# Energy In Living Systems

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| By 16nelsaly
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16nelsaly
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Quizzes Created: 2 | Total Attempts: 552
Questions: 10 | Attempts: 334

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• 1.

### Energy is the capacity to do work.

• A.

True

• B.

False

A. True
Explanation
Energy is the capacity to do work, meaning that it is the ability to exert force and cause an object to move or undergo a change. This statement is true because energy is a fundamental concept in physics and is defined as the ability to perform work. Without energy, no work can be done.

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• 2.

### Which of the following is part of the first law of thermodynamics?

• A.

Kinetic energy is stored energy.

• B.

Energy cannot be transferred or transformed.

• C.

Potential energy equals kinetic energy in a reaction.

• D.

Energy cannot be created or destroyed.

D. Energy cannot be created or destroyed.
Explanation
The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed in an isolated system. This means that the total amount of energy in a system remains constant, although it can be transferred or transformed from one form to another. This principle is fundamental to understanding the behavior of energy in various physical and chemical processes.

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• 3.

### Energy in ecosystems

• A.

Flows in one direction from heterotrophs to autotrophs.

• B.

Is recycled by plants back to animals.

• C.

Flows in one direction from the sun to heat.

• D.

Is recycled by decomposers back to plants.

C. Flows in one direction from the sun to heat.
Explanation
The correct answer is "Flows in one direction from the sun to heat." This is because energy in ecosystems originates from the sun and is captured by autotrophs (plants) through photosynthesis. This energy then flows through the food chain from autotrophs to heterotrophs (animals) as they consume plants or other animals. Eventually, all energy is converted into heat and lost from the ecosystem. Therefore, energy in ecosystems flows in one direction from the sun to heat.

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• 4.

### What is the ultimate source of energy for almost all forms of life on Earth?

• A.

Solar energy

• B.

Thermal energy

• C.

Heat energy

• D.

Nuclear energy

A. Solar energy
Explanation
Solar energy is the ultimate source of energy for almost all forms of life on Earth. This is because sunlight is converted into chemical energy through the process of photosynthesis, which is used by plants to produce food. This food then becomes the primary source of energy for other organisms in the food chain. Additionally, solar energy also drives weather patterns, ocean currents, and the water cycle, which are essential for sustaining life on Earth. Thus, solar energy plays a crucial role in providing the energy needed for life to thrive on our planet.

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• 5.

### Which of the following statements below is correct?

• A.

Energy cannot be recycled throughout an ecosystem, but matter can.

• B.

Energy can be recycled throughout an ecosystem, but matter cannot.

• C.

Both energy and matter can be recycled throughout an ecosystem.

• D.

Neither energy or matter can be recycled throughout an ecosystem.

A. Energy cannot be recycled throughout an ecosystem, but matter can.
Explanation
Energy cannot be recycled throughout an ecosystem because it is constantly being transformed and lost as heat through various processes such as respiration and metabolism. However, matter can be recycled through biogeochemical cycles such as the carbon cycle, nitrogen cycle, and water cycle. These cycles allow for the movement and transformation of matter within an ecosystem, ensuring that it is not lost but rather reused and recycled.

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• 6.

### Kinetic energy is stored energy.

• A.

True

• B.

False

B. False
Explanation
The statement "Kinetic energy is stored energy" is incorrect. Kinetic energy is the energy possessed by an object due to its motion. It is not stored energy, but rather the energy of an object in motion. Stored energy is typically referred to as potential energy, which includes gravitational potential energy, elastic potential energy, and chemical potential energy. Kinetic energy is the energy of motion, while potential energy is the energy that an object possesses due to its position or condition.

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• 7.

### An object at rest has no ____ , but it may have _____ based on its location or structure.

• A.

Kinetic energy, conserved energy

• B.

Potential energy, kinetic energy

• C.

Kinetic energy, potential energy

• D.

Stored energy, potential energy

C. Kinetic energy, potential energy
Explanation
An object at rest does not possess kinetic energy because kinetic energy is the energy associated with motion. However, it may still have potential energy based on its location or structure. Potential energy is the energy that an object possesses due to its position or condition, such as gravitational potential energy or elastic potential energy.

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• 8.

### A rock on the top of a mountain has what kind of energy?

• A.

Kinetic

• B.

Potential

• C.

No

• D.

Conserved

B. Potential
Explanation
A rock on the top of a mountain has potential energy. Potential energy refers to the energy that an object possesses due to its position or condition. In this case, the rock has the potential to fall down the mountain due to the force of gravity. As it is in a higher position, it has stored energy that can be converted into kinetic energy when it starts to move downhill.

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• 9.

### Molecules that come from the food we eat provide energy for work that goes on inside our cells. This energy, stored inside of our food, is a form of ___.

• A.

Potential energy called chemical energy

• B.

Electrical energy called heat

• C.

Potential energy called entropy

• D.

Kinetic energy called heat

A. Potential energy called chemical energy
Explanation
The correct answer is potential energy called chemical energy. When we consume food, the molecules in the food are broken down during digestion and converted into a form of potential energy called chemical energy. This chemical energy is then used by our cells to perform various work and functions within our body.

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• 10.

### Organisms that cannot make their own food and must obtain energy from the foods they eat are called ___

• A.

Autotrophs

• B.

Heterotrophs

• C.

Plants

• D.

Matter

B. Heterotrophs
Explanation
Heterotrophs are organisms that cannot produce their own food and instead obtain energy by consuming other organisms. They rely on external sources for their nutritional needs and cannot perform photosynthesis like autotrophs. Plants, on the other hand, are autotrophs as they can synthesize their own food using sunlight. Matter is a general term that does not specifically describe organisms that rely on external food sources. Therefore, the correct answer is heterotrophs.

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