Answered: What was the estimated energy input of…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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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.

The bar graph displays the energy input and output (measured in kcal x 10^6 per hectare) for three crop types: corn grain, soybeans, and grass.

- **Corn grain**:
- Energy input: approximately 9 kcal x 10^6/hectare
- Energy output: approximately 25 kcal x 10^6/hectare

- **Soybeans**:
- Energy input: approximately 4 kcal x 10^6/hectare
- Energy output: approximately 5 kcal x 10^6/hectare

- **Grass**:
- Energy input: approximately 2 kcal x 10^6/hectare
- Energy output: approximately 12 kcal x 10^6/hectare

What was the estimated energy input of the grass?

- [ ] 4 kcal x 10^6
- [x] 2 kcal x 10^6
- [ ] 8 kcal x 10^6

The bar graph illustrates energy input and output per hectare for three crop types: corn grain, soybeans, and grass. The energy is measured in kilocalories (kcal) multiplied by ten to the power of six.

- **Corn Grain:**
- Energy Input: Approximately 18 million kcal
- Energy Output: Approximately 22 million kcal

- **Soybeans:**
- Energy Input: Approximately 4 million kcal
- Energy Output: Approximately 5 million kcal

- **Grass:**
- Energy Input: Approximately 1 million kcal
- Energy Output: Approximately 14 million kcal

The graph uses two colors to differentiate between energy input (orange) and energy output (green). Corn grain requires the highest energy input but also yields a high energy output, whereas grass shows a low energy input with a more significant energy output. Soybeans have a moderate balance between energy input and output.

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