Seed drill is the odd one in the given tools. Seed drill is a modern tool of cultivation, whereas, the other tools in the given list are very traditional and old methods of cultivation. Seed drill is used to sow seed at same distance and the cover it properly with soil. Plough is used for tilling, hoe is used to remove weeds, chain pump is used to irrigate the crops, and sickle is used to remove weeds.