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1. Preparation of soil - Soil preparation is necessary before growing a crop. It involves
the soil. 
2. Sowing - The process of
into the soil is called sowing. The tool used traditionally for sowing seeds is funnel-shaped.
3. Weeding - Some
grow along with crop and these unwanted plants are called weeds.
4. Threshing - The process of
seeds from the chaff is called threshing.
Answer variants:
putting seeds
undesirable plants
tilling and loosening
separating the grain