a) Ploughing
b) Winnowing
c) Threshing
d) Harrowing
Answer: a
Explanation: The main implement for primary tillage is plough used for ploughing operations. Ploughing is the primary tillage operation, which is performed to cut, brake and invert the soil partially or completely. Ploughing essentially means operating the upper crust of the soil, breaking the clos and making the soil suitable for sowing seeds.
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