Question

why are plant roots important to prevent erosion? a. plant roots build a barrier, preventing wind or rain from reaching soil. b. plant roots anchor the soil in place. c. plant roots absorb the water that would otherwise wash away soil. d. plant roots take up space, leaving very little soil present to erode.

Explanation:

• Option A: Plant roots are underground and don't build a barrier above to block wind/rain from soil. Leaves or stems might, but roots don't. Eliminate A.
• Option B: Plant roots grow into the soil and hold (anchor) it, preventing it from being washed away by water or blown away by wind. This is a key way roots prevent erosion.
• Option C: While roots absorb water, their main role in erosion prevention is anchoring soil, not just absorbing water. Absorbing water alone isn't the primary mechanism for preventing erosion. Eliminate C.
• Option D: Roots don't reduce soil volume to prevent erosion. Soil is still present around roots, and erosion is about movement of soil, not its volume. Eliminate D.

Answer:

B. Plant roots anchor the soil in place.