AnswersEnvironmental Science 2025-2026Global Connection: Recycling on Earth

Topic Test Answers

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3

Which of the following statements is true?

A
The nitrogen cycle is the most important cycle for life.
B
The oxygen cycle is the least important cycle for life.
C
Life can be sustained without any of the cycles for life present.
D
All cycles of matter are equally important for life to be sustained.
5

Which of the following is not a way in which carbon gases are introduced into the atmosphere?

A
forest fires
B
respiration
C
photosynthesis
D
burning of fossil fuels
6

Which of the following does not take place in the water cycle?

A
precipitation
B
evaporation
C
carbonation
D
condensation
11

The carbon cycle involves an exchange of carbon between _______.

A
the geosphere and atmosphere
B
the atmosphere and hydrosphere
C
the geosphere and hydrosphere
D
the geosphere, hydrosphere, and atmosphere
12

Which of the following statements about the phosphorus cycle is true?

A
In living organisms, phosphorus can be found in nucleic acids.
B
Phosphorus in aquatic ecosystems is only found in sediment.
C
Elevated levels of phosphorus in aquatic ecosystems is always beneficial.
D
The soil plays no part in the phosphorus cycle.
13

What is the relationship between the oxygen cycle and the carbon cycle?

Answer:

The oxygen cycle and the carbon cycle are related through the processes of photosynthesis and respiration. Plants produce oxygen during photosynthesis and animals produce carbon dioxide during respiration. Animals consume oxygen during respiration and plants consume carbon dioxide during respiration.

14

Plants in the desert _______.

A
effectively conserve and retain water
B
have high levels of transpiration
C
release 50-80% of water back into the ecosystem
D
make their own precipitation
15

Biogeochemical cycles _______.

A
are not essential for life
B
move through abiotic and biotic regions
C
are the result of natural disasters
D
provide the greatest amount of energy for the Earth

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