Explanation

(a) Implement I is Mould board plough/ plow while implement lI is Disc plough /plow.

(b) Important parts of each are:

• I - Coultier /vertical disc; shore / share point mould board: beam/frame; standard.
• II - Concave disc / disc: sledge / knife / scrapper, rotating hubs disk bearing bearing: spring: beam / frame, balancing disc / furrow wheel; beam cap; coupling point / hinge / linkage point, Standard

(c) Function of each part listed; 

I;

• Coulter makes vertical cuts/furrows;
• Share makes horizontal cuts/uproot weeds;
• Mould board carries the soil, inverts the weeds and exposes the roots of the weeds;
• Standard bears the mouldboard and Share
• Beam/Frame carries the plough and other components / proves additional weight for greater depth

II;

• Concave disc rotates and makes vertical cuts / horizontal cuts as the tractor moves forward / inverts the soil.
• Scrapper /knife/sledge helps to remove soils that cling to the disc.
• Hub helps the dick to overcome obstacles like rocks. outcrops, stumps etc;  
• Frame / Bame holds discs in position and bears additional weight for greater depth
• Furrow wheel /balancing disc - balances the plough / keeps plough from toppling:
• Coupling point provides point of attachment to the tractor;
• Standard carries the disc and other associated parts.

(d) Advantages of Disc plough (ii) are:

• It overcomes obstacles like stones and stumps more readily.
• lt can be used in more difficult soils, e.g. clay or sticky soils.

Disadvantages of Mould board plough are

• It loses its share point when in contact with an obstruction.
• It predisposes soil to erosion / soil compaction takes place when used often.

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