GENERAL KNOWLEDGE

Detailed explanation-1: -Harrows were initially drawn by draft animals like horses, mules, oxen, bulls or in some cases by manual laborers. In modern times these are drawn by power sources such as tractors mounted implements. Therefore, the correct answer is both tractors and bullocks which is option (D).

Detailed explanation-2: -Ringness, Ole (1843–1872). Ole Ringness, inventor of the disc plow and disc harrow, was born in Løiten, Norway, on October 14, 1843, to Jens Olsen and Kari Jensdatter (Halstenhav) Ringness, early Norwegian settlers in Texas.

Detailed explanation-3: -The main difference between a plough and a harrow is that the harrow is lighter and won’t penetrate as deeply. Its primary role is cultivating loose soil suitable for weed control and creating a seedbed if the ground is already soft.