Essay Key Exam 1

Essay Key Exam 1 - Essay Key Exam1.W2008 I always go back...

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Essay Key Exam1.W2008 I always go back at least twice to check my grading for fairness. Those of you who  received points off were either mistaken, incomplete, or plagiarized. I didn’t grade on just  how many words you used, so you could have been concise and answered fully based  on my list of criteria; or you could have said a lot and not have actually answered the  questions. Note: Never quote someone else’s words, even if you give them credit. This is an exam! If you did an exceptionally excellent job, or if you were shy on one answer but thorough  on another, I took that into consideration when assigning points. Below, find out what was expected in your answers to earn full credit Reading these will  help you with future exam essays. I’ve included some of the best student responses  ( “Good student answer” ). I did not cite them, to protect their privacy. ( “Expanded student  answer”  indicates they went beyond the call of duty.)  (Red highlights are my words.) 1. Environmental experts have identified five underlying causes of the  environmental problems we face. What are the five basic causes according to  your textbook? 2 points The minimal answer is *Population Growth *Wasteful Resource Use *Poverty *Poor Environmental Accounting *Ecological Ignorance 2. List two benefits to this planet that insects provide.  1 point Good student answer: First, some insects feed on pollen, and when they move from flower to flower to collect  pollen the pollinate plants, allowing the plants to reproduce… Second, some insects feed  on other insects, and so they are the natural pest control system because they keep pest  insect populations in check.
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3. Name 5 reasons why microbes are said to be the real rulers of the earth.  3 points Good student answer: Microbes are said to be the real rulers of the earth because they are everywhere and  because they sustain life on earth. They convert nitrogen for plants to use (otherwise  plants couldn't survive), break down food in our digestive tract (otherwise we wouldn't be  able to digest), decompose wastes (otherwise nutrients wouldn't be recycled and wastes  would build up), and they are utilized by us to fight disease and create fermented foods. 4. Define pH and the pH scale. How is the pH scale used? What is it a measure of,  exactly?  3 points For full credit, must include: pH is a measure the hydrogen ion concentration, [H + ] (in water). The pH scale measures acidity and alkalinity
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This note was uploaded on 09/18/2009 for the course BIO 120 taught by Professor Staff during the Fall '07 term at USC.

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Essay Key Exam 1 - Essay Key Exam1.W2008 I always go back...

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