Which biome is characterized by deep, nutrient-rich soil that supports many grass species?

• A. Deserts
• B. Taiga Biome
• C. Temperate Grassland
• D. Tropical Forest

Answer: (C)

Think about how soil quality shapes what kinds of plants can dominate a biome. Deep, nutrient-rich soils let grasses grow quickly, develop extensive root systems, and recover after grazing or fires. In temperate grasslands, rainfall is enough to support grasses but not so abundant that trees take over, and regular fires or grazing reduce woody encroachment. All of this builds a thick humus layer and keeps nutrients in the soil, so many grass species can thrive over large areas.

Deserts tend to have shallow, poor soils with limited organic matter and water, which doesn’t favor grasses. Taiga soils are often acidic and nutrient-poor because of slow decomposition and heavy tree litter. Tropical forests, while lush aboveground, usually have rapid nutrient cycling and soils that aren’t deep or highly enriched, with nutrients held in biomass rather than in the soil.

So the described characteristic best matches temperate grasslands.