Exam 1 -2010-Spring_key

Exam 1 -2010-Spring_key - Page 1 of 1 LASTNAME:_CODE:_...

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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___ eutrophication ____________________. 2. ______ N fixation ________is the chemical transformation of N 2 to NH 3 by Rhizobium bacteria, which develop a _______ symbiotic _________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 _____ Redfield Ratio _________________. 4. Roughly ___ _50 ___% of the earth’s photosynthesis occurs in the ocean. Most of it is performed by ________ phytoplankton __and occurs mainly on upwelling and coastal regions. 5. The chemical form of P available for plant uptake is___ Phosphate (PO 4 -3 )___________. 6. ______ Assimilation efficiency ___is the ratio of assimilated energy / ingested energy. 7. An ecosystem service provided by the Florida everglades is _ water filtration/tourism/air cleaning/water cleaning/habitat for animals and plants/biodiversity preservation/etc. _. 8. The concentration of carbon dioxide in the atmosphere today is __ 375-385 ppm or 0.03%___. 9. A difference between the N and P cycles is that the __ P _______cycle does not have an important atmospheric component. 10. Most energy that powers life on earth comes from ____ the sun/light ________________.
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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.
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Exam 1 -2010-Spring_key - Page 1 of 1 LASTNAME:_CODE:_...

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