Exam 1 -2010-Spring

Exam 1 -2010-Spring - Page 1 of 1 LASTNAME:_CODE:_ GENERAL...

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Page 1 of 1 LASTNAME:______________________CODE:_________ GENERAL ECOLOGY PCB 4043C Spring 2010 EXAM I Exam instructions: --Write your last name and code on all the pages --Make sure that all 13 pages are attached. --You may not use calculators or other electronic aids. The math needed to solve a problem should be relatively simple. If you can't do the math, just show what needs to be calculated (e.g., "answer = 0.5 x .3") --If you get hung up on a problem, skip it; return to it after you’ve answered the “easy” problems. PAGE SECTION QUESTIONS POINTS POSSIBLE SCORE 2 I Silvia’s fill in the blanks 12 3-5 II Questions 1-7: Laura 28 6 Blank Page 0 7-8 III Questions 8- 12 : Silvia 24 9-11 IV Questions 13-17: Laura 22 12 Blank Page 0 13 V Question 18: Silvia 14 TOTAL 100
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Page 2 of 2 LASTNAME:______________________CODE:_________ SECTION I. Silvia’s fill in the blanks (12 pts. total, 1pt. each blank). 1. The Gulf of Mexico’s dead zone is an area of hypoxic (less than 2 ppm dissolved oxygen) waters at the mouth of the Mississippi River caused by a process known as_______________________. 2. ___________________is the chemical transformation of N 2 to NH 3 by Rhizobium bacteria, which develop a ________________relationship with plant roots. 3. The ratio of C:N:P in marine phytoplankton is 106:16:1, a remarkably constant relationship known as the ______________________. 4. Roughly _______% of the earth’s photosynthesis occurs in the ocean. Most of it is performed by ___________________and occurs mainly on upwelling and coastal regions. 5. The chemical form of P available for plant uptake is_____________________. 6. ______________________is the ratio of assimilated energy / ingested energy. 7. An ecosystem service provided by the Florida everglades is ______________________. 8. The concentration of carbon dioxide in the atmosphere today is ___________________. 9. A difference between the N and P cycles is that the _________cycle does not have an important atmospheric component. 10. Most energy that powers life on earth comes from ____________________.
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Page 3 of 3 LASTNAME:______________________CODE:_________ SECTION II. Laura’s questions. Answer the following questions (28 pts. total, see each question for points). 1 . A group of researchers is interested in using the first principles of physics, chemistry and biology to understand how concepts of metabolism can link individual organisms to the ecology of populations, communities and ecosystems. The majority of their work involves creating mathematical models. 1a. Does this research group do basic or applied research? (1 pt) 1b. Is this research more theoretical or empirical? (1 pt) 2 . Ice is thawing on a temperate lake at the beginning of spring. During one morning of sampling, the deeper profile of the lake is 4°C and the profile above is 3°C. Does the 3°C water float or sink? (2 pts) 3. Of the following gases, CH 4 , N 2 , N 2 O, O 2 , CO 2 , 3a. Which is most abundant? (2 pts) 3b. Which are greenhouse gases? (2 pts)
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Exam 1 -2010-Spring - Page 1 of 1 LASTNAME:_CODE:_ GENERAL...

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