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47-A-Maize
48-B-Soyabean
49-A-handle of the plough
50-A-combine
51-gather a crop is called harvesting whereas seperate grain typically with a flail or by the action of a revolving mechanism.
52-It means the removal or cutting down of unwanted plants or weeds. It is necessary because they affect the growth of the plant and also nutrients supplied to the soil.
53-plough is used for farming and cultivation of soil preparation of sowing. Whereas hoe is a hand tool used by small farmers and vegetational crops.
54-They are collection of principles to apply for farm production to get agricultural products.
55-It means blow a current of air through
(grain) in order to remove the chaff.
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