a) Coulter
b) Gauge wheel
c) Jointer
d) Land wheel
Answer: c
Explanation: Jointer is a small irregular piece of metal having of a shape similar to an ordinary plough bottom. It looks like a miniature plough. The small furrow slice that is cut from left and upper side of the main furrow slice and is inverted so that all trashes on the top of the soil are completely turned down and buried under the right-hand corner of the furrow.
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