Difficulty: Easy

Average Score: 75%

In a theoretical experiment of a mouse and plant, where both survive in a closed environment with available sunlight, which statement is true?

Diagram for question

Rationale

The plant produces O2 which is necessary for the mouse to use in cellular respiration.

In the process of photosynthesis, plants take in sunlight, water, and carbon dioxide (CO2), converting them into glucose (a type of sugar) and oxygen (O2). This oxygen is released into the environment and used by animals, such as the mouse in this experiment, in the process of cellular respiration.

A (The plant produces O2 which is necessary for the mouse to use in cellular respiration) CORRECT

This is the correct answer. In photosynthesis, plants produce oxygen as a byproduct, which is essential for animals to carry out their cellular respiration. This process involves the use of oxygen to convert food into energy.

B (The plant produces CO which the mouse uses in cellular respiration) YOUR ANSWER

This choice is incorrect. Plants do not produce carbon monoxide (CO) during photosynthesis. Additionally, animals do not use carbon monoxide in cellular respiration. In fact, carbon monoxide is a poisonous gas that can be harmful to most living organisms.

C (The mouse produces O2 as a waste product of cellular respiration) YOUR ANSWER

This choice is incorrect. Mice, like all animals, use oxygen (O2) in cellular respiration and produce carbon dioxide (CO2) as a waste product, not oxygen.

D (The mouse produces CO2 which is used by the plant to begin photosynthesis) YOUR ANSWER

While this statement is technically true, it does not fully answer the question. It only describes one part of the exchange between the mouse and the plant. The mouse does indeed produce CO2, which the plant uses in photosynthesis, but the mouse also relies on the plant's production of oxygen for its own survival.

Conclusion

In a closed environment, plants and animals coexist thanks to the exchange of oxygen (O2) and carbon dioxide (CO2) between them. Plants produce oxygen through photosynthesis, which animals then use for cellular respiration. The waste product of this process, CO2, is then used by plants to continue photosynthesis. This interdependence is a fundamental part of our ecosystem.

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