The Carbon Cycle

In what process is Carbon transformed into chemical energy?

• Photosynthesis
• Respiration
• Primary Production
• Secondary Production

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If the plant population decreased, the amount of carbon would _________.

• Stay the same

• Increase

• Decrease

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Which of the following is the best conclusion that can be made from this graph?

• atmospheric carbon dioxide levels have been decreasing since 1960
• Hawaii has a lot of carbon dioxide
• humans have been working hard to decrease carbon dioxide levels
• atmospheric carbon dioxide levels have increased steadily since 1960

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There is a cypress trees in Florida with a tree trunk diameter of about 3.5 m. What is the source of most of the carbon in the cypress tree?

• The carbon created by the tree during photosynthesis.

• The carbon stored in tree seeds.

• The carbon dioxide molecules the tree absorbed from the atmosphere.

• The nutrients containing carbon that the tree absorbed from the soil.

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How does Carbon in the grass become part of a Tertiary consumer?

• The lion eats the grass

• The carbon ends up in the lion's food chain

• Carbon from grass does not end up in the lion's food chain

• The lion breathes in carbon dioxide given out by the plants

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In respiration, what is consumed, and what is produced?

• CO2, oxygen

• CO2, energy

• Oxygen, CO2

• Oxygen, energy

Identify the two processes that assist carbon through ecosystems.

• evaporation and condensation

• photosynthesis and respiration

• photosynthesis and evaporation

• condensation and respiration

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Step one represents what process?

• Animals are releasing energy into the environment and storing carbon.

• Animals are decomposing and releasing carbon into the soil.

• Animals are converting carbon dioxide from the atmosphere to oxygen.

• Animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.

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The amount of carbon dioxide in Earth's atmosphere has increased by about 39% since the beginning of the Industrial Revolution. Plants and oceans have been able to absorb about 55% of this extra carbon dioxide. Which statement best describes what has happened to the other 45% of the carbon dioxide?

• It has moved out of Earth's atmosphere, into space.

• It has stayed in Earth's atmosphere, acting as a greenhouse gas.

• It has been absorbed by precipitation and fallen to the ground as acid rain.

• It has been absorbed by hardening lava flows and newly formed sedimentary rocks.

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Identify which is MOST accurate.

• A finite amount of carbon exists on Earth, and it moves through living and nonliving materials through the carbon cycle.

• The amount of carbon in the universe cycles, gradually increasing as it moves up the food chain, and decreasing until the next phase of the cycle.

• Carbon flows through the food chain as animals eat it, then decomposes and is permanently removed from the system when the fod chain is complete.

• Carbon enters Earth's atmosphere when animals exhale, then moves into space where its amount steadily increases, and finally moves back into Earth's atmosphere to be used again.

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