Concept:A disc plough is a tillage implement used to prepare land for planting, not a planting implement.
Explanation:The disc plough works on the field before sowing, cutting, lifting, and turning the soil over.
Its functional parts include the furrow wheel, coulter, and disc scraper, which help with depth control and cleaning of the disc.
A planter, however, is a separate machine used after land preparation to sow seeds or place seedlings in the soil.
Therefore, the planter is not a component of a disc plough.
Answer:A. Planter