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

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A historical experiment recreate recorded: - Starting tree mass = 2.5 kg; dry soil mass = 100.0 kg. - After 5 years of adding only pure rainwater: - Final tree mass = 80.0 kg (+77.5 kg gain); dry soil mass = 99.8 kg (-0.2 kg loss). Where did the 77.5 kg of new tree mass come from?

Soil minerals absorbed by roots provided 77.5 kg of mass. Carbon dioxide absorbed from air and water absorbed from soil provided almost all 77.5 kg of new mass. The tree created mass out of empty space. Sunlight energy converted directly into solid wood atoms.

Correct Answer:

Carbon dioxide absorbed from air and water absorbed from soil provided almost all 77.5 kg of new mass.

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