Food Chains Worksheet-bio105 (1).doc

Food Chains Worksheet-bio105 (1).doc - Name Energy Laws and...

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Name: ________________ Energy Laws and Ecology Questions Complete upload by the due date 1. A field of corn contains a certain amount of food energy. If cattle eat the corn, they will gain some of that energy. How does the amount of energy in the corn compare with the amount of energy in the cattle? Is it more efficient to feed on corn or beef? In this activity, you will compare the energy content of some familiar human foods The table below lists the average amount of energy (in kilojoules per square meter of land per year) in different organisms that people use for food. Organism Energy (KJ/m 2 /year) Producer (P) or Consumer (C) Wheat cereal 3 400 P Oranges and grapefruits 4 200 P Pork (pig) 800 C Peanuts 3 850 P Rice 5 200 P Milk (cow) 1 800 NONE Potatoes 6 700 P Chicken 800 C Carrots 3 400 P Other vegetables 840 P Apples 6 300 P Peaches 3 800 P Beef (cow) 550 C Beet sugar 8 300 P Cane sugar 14 650 P Fish 8 C Corn 6 700 P Eggs (chicken) 840 NONE a. Categorize the organisms in the table as a producer or consumer by placing either a P (for producer) or C (for consumer) in the right hand column on the table. b. Calculate the AVERAGE energy of all the producers. Show all your calculations. 3400 + 4200 + 3850 + 5200 + 6700 + 3400 + 840 + 6300 + 3800 + 8300 + 14650 + 6700 = 2 67,340 kj/M /year c. Calculate the AVERAGE energy of all the consumers. Show all your calculations.
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