Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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In ecological systems, a rough rule of thumb is that when energy
is transferred from plants to plant-eaters or from prey
to predator, the efficiency is only about 10% (p. 72). Much
of this inefficiency is a consequence of the second law of
thermodynamics. Another way to think of this is that eating 1
calorie of material from an animal is the ecological equivalent
of eating 10 calories of plant material.
Humans are considered omnivores because we can eat both
plants and animals. Our food choices have significant ecological
impacts. With this in mind, calculate the ecological
energy requirements for four different diets, each of which
provides a total of 2000 dietary calories per day.

How many ecologically equivalent calories would it take
to support you for a year, for each of the four diets listed?

Total ecologically
equivalent calories
Number of calories
Ecologically equivalent
Diet
Source of calories
consumed
calories
100% plant
Plant
0% animal
Animal
90% plant
Plant
1800
1800
3800
10% animal
Animal
200
2000
50% plant
Plant
50% animal
Animal
0% plant
Plant
100% animal
Animal
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Transcribed Image Text:Total ecologically equivalent calories Number of calories Ecologically equivalent Diet Source of calories consumed calories 100% plant Plant 0% animal Animal 90% plant Plant 1800 1800 3800 10% animal Animal 200 2000 50% plant Plant 50% animal Animal 0% plant Plant 100% animal Animal
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