Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Textbook Question
Chapter 28, Problem 3RQ
Define net primary production. Would you predict higher productivity in a farm pond or an alpine lake? Explain your answer.
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Define Net Primary Productivity. To get this right, you must mention GPP in your answer (In a way that is useful).
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A group of researchers are assessing energy availability in a terrestrial ecosystem. The image shows the food web for this ecosystem. They set up three plots and assess the biomass of producers, primary consumers, and secondary consumers. Rabbits and grasshoppers feed on ground cover plants that grow on the forest floor. Plot 1 is composed of mature hardwood trees, and only 25% of the sunlight reaches the shrubs and grasses compared to plots 2 and 3, which have fewer trees and allow more sunlight to reach the forest floor.
Based on the food web shown here, which of the following best describes how the reduction in sunlight to the forest floor would impact the number of primary consumers (squirrel, grasshopper, rabbit, and deer) in plot 1 compared to the other plots?
A - Plot 1 will show an increase in deer only because they feed on trees.
B - Plot 1 will show a decrease in squirrels and rabbits, while deer and grasshoppers will increase.
C - Plot 1 will show a decrease in rabbits and…
Chapter 28 Solutions
Biology: Life on Earth
Ch. 28 -
1. Nearly all life gets its energy from _______...Ch. 28 -
2. Photosynthetic organisms are called either...Ch. 28 -
3. Feeding levels within ecosystems are also...Ch. 28 - In general, only about ______ percent of the...Ch. 28 - Prob. 5FTBCh. 28 -
6. During the nitrogen cycle, nitrogen gas is...Ch. 28 - Prob. 7FTBCh. 28 - Prob. 1RQCh. 28 -
2. What is a producer? What trophic level does it...Ch. 28 - 3. Define net primary production. Would you...
Ch. 28 - Name the first three trophic levels. Among the...Ch. 28 - How do food chains and food webs differ? Which is...Ch. 28 - Define detritivore and decomposer and explain...Ch. 28 -
7. Trace the movement of carbon from one of its...Ch. 28 - Prob. 8RQCh. 28 - Trace a pathway of a phosphorus molecule from a...Ch. 28 - Trace the movement of a water molecule from the...Ch. 28 -
1. Humans are omnivores who can feed on several...Ch. 28 - Define and give an example of biological...Ch. 28 - Discuss the contribution of human population...Ch. 28 - Describe what would happen to a population of deer...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In what type of ecosystem would you find high productivity? Why or why not? Explain your answer.arrow_forwardCalculate the fraction of energy available after climbing up 3 trophic level(s). Express it as a decimal fraction and percent. Include the units in your answer, where appropriate. don't copy from other sourcesarrow_forwardTo generate biogas the required biomass resources must be on wet form, else biogas will not produce. How do you disagree or agree with this statement? Justify your answerarrow_forward
- Figure 46.8 Why do you think the value for gross productivity of the primary producers is the same as the value for totall heat and respiration (20,810 kcal/ m2/yr)?arrow_forwardTumucumaque National Park ecosystem For each bullet point, describe how each primary producer helps the ecosystem and how the black spider Monkey Consumer helps the ecosystem. Please answer the following question below with at least 2-4 bullet points straight to the point for ONE presentation slide for the following ecosystem Tumucumaque National Park. Banana primary producer (ONE PRESENTATION SLIDE) Black Spider Monkey Consumer (ONE PRESENTATION SLIDE)arrow_forwardThis conceptual model to the right shows the flow of energy through a spring ecosystem in Silver Springs, Florida from Figure 46.8 in your textbook. 7a. Which value/number on this diagram represents gross primary productivity (GPP)? Express using the units kcal/m?/yr. Sunlight 1,700,000 kcalim?lyr Primary producers 13,187 20,810 7,618 4,250 Primary consumers 7b. Which value/number represents net primary productivity (NPP)? Express using the units kcal/m?/yr. 2,265 3,368 1,103 720 Secondary consumers 272 383 111 90 7c. What accounts for the difference in GPP and NPP? Tertiary consumers 16 21 5 Decomposers 7d. What is the efficiency of energy transfer between the primary producers and the primary consumers? Is this more or less efficient than the transfer between a 5,060 5,060 Total heat and respiration 20,810 secondary consumer and tertiary consumer? Explain. respiration + heat to decomposersarrow_forward
- The question is in the image below.arrow_forwardb) Describe the relationship between Gross Primary Productivity (GPP), Net Primary Productivity (NPP), and Respiration (R)- but do not use any of these terms! How would you describe it to someone who does not like all those technical words? Coarrow_forwardThis conceptual model to the right shows the flow of energy through a spring ecosystem in Silver Springs, Florida from Figure 46.8 in your textbook. 7a. Which value/number on this diagram represents gross primary productivity (GPP)? Express using the units kcal/m?/yr. Sunlight 1,700,000 kcal/m?lyr Primary producers 13,187 20,810 7,618 4,250 Primary consumers 7b. Which value/number represents net primary productivity (NPP)? Express using the units kcal/m²/yr. 2,265 3,368 1,103 720 Secondary consumers 272 383 111 90 7c. What accounts for the difference in GPP and NPP? Tertiary consumers 16 21 Decomposers 7d. What is the efficiency of energy transfer between the primary producers and the primary consumers? Is this more or less efficient than the transfer between a secondary consumer and tertiary consumer? Explain. 5,060 5,060 Total heat and respiration 20,810 respiration + heat to decomposersarrow_forward
- Would you expect a desert annual (a drought escaper) to have high or low water use efficiency? Explain your answer.arrow_forwardAssume that the producer level in your trophic pyramid contains 12,000,000 kcal of energy. Write the number of kcal that would be available to the other two levels of the pyramid.arrow_forwardDistinguish between gross primary productivity (GPP) and net primary productivity (NPP)arrow_forward
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