Weeds reduce crop yields primarily by competing for moisture, light, and soil nutrients. Which option best captures this combined effect?

Weeds reduce crop yields primarily by competing for moisture, light, and soil nutrients. Which option best captures this combined effect?

• A. Moisture
• B. Light
• C. Soil nutrients
• D. Moisture, light, and soil nutrients

Answer: (D)

The main idea is that yield loss from weeds comes from competing for multiple essential resources at once. Weeds take up water, shade the crop to reduce intercepted light, and use soil nutrients, so the crop faces reduced moisture, less light for photosynthesis, and lower nutrient availability all at the same time. That combination explains why yield drops more than any single factor alone. The option that includes moisture, light, and soil nutrients best captures this integrated pressure; choosing only one resource would miss how weeds jointly squeeze all three, amplifying the impact on the crop.

The main idea is that yield loss from weeds comes from competing for multiple essential resources at once. Weeds take up water, shade the crop to reduce intercepted light, and use soil nutrients, so the crop faces reduced moisture, less light for photosynthesis, and lower nutrient availability all at the same time. That combination explains why yield drops more than any single factor alone. The option that includes moisture, light, and soil nutrients best captures this integrated pressure; choosing only one resource would miss how weeds jointly squeeze all three, amplifying the impact on the crop.