GCEAgricultural ScienceFarm Machinery and Tools2022

Which of the following statements correctly distinguishes a mould-board plough from a disc plough?

AA mould-board plough uses rotating concave discs, while a disc plough uses a curved metal board to invert the soil
BA mould-board plough uses a curved metal board to invert the soil, while a disc plough uses rotating concave discsCORRECT
CBoth ploughs use rotating discs but differ only in the depth of tillage
DA mould-board plough is tractor-mounted, while a disc plough is always animal-drawn
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Toaster Teacher
Why the answer is B, and why the others tempt you.
The mould-board plough has a curved metal board (mould board) that cuts, lifts, and inverts the soil slice, while the disc plough uses large concave rotating discs to cut and turn the soil. Option A reverses the descriptions, option C is factually wrong, and option D is incorrect because both can be tractor-mounted.
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