Question 1

Define the term hydrological cycle.

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Question 2

State one reason why carbon stored in timber products may be released more slowly than carbon released by burning.

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Question 3

State two major carbon stores in a forest ecosystem.

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Question 4

Define the term carbon source.

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Question 5

Define the term carbon sink.

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Question 6

State what is meant by evapotranspiration.

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Question 7

State the end product of nitrification that is most readily taken up by plants.

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Question 8

Distinguish between infiltration and surface runoff.

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Question 9

State the largest store of water in the hydrological cycle.

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Question 10

State the largest store of nitrogen in the nitrogen cycle.

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Question 11

Define the term nitrogen fixation.

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Question 12

Figure 3(b) compares seagrass meadows with and without green sea turtles.

Suggest how the conservation of green sea turtles could contribute to reducing atmospheric carbon dioxide levels. [2 marks]

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Question 13

Outline one way that nitrogen fixation can occur naturally.

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Question 14

Distinguish between nitrification and denitrification.

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Question 15

Outline how nitrogen enters food chains.

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Question 16

Suggest two human activities that can increase the amount of reactive nitrogen entering ecosystems.

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Question 17

Outline how photosynthesis transfers carbon from the atmosphere into a forest ecosystem.

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Question 18

Distinguish between a carbon transfer and a carbon transformation using one example of each.

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Question 19

Outline how decomposition returns carbon to the atmosphere after a tree dies.

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Question 20

Outline how energy drives the hydrological cycle.

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Topic 2.7: Biogeochemical Cycles Questions

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