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

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A student places 50 grams of fallen leaves in two mesh bags: - Bag 1 is placed in damp forest soil rich in earthworms, fungi, and bacteria. - Bag 2 is placed in sterile, completely dry soil containing no living organisms. After 8 weeks, Bag 1 leaves weigh 10 grams. Bag 2 leaves weigh 48 grams. Why did Bag 1 lose significantly more mass?

Decomposers in Bag 1 digested leaf matter, converting it into carbon dioxide, water, and soil minerals. Water dissolved all the leaves in Bag 1 without needing living organisms. Leaves in Bag 2 absorbed air and became heavier. Earthworms ate the plastic mesh bag instead of the leaves.

Correct Answer:

Decomposers in Bag 1 digested leaf matter, converting it into carbon dioxide, water, and soil minerals.

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