Question

The Laws of Conservation of Mass and Energy: A Rabbit's Story
In the natural world, every living organism interacts with its environment in a way that follows the Laws of Conservation of Mass and Energy. One example of a consumer that plays a crucial role in these cycles is the rabbit. Rabbits are herbivores, which means they primarily eat plants.

When a rabbit eats a plant, it consumes leaves, stems, and roots. These plant parts are rich in a sugar called glucose, which is produced through a process known as photosynthesis. During photosynthesis, plants use sunlight, carbon dioxide from the air, and water from the soil to create glucose and oxygen. When the rabbit eats the plant, it breaks down the glucose through a process called cellular respiration, which helps the rabbit convert the stored energy in the glucose into a form it can use for its daily activities, like running, jumping, and staying warm. As rabbits consume glucose, the primary product of photosynthesis, they also breathe in oxygen from the atmosphere, the second product of photosynthesis.



The primary product of cellular respiration, chemical energy (ATP), is released during cellular respiration and powers the rabbit’s movements and bodily functions. As rabbits breathe out, they release carbon dioxide, the second product of cellular respiration, back into the atmosphere. This carbon dioxide is then available for plants to use again during photosynthesis, demonstrating the connection between all of these organisms and the ecosystem.

Eventually, every rabbit will die, just like all living organisms. When this happens, the rabbit's body begins to decay. Decomposers, such as bacteria and fungi, break down the organic matter in the rabbit's body. This decaying process returns nutrients to the soil, enriching it with essential elements that plants need to grow. The carbon contained in the rabbit's body is also released. It will be released back into the atmosphere in the form of gasses, such as carbon dioxide, but it will also be released back into the soil in the form of carbon atoms.

The rabbit's life cycle illustrates the Laws of Conservation of Mass and Energy: Matter is neither created nor destroyed; it simply changes forms. The nutrients from the rabbit’s body (matter) are reused by plants, allowing them to grow and produce glucose once again. Energy is transformed through different processes, but it is always conserved in the ecosystem.

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Question 1
QUESTION 1:Using only information from the passage above, explain how the following series of events show both the Law of Conservation of Matter and the Law of Conservation of Energy:

The plants complete the process of photosynthesis to produce glucose
The rabbit eats the plants
The rabbit dies and decomposes
In your answer, include specific examples from the passage that show how matter and energy are reused or recycled rather than lost.

You may use the following guide to formulate your response if needed:

Define the Law of Conservation of Matter: "The Law of Conservation of Matter states..."
Identify examples of "matter" that are conserved through the processes identified in the passage: "The process of {example} shows that matter is recycled because..."
Define the Law of Conservation of Energy: "The Law of Conservation of Energy states...".
Identify examples of "energy" that are conserved through the processes identified in the passage: "The process of {example} shows that energy is conserved because..."

Answer 1

Define the Law of Conservation of Matter:
- The Law of Conservation of Matter states that matter is neither created nor destroyed; it simply changes forms.

Examples from the passage showing matter is conserved:
- Photosynthesis converts carbon dioxide and water into glucose and oxygen. The glucose (matter) produced by plants becomes part of the plant’s tissues.
- The rabbit eats the plants, so the glucose and other plant matter are transferred into the rabbit’s body rather than disappearing.
- When the rabbit dies, decomposers (bacteria and fungi) break down its organic matter, returning nutrients to the soil and releasing carbon back to the atmosphere as gases (like carbon dioxide) and into the soil as carbon atoms.
- Those returned nutrients and carbon are available for plants to use again to grow and produce glucose. These steps show the same atoms and nutrients being recycled rather than lost.

Define the Law of Conservation of Energy:
- The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

Examples from the passage showing energy is conserved:
- Photosynthesis uses sunlight energy to make glucose; thus light energy is transformed into chemical energy stored in glucose.
- The rabbit breaks down glucose by cellular respiration, producing chemical energy (ATP). The passage says ATP “is released during cellular respiration and powers the rabbit’s movements and bodily functions.” This shows the chemical energy in glucose is converted into usable cellular energy for the rabbit.
- Energy moves through the system (sunlight → glucose → ATP → movement/heat) but is not lost; it is transformed at each step, consistent with conservation of energy.