Which of the following sequences CORRECTLY represents the flow of energy through living systems? Question 7Select one: a. Light > photosynthesis > carbohydrate > cellular respiration > ATP > heat b. Water > photosynthesis > carbohydrate > cellular respiration > ATP > water c. Water > photosynthesis > carbohydrate > cellular respiration > ATP > CO2 d. Light > photosynthesis > carbohydrate > cellular respiration > ATP > water
Question
Which of the following sequences CORRECTLY represents the flow of energy through living systems?
Question 7Select one:
a. Light > photosynthesis > carbohydrate > cellular respiration > ATP > heat
b. Water > photosynthesis > carbohydrate > cellular respiration > ATP > water
c. Water > photosynthesis > carbohydrate > cellular respiration > ATP > CO2
d. Light > photosynthesis > carbohydrate > cellular respiration > ATP > water
Solution
The correct sequence that represents the flow of energy through living systems is:
a. Light > photosynthesis > carbohydrate > cellular respiration > ATP > heat
Here's why:
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Light: The process begins with the absorption of light by the chlorophyll in plants.
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Photosynthesis: The absorbed light energy is used in the process of photosynthesis to convert water and carbon dioxide into glucose (a type of carbohydrate) and oxygen.
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Carbohydrate: The glucose (carbohydrate) produced is then used by the plant for growth and reproduction. It can also be consumed by other organisms.
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Cellular respiration: In the cells of organisms, glucose is broken down in a process called cellular respiration. This process produces ATP (adenosine triphosphate), which is the main energy currency of cells.
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ATP: The ATP produced is used to power various cellular processes.
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Heat: Some of the energy from ATP is lost as heat during these processes. This is in accordance with the second law of thermodynamics, which states that no energy transformation is 100% efficient and some energy is always lost as heat.
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