Agronomy Degree Practice Exam

Which crop typically requires a taproot system?

1. Corn

2. Wheat

3. Cotton

4. Sesame

The correct answer is: Cotton

Cotton is the crop that typically requires a taproot system. The taproot is a primary root that grows deep into the soil, allowing the plant to access moisture and nutrients from lower soil layers, which is particularly beneficial in regions with variable rainfall or drought conditions. The extensive root system of cotton helps it establish stability in the soil and enhances its ability to compete for resources. In contrast, corn and wheat generally have fibrous root systems, which consist of many small roots that develop close to the soil surface. These crops thrive in well-drained, nutrient-rich environments and do not primarily rely on a deep taproot for nutrient uptake. Sesame, while it can develop a somewhat deeper root system compared to annual crops like corn and wheat, typically does not have the pronounced taproot characteristic of cotton. Therefore, the adaptation of cotton to a taproot system allows it to thrive in various soil conditions and is a key factor in its agronomic success.