(a) Name the tool used with a tractor for

(a) The tool used with a tractor for sowing seeds in a field at uniform distances is seed drill. Before the introduction of seed drill, the process was manual.

(b) The advantages of seed drill are:

1. Seeds are sown at a uniform distance and depth to avoid over crowding.
2. After sowing, seeds are covered by soil which prevent them from being eaten by birds.
3.  It saves time and labour.
4. Improves the ratio of crop yield by as much as nine times.