Step 1: What a seed drill does.
A seed drill drops seeds in neat continuous rows at an even depth and then covers them. It suits small seeds that grow close together.
Step 2: Match it to a crop.
Wheat has small seeds and grows in dense rows, so a seed drill fits it well. Maize needs a planter for wider spacing, sugarcane is planted by stem cuttings, and potato is planted by tubers.
Step 3: Choose the crop.
So the seed drill is used for wheat.
\[ \boxed{\text{Wheat}} \]