WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 17, Problem 5MC
Summary Introduction
Introduction:
The 10% rule says that only around 10% of the energy from one trophic level goes to the next.
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Which of the following is true about global food production?
A. If we continue growing crops for biofuel production and agricultural feed, we will be able to feed billions more people.
B. If we eliminated the production of grain-fed animals and maintained current yield and cropland, it is predicted that we could feed an additional 4,000 million people.
C. Although poverty is linked to hunger, food production is the major cause of hunger.
D. To increase food production, the only option is to increase the yield per area farmed.
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vity: Comparing Energy Resources
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Part D- This requires you to analyze a graph, answer a question and then propose an
hypothesis.
200
Part D
The bar graph shows the cost per megawatt-hour comparison of various renewable and nonrenewable energy sources in
the United States. The blue portion of the bars represents the cost of electricity. The red portion represents the additional
system costs of harnessing that type of energy. Systems costs may include equipment expenses and costs of connection
to a power grid.
S/MWh, 7% discount factor
150
100
50
0
11
Coal
Nuclear
4
15px
System
Cost of Electricity
I
di
Gas Onshore Offshore Solar PV
Wind Wind
US Energy Resources (2014)
A
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Based on the graph, compare and contrast the total cost of renewable and nonrenewable energy sources. Explain what
might account for the differences in cost. Do additional research as necessary.
BI
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In your response, examine the graph and tell which energy source (nonrenewable or…
A bird eats sunflower seeds from a bird feeder on a snowy day. Of the 1000 J of energy that was in the consumed seeds, the bird stored 10 J of energy in its body, eliminated 150 J of energy in its waste, and used the remaining energy to respire. What is the production efficiency of this bird?
Useful equation: PE = Pn/An x 100
Chapter 17 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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- Background A trophic level, or feeding level, is made up of all the organisms whose energy source is the same number of consumption steps from the sun in a given ecosystem. The trophic level of plants or producers is 1, while that of herbivores is 2 and that of animals that eat herbivores 3. Higher trophic levels can exist for animals even higher on the food chain. In this exercise, you will compute numerical values for human energy needs based on diets at different trophic levels. In this case study the owner of a farm raises soybeans and chickens. Grasshoppers feed on the farmers soybeans, and are in turn eaten by the chickens. Humans can, though rarely do, eat grasshoppers for sustenance. Humans can also eat soybeans. For the purpose of this exercise, make the following assumptions: A human requires 1 chicken/day There are 365 days/year 1 chicken eats 25 grasshoppers/day 1 grasshopper requires about 30 g of soybeans/year 1,000 grasshoppers have a mass of 1 kg 1 human requires…arrow_forwardBackground A trophic level, or feeding level, is made up of all the organisms whose energy source is the same number of consumption steps from the sun in a given ecosystem. The trophic level of plants or producers is 1, while that of herbivores is 2 and that of animals that eat herbivores 3. Higher trophic levels can exist for animals even higher on the food chain. In this exercise, you will compute numerical values for human energy needs based on diets at different trophic levels. In this case study the owner of a farm raises soybeans and chickens. Grasshoppers feed on the farmers soybeans, and are in turn eaten by the chickens. Humans can, though rarely do, eat grasshoppers for sustenance. Humans can also eat soybeans. For the purpose of this exercise, make the following assumptions: A human requires 1 chicken/day There are 365 days/year 1 chicken eats 25 grasshoppers/day 1 grasshopper requires about 30 g of soybeans/year 1,000 grasshoppers have a mass of 1 kg 1 human requires…arrow_forwardMatch each term with it's definition. a. Nutrient amount estimate to meet the nutrients eneds of 50% of the population. b. Level of intake that appears to be adequate in a given population. Level of a nutrient that appears to be enough in a population, set when research evidence is lacking. c. Nutrient amount estimate to meet the nutrients eneds of 97.5% of the population. d. Highest level of daily nutrient intake that is unlikely to pose a risk of adverse health effects. 1. Estimated Average Requirement (EAR) a 2. Tolerable Upper Limit (UL) a 3. Recommended Dietary Allowance (RDA) a 4. Adequate Intake (Al) aarrow_forward
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