Which of the following implements is used for primary tillage?

The implement used for primary tillage is a plough. Primary tillage is the first stage of soil cultivation where the soil is broken up and turned over to a significant depth to prepare it for planting. A plough is a farming tool with one or more blades that are used to cut, lift and turn over the soil in preparation for planting. The plough blade is designed to penetrate the soil and cut a furrow, which is then turned over to expose the nutrient-rich soil below the surface. This process helps to loosen and aerate the soil, which makes it easier for plants to take root and grow. On the other hand, cultivators, harrows, and ridgers are all secondary tillage tools that are used after primary tillage to further prepare the soil for planting. Cultivators are used to remove weeds and break up the soil surface to improve water penetration, while harrows are used to level the soil and break up clumps of soil. Ridgers are used to create ridges or furrows in the soil to plant crops. In conclusion, a plough is used for primary tillage, which is the first stage of soil cultivation where the soil is broken up and turned over to prepare it for planting. Other tools like cultivators, harrows, and ridgers are used for secondary tillage to further prepare the soil for planting.