Post-emergent pesticides are described as:

• A. Applied after seedlings come up
• B. Applied before seedlings emerge
• C. Remain active in soil for years
• D. Applied to leaves and stems

Answer: (A)

Post-emergent refers to applying a pesticide after the weed or crop has emerged above the soil. This means you treat weeds once they are visible, typically by contacting their foliage with the product. The defining point is the timing—after emergence—not whether you spray leaves and stems or whether the chemical stays in the soil. While post-emergent products are often applied to leaves and stems for foliar uptake, the key idea is that the treatment occurs after seedlings have come up. The other statements describe pre-emergent timing (before emergence), or soil persistence (long-lasting in soil), which are not what post-emergent means.