# What is the ultimate source of energy for all organisms

Lab 12 Model Ecosystems Lab Activity

Use your textbook, notes and this website to answer the pre lab questions. http://www.vtaide.com/png/foodchains.htm http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/FoodChains.html http://www.mbgnet.net/

&nbsp;Pre Lab Questions:

1.&nbsp; What is the ultimate source of energy for all organisms on this planet?

2.&nbsp; List the biomes of the Earth.

3.&nbsp; What biome do we live in here in Philadelphia?

4.&nbsp; What attributes define a biome?

Click on the link below to access the online lab. http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/pages/ModelEcosystems.html

Download and print the instructions for reference as you work through the lab.&nbsp; As you work through the lab fill in the table below.&nbsp; Use this information to answer the questions that follow contained in this document.

5. Complete all five ecosystems and record your data in Table 1.&nbsp; The different ecosystems are listed across the top.&nbsp; Fill in the data for each trophic level for each ecosystem.&nbsp; For the numbers click on the [Pyramid of Numbers] button.&nbsp; Next click on the [Pyramid of Energy] button. Calculate the Energy Conversion Efficiency Ratio (ECE) by dividing the higher trophic level energy by the energy one trophic level down.

List the organisms by name.&nbsp; Provide the number of organisms present.&nbsp; Provide the amount of energy present.&nbsp; Calculate the ECE value.&nbsp; This value will be a decimal value.&nbsp; There is no ECE calculation for producers as you would have to divide the producer energy by the amount of energy provided by the sun.&nbsp; We don’t have that value.&nbsp; I have done the first column for you. 🙂

If you have any organisms out of place in the pyramid you will not be able to get the numbers you need to complete the calculations.&nbsp; You need to move the various organisms to their correct positions in order to continue.

See the Table 1 in attachment

Just so you know exactly how to calculate the ECE

A = 623/6011 = .103

B = 61/623 = .097

C = 6/61 = .098

Post Lab Questions

6.&nbsp; What is the relationship of numbers to energy as you go up the trophic levels?

7.&nbsp; From the ecosystems you studied in this lab, which one is the most efficient?&nbsp; Explain how you determined your answer.

8.&nbsp; What would happen to an ecosystem without decomposers?

9.&nbsp; From the ecosystems you studied in this lab, which one is the most productive?&nbsp; (This cannot be the same as question 7)&nbsp; Explain how you determined your answer.

Attachment:- bio table.docx

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