Answered: What was the estimated energy input of…

Nutrition Now

8th Edition

ISBN:9781337415408

Author:Brown

Publisher:Brown

Chapter21: Phytochemicals

Section: Chapter Questions

Problem 1RQ

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As scientists research and develop biofuels, they are faced with many tradeoffs. A plant's usefulness for biofuels depends on how much energy can be collected from the plant matter. In addition, growing plants on a large scale requires energy—such as the gasoline and power needed to run tractors and other harvesting equipment or the energy needed to create and distribute fertilizers and pesticides. An efficient biofuel would maximize the ratio of energy output to energy input.

The following graph illustrates the results of a 10-year study analyzing three different crops used in biofuel production. The data show how much energy was required to grow each crop on 1 hectare of land (energy input) and how much energy was recovered from the total crop on each hectare of land (energy output). A hectare is a measurement of an area of land and is roughly the same as 2.5 acres.

What was the estimated energy input of the grass?

A. kcal x 10^6

B. 2kcal x 10^6

C. 8kcal x 10^6

As scientists research and develop biofuels, they are faced with many tradeoffs. A plant's usefulness for biofuels depends on how much energy can be collected from the plant matter. In addition, growing plants on a large scale requires energy-
such as the gasoline and power needed to run tractors and other harvesting equipment or the energy needed to create and distribute fertilizers and pesticides. An efficient biofuel would maximize the ratio of energy output to energy input.
The following graph illustrates the results of a 10-year study analyzing three different crops used in biofuel production. The data show how much energy was required to grow each crop on 1 hectare of land (energy input) and how much energy
was recovered from the total crop on each hectare of land (energy output). A hectare is a measurement of an area of land and is roughly the same as 2.5 acres.
Energy (kcal x 10^6) per hectare
25
Energy input
I Energy output
20
15
10
5
Corn grain
Soybeans
Grass
Сгор type
What was the estimated energy input of the grass?
O 4kcal × 106
2kcal x 100
O 8kcal x 106

Energy (kcal x 10^6) per hectare
25
Energy input
Energy output
15
10
Corn grain
Soybeans
Grass
Сгоp type
20

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