why ecosystems need a continual influx of new energy?

A
Photosynthesis feeds herbivores, carnivores, and decomposers.
B
As energy is recycled, a small amount is lost as heat.
C
Energy flows through an ecosystem and cannot be recycled.
D
Cellular respiration does not feed back into other processes.
2
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Which of the following is true about the efficiency of energy transfer in an ecosystem?

A
The more energy the organism requires, the more efficient the energy transfer.
B
All energy transfers have the same efficiencies.
C
The less energy the organism requires, the more efficient the energy transfer.
D
The most efficient energy transfers are in large, warm-blooded animals.
3

Which atmospheric layer is where Earth's northern and southern lights occur?

A
mesosphere
B
stratosphere
C
thermosphere
D
troposphere
4

Which statement best describes monsoons?

A
They force cool, moist air from oceans to rise.
B
They are winds that blow in the opposite direction of a normal wind.
C
They bring heavy rain in the winter and in the summer.
D
They influence precipitation as wind moves near a mountain.
5

What must happen for most areas on Earth to experience all four seasons?

A
The Sun must reach its highest point in the sky.
B
The Northern Hemisphere must experience winter.
C
The axis must be tilted at a certain angle that remains unchanged.
D
The north end of Earth’s axis must always point away from the Sun.
6

How does altitude affect climate patterns in a region?

A
Areas at high elevations have cooler temperatures.
B
Air continues to warm as it rises to a higher elevation.
C
Tropical regions do not have many differences in altitude.
D
High-altitude areas have less variation in seasonal temperatures.
7

In December, a city in the Southern Hemisphere has warm weather all month long.What causes this to happen?

A
The city experiences fewer hours of daylight.
B
The city is experiencing a winter solstice.
C
There is a high concentration of the Sun’s rays in that region.
D
The Sun reaches its highest point in the sky during this month.
8

Which of the following is not true about energy in ecosystems?

A
Energy is transferred between organisms.
B
Energy is recycled after flowing through ecosystems.
C
Most energy enters ecosystems as sunlight.
D
Ecosystems require a continuous influx of new energy.
9

Which correctly list the three gases that each make up less than 1 percent of Earth’s atmosphere?

A
argon, water vapor, carbon dioxide
B
oxygen, argon, water vapor
C
nitrogen, oxygen, carbon dioxide
D
carbon dioxide, oxygen, argon
10

Which of the following is not a direct fate of the energy flowing through photosynthesis?

A
carnivores
B
cellular respiration
C
herbivores
D
heat sinks
11

Explain why cold-blooded organisms like reptiles have a higher rate of secondary productivity than warm-blooded mammals.

Answer not available
12

Ecosystem productivity is principally limited by _______.

A
sunlight and nutrient availability
B
water and nutrient availability
C
the availability of time and nutrients
D
none of the above
13

Explain why energy in most ecosystems must flow from the sun, then to autotrophs and finally to heterotrophs, in that order.

Answer not available
14

Explain how waste heat is inevitable in ecosystems.

Answer not available
15

Which phrase defines altitude?

A
how tightly molecules are packed
B
a column of air pushing on an area
C
the force pushing on an area or a surface
D
the height of a given point above sea level

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