Ecology Test VI

Ecosystem 
Problem set I

Ecology Test 
Test 1   Test 2
Test 3   Test 4
Test 5   Test 6
Test 7   Test 8
Test 9   M/C 

Energy Calculation 
Quiz 1   Quiz 2

Human Ecology  
Quiz 1   Quiz 2
Quiz 3   

PART A: Easy Stuff: 

1. Name three biotic factors. [5]

2. Name three density dependent population growth regulators. [5]

3. Compare R and K organisms on the basis of four characteristics. [10]

4. The data in a biologist's field notebook tells you that one day they caught and tagged a bunch of fish - but the bozo forgot to say how many were caught or tagged!!! The next entry however shows a result which says they estimated the total population to be 20,000. The Ministry of Natural Resources Rules for Field Biologists requires every study to capture at least 100 fish in each study. How many fish in the recapture were marked? [10]

5. A forest measures 2 km by 3 km. A particular organism top level is on the fourth trophic level up from the photosynthesising plants. [25]
a) Draw and label the food pyramid. Give some names to the organisms.
b) If the plants produce 26000 kJ•m-2•y-1, and the fourth level organism requires 700 kJ per week, how many of these organisms can be sustainably supported by the forest?

PART B: Harder Stuff - Worth 60 % of the test. 

1. Draw the nitrogen phosphorous carbon biogeochemical cycles - all on the same diagram (overlay them). Ose only these processes: excretion, respiration, photosynthesis, decomposition, nitrogen fixation, decomposition and solution. Draw arrows for these processes. Your job now is to draw in the plants, animals, and other things which are one each end of these arrows or processes. [10]

2. Succession is:
a) a normal process.
b) an abnormal process.
c) a normal end-product.
d) an abnormal end-product.
e) none of the above. 
Explain your reasoning. [10]

3. Look at the graphs provided. A certain ecosystem was studied. Describe seven things you can deduce about organism "A". (one sentence per seven things is plenty). [20]

4. A forestry company is logging some old growth forest in Northern Ontario. The company feels that profits must grow - but the CEO's recognize that being "seen to be green" will help the company. They have decided to allow the government to pressure them into accepting only a 3% per year growth in profits. Should we be pleased with this vision? Why or why not? (there are several possible "correct" solutions - it is the reasoning which is important also). [20]