Science Assesment 6

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timer Asked: Oct 17th, 2018
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Please do following quiz attached below and let me know if you have any questions. if you take your time and do good job i will tip you.

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Surname 1 In general, litter with a C/N ratio greater than 30 leads to immobilization, litter with a C/N ratio less than 20 leads to mineralization, and litter with a C/N ratio of 20-30 leads to a balance of immobilization and mineralization resulting in no net N production. If garlic mustard leaf litter collected on the forest floor had 43.2 percent C and 1.16 percent N, this tissue would lead to __________. immobilization mineralization a balance of immobilization and mineralization preferential consumption 4 points Question 2 1. What happens to most of the nitrogen in a leaf every autumn? It is resorbed by the tree. It is released as N2 gas. It is broken down in soil. It is consumed by decomposers. 4 points Question 3 1. Net primary productivity in an ecosystem increases as mean annual temperature ____________. and mean annual rainfall decreases decreases and mean annual rainfall increases increases and mean annual rainfall decreases and mean annual rainfall increases 4 points Question 4 1. Which region contains the largest amount of the global nitrogen pool? Fossil fuels Aboveground terrestrial systems Ocean Surname 2 Atmosphere 4 points Question 5 1. An ecologist studying productivity in a sample of grasses measures gross primary productivity as 1000 kcal/m2/yr and autotrophic respiration as 100 kcal/m2/yr. Based on these calculations, the net primary productivity would be 10 kcal/m2/yr. 900 kcal/m2/yr. 1100 kcal/m2/yr. 10,000 kcal/m2/yr. 4 points Question 6 1. Match the answer to the question. Put the correct letter in blank below ________ is the process by which plants absorb a portion of their nutrients from senescing tissues to be stored and used for the production of new tissues. The breakdown of chemical bonds that were formed during the construction of plant and animal tissues is called ________. The release of organically bound nutrients into an inorganic form is called ________. The introduction of high levels of nutrients into a body of water is called ________. Precipitation brings appreciable quantities of nutrients into ecosystems that are collectively called ________. Large quantities of nutrients are bound tightly in ________ structure; they are not readily available until released by the activities of decomposers. Some nutrients are ________ from the soil and carried out of ecosystems by underground water flow to streams. Surname 3 The element ________ is a basic constituent of all organic compounds and is involved in the fixation of energy by photosynthesis. The difference between the rate of carbon uptake in photosynthesis and the rate of carbon loss due to autotrophic and heterotrophic respiration is the net ________ productivity. Nitrogen is generally available to plants in only two forms: ammonium and ________. Biological nitrogen fixation is accomplished by symbiotic ________ living in mutualistic association with plants. Nitrogen can be returned to the atmosphere when certain bacteria convert it from nitrate into nitrogen gas, which is a process called ________. Microbial decomposition of organic matter results in NH4+ production through a process called ________. Nearly all of the phosphorus in terrestrial ecosystems comes from the ________ of calcium phosphate minerals. ___________ develop as a result of incomplete decomposition of organic matter in swamps and marshes. The process of ____________ produces a form of nitrogen that is easily lost from soil through leaching. ____________ is when too much nitrogen enters an ecosystem and causes forest decline. _________ primary productivity is the total rate of photosynthesis or energy assimilated by plants. Plants assimilate energy through the process of _______________. 1. ___________is the process that releases carbon dioxide in the atmosphere. A. leached B. nitrogen saturation Surname 4 C. respiration D. bacteria E. weathering F. nitrate G. nitrification H. decomposition I. ammonification J. fossil fuels K. eutrophication L. organic M. wetfall N. photosynthesis O. carbon P. mineralization Q. net R. denitrification S. ecosystem T. retranslocation U. gross 40 points Question 7 1. First describe three ways that nutrients can be lost from an ecosystem; then describe how nutrients are replaced in those systems. Your response should be at least 75 words in length. ...
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Tutor Answer

rickieRay
School: New York University

Hey pal, the below paper document has now included question 8. Keep calm and ping on me in case of any changes or revision.

Surname 1

In general, litter with a C/N ratio greater than 30 leads to immobilization, litter with a
C/N ratio less than 20 leads to mineralization, and litter with a C/N ratio of 20-30 leads to a
balance of immobilization and mineralization resulting in no net N production. If garlic mustard
leaf litter collected on the forest floor had 43.2 percent C and 1.16 percent N, this tissue would
lead to __________.Answer- a balance of immobilization and mineralization
immobilization
mineralization
a balance of immobilization and
mineralization
preferential consumption
4 points
Question 2
1. What happens to most of the nitrogen in a leaf every autumn?
Answer- It is resorbed by the tree.
It is resorbed by the tree.
It is released as N2 gas.
It is broken down in soil.
It is consumed by
decomposers.
4 points
Question 3
1. Net primary productivity in an ecosystem increases as mean annual temperature
____________.Answer- increases and mean annual rainfall decreases
and mean annual rainfall decreases
decreases and mean annual rainfall
increases

Surname 2

increases and mean annual rainfall
decreases
and mean annual rainfall increases
4 points
Question 4
1. Which region contains the largest amount of the global nitrogen pool?
Answer- Atmosphere
Fossil fuels
Aboveground terrestrial
systems
Ocean
Atmosphere
4 points
Question 5
1. An ecologist studying productivity in a sample of grasses measures gross primary
productivity as 1000 kcal/m2/yr and autotrophic r...

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Anonymous
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