From: Subject: C_CYCLE Date: Thu, 11 Jun 2009 12:52:22 +0100 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0030_01C9EA93.76A5A8B0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0030_01C9EA93.76A5A8B0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://uk.geocities.com/biodesk/c_cycle.htm C_CYCLE

The Carbon Cycle- some questions.

  

Questions

1. Name A, B, C.

2. Name two organisms that might be found at E

3. Suggest TWO descriptions for process X

4. What does D represent?

5. Why are there two arrows linking carbon dioxide and plants?

6. What does the line linking E to B and C signify?

7. And the line from E to carbon dioxide?

8. Which cycle is the most mobile -carbon or nitrogen? Explain your=20 answer.

9. How do mans' activities affect both cycles?

10. What is the current carbon dioxide level in the atmosphere? (Use = %)

 

Answers

  1. Primary(A), Secondary(B) and Tertiary Consumers(C)=20
  2. Earthworms, fungi, etc etc.=20
  3. Burning of fossil fuels; weathering (e.g. of calcium carbonate)=20
  4. Carbon in sediments and rocks/fossil fuels.=20
  5. Plants take in carbon dioxide for (the light independent part of)=20 photosynthesis. They release it during cell respiration.=20
  6. That decomposers may themselves be consumed.=20
  7. Decomposers respire and release carbon dioxide.=20
  8. In general terms C is the answer. It has a substantial gaseous=20 phase-whereas C may be 'locked up' in soil. However N is readily = leached from=20 soil into watercourses. In summary, both are much more mobile than = Phosphorus=20 (you may care to ponder why!)=20
  9. Burning fossil fuels-enhances levels of both gases. Increased = carbon=20 dioxide may well foster increased plant growth which-in theory would = soak up=20 the extra. Or it may well increase the amounts stored in oceanic sinks = (sediments). In reality the jury is still out. Man's production of N=20 fertilisers has led to substantial increases in environmental N (e.g. = through=20 leaching of agro-chemicals into freshwater).=20
  10. A figure of 0.035% is generally quoted.
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