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UCSB EEMB 171 - EEMB 171 Quiz 2 Practice

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Your Name:EEMB/ES 171: Fall 2018 Quiz # 2 Read each question carefullyUse the back if you need toFor T/F questions, if False, explain briefly why.1. (8). T/F: Plants growing in a low nutrient environment generally have higher C/N ratios thanthose in higher nutrient environments.2.(8). T/F: All plants wilt and die when the water potential drops to –1.5 MPa. 3. (8). T/F: Plants take up their carbon from soil organic matter.Your Name:4. (16) Consider a bacterium in the soil asshown here. Assume that water is neither flowing into or out of the bacteriumThe bacterium has a low (s because it has accumulated amino acids. The bacterium can handle a maximum (p of +0.4 MPa—if it goes above that, the cell will rupture. A. (8) What must the (s of the soil solution be (assuming that there are no other components of (w to worry about?B. (8) If you now water the soil to abruptly raise the (m of the soil to –0.01 MPa, what will happen to the supply of small labile organic molecules and nitrogen that is free in the soil? Why?Your Name:5. (18) You do a study on the decomposition of three different plant species. You collect litter from each and place them separately in litter bags. You place them in the field in two different forest ecosystems and measure their decomposition rate. Decomposition constantk in different sitesPlant species Lignin N Site #1 Site #2Alpha 30% 1.0% -0.1 -0.05Beta 25% 2.5% -0.3 -0.15Gamma 20% 1.0% -0.2 -0.1A. (8) Why does Species Beta decompose faster than species Gamma? B. (10) What factors might explain why the litters decompose differently in the two sites? Offer TWO hypotheses.Your Name:6. (14) You are studying a plant that forms thin, nitrogen-rich leaves and has a high photosynthetic rate. It is native to an area where there are many herbivorous insects (e.g. caterpillars, leaf-miners, and beetles). Yet, this plant does not get eaten by these insects. Are you surprised? Why or why not? What plant mechanism might explain this pattern? 7. (14) Why do N-fixing plants often dominate in early primary successional environments such as recently deglaciated sites in Alaska and the volcanic ash fields on Mt. St. Helens?Your Name:8. (14) A farmer explains to you that she is concerned about her role in global climate change, and so to help manage fertilizer use, she monitors trace gas emissions from her fields. She says that she never measures any N2O coming off her fields, so she’s confident that she is not contributing to global warming via N2O emissions. How do you


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