Explanation

(a) The farm implement illustrated by the diagram is Planter, seed planter/precision seed drill. 

(b) Ways of functioning or operation;

• The implement is attached or coupled to a tractor and pushed by man or pulled by animal.
• As the planter moves, the furrow opener opens the soil/land
• The sprocket controls the seed plate or drops the seeds
• The furrow closer closes the furrow, the roller presses it up and the inter-row marker marks / indicates the planting distance

(c) Labelling and functions of the parts labelled:

• B - hole digger/furrow opener. Function: digs a hole in front into which the seed(s) will drop.
• C - seed hose /seed tube. Function: conducts or directs the seed from the base of the hopper into the hole dug.
• A - Seed hopper / seed box / seed container. Function: contains the seeds ( to be planted).
• D. furrow ( wheel) press/ roller. Function: Presses the soil to cover the seed dropped into the hole.

(d) Maintenance of planter:

• should only be used for the purpose for which it is meant,
• should be(dismantled) and washed/cleaned after Use 
• wash and dry after use,
• store under cool, dry environment;
• metal parts should be oiled/greased to prevent rusting,
• bolts and nuts should be tightened regularly;
• replace worn-out parts;
• Lubricate movable joints.

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