WVGSA Grade 5 Science Practice Questions - West Virginia General Summative Assessment Grade 5 Science Exam

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A scientist grows radish plants inside a clear sealed chamber supplied with heavy-isotope carbon dioxide gas ($^{13}CO_2$) and normal soil water ($H_2O$). After 4 weeks, chemical testing reveals that 86% of the dry carbon mass in new plant tissue contains the heavy $^{13}C$ isotope. What does this quantitative result prove?

Soil minerals provided 86% of the plant's new mass. Carbon dioxide gas absorbed from the air provides the vast majority of carbon mass building blocks for plant tissue. Water molecules convert directly into carbon atoms inside leaves. Radish roots absorb carbon directly from soil rocks.

Correct Answer:

Carbon dioxide gas absorbed from the air provides the vast majority of carbon mass building blocks for plant tissue.

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