Praxis II: Biology Content Knowledge Exam Prep

Answer: B, Plants obtain water and nutrients from the environment through roots. Roots also serve to anchor plants in the ground.

Key Takeaway: After extracting nutrients from the soil, roots then pass those upward through the xylem and phloem to the stem and leaves. Conversely, organic nutrients created through the photosynthetic process are passed down from the leaves and stored in the roots. The absorptive capability of roots is greatly enhanced by a system of root hairs that radiate from the roots. This explains the look and texture of roots after you pull a plant up from the ground.