Praxis 5005 Practice Test Practice Question
A researcher conducted an experiment to investigate the interactions between a certain plant and its environment. The researcher placed the plant in a sealed container, placed the container and the plant next to a light source, and monitored the levels of oxygen and carbon dioxide gases inside the container. At the beginning of each day, the researcher opened the container to allow air to enter the container. The researcher recorded the following observations. 1. The plant needed to be watered daily. 2. The mass of the soil did not change over two months. 3. The amount of carbon dioxide decreased daily. 4. The amount of oxygen increased daily. Which of the following statements is best supported by the researcher's observations?
Correct Answer: C
Rationale: The observations strongly support that the plant carried out photosynthesis. The increase in oxygen and decrease in carbon dioxide indicate that the plant is converting carbon dioxide and water into glucose and oxygen, a hallmark of photosynthesis.
Option A is incorrect because the mass of the soil remained unchanged, suggesting that the plant did not rely on it for food. Option B misinterprets the gas exchange; while the plant produced oxygen, it does not absorb more oxygen than it releases. Option D is inaccurate as plants do not convert water into carbon dioxide; rather, they utilize carbon dioxide during photosynthesis.
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