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Exam 1 -2010-Spring.pdf

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Department
Agronomy
Course
PCB 4043C
Professor
Christou
Semester
Spring

Description
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 SCORE POSSIBLE 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 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 3y 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 ____________________. 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, N2, N2O, O 2 CO ,2 3a. Which is most abundant? (2 pts) 3b. Which are greenhouse gases? (2 pts) 4. Circle the correct answer: 4a. The majority of the radiation entering the Earth’s atmosphere enters with what general wavelength? (2 pts) Longwave or shortwave 4b. Which type of energy passes less easily through greenhouse gases? (2 pts) Longwave or shortwave Page 4 of 4  LASTNAME:______________________CODE:_________  4c. If incoming radiation is absorbed by a surface (for example, soil), which of the following is true: (2 pts) a) The reradiated energy has a longer wavelength and has less energy than before being absorbed. b) The reradiated energy has a shorter wavelength and has more energy than before being absorbed. c) The reradiated energy has a shorter wavelength and less energy than before being absorbed. 4d. If incoming radiation is reflected by a surface (for example, snow), which of the following is true: (2 pts) a) The wavelength of reflected radiation is shorter than the initial radiation. b) The wavelength of reflected radiation is much longer than the initial radiation. c) The wavelength of reflected radiation is about the same as the initial radiation. 5. Use the outline of a Whittaker diagram below and small symbols to complete the following: 5a. Place an open circle where you would expect temperate seasonal forest. (1 pt) 5b. Place a square where you would expect tundra. (1 pt) 5c. Use a closed circle to indicate the area corresponding to tropical rainforest. (1 pt) Page 5 of 5  LASTNAME:______________________CODE:_________  6. Use the Walter climate diagrams below to answer the following questions. 6a. Answer True or False. Both of these sites are likely to be limited by water during a large part of the potential growing season. (2 pts) 6b. In which site does the growing season last all year (use a and b to refer to the sites)? (2 pts) 6c. Which of these figures could represent a temperate forest?(2 pts) 7. Draw a graph showing a trade-off between seedling mortality and seed mass. Clearly label the x and y-axes and draw a line to show the trend that you would expect between the two variables. (3 pts) Page 6 of 6  LASTNAME:______________________CODE:_________  BLANK PAGE – EXTRA SPACE Page 7 of 7  LASTNAME:______________________CODE:_________  Part III. Silvia’s questions. Answer the following questions (24 pts. total, see each question for points). 8. Rank these global carbon reservoirs in order from largest to smallest, with 1 as the largest and six as the smallest (3 pts). ____Atmosphere ____Terrestrial vegetation and soils ____Fossil fuels ____Rocks ____Marine biota ____Intermediate and deep oceans 9. From the following pairs of conditions that influence decomposition of organic matter, choose the condition (either A or B) in each case that is conducive to faster decomposition (1 pt. each, 6 pts total) _______ A. Soil temperature of 4 °C B. Soil temperature of 20 °C _______ A. Soil with 40% clay content B. Soil with 10% clay content _______ A. Moist soil conditions B. Wet soil conditions _______ A. High lignin content litter B. Low lignin content in litter _______ A. Soil pH of 2 B.
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