10. (i) What are weeds?
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Weeds are unwanted plants. They grow with crops and compete for nutrients and water with main crop. So weeds are very harmful.
Life cycle
Annuals - Annual weeds complete their life cycle in one year or less. Most reproduce only by seeds. ...
Biennials - Weeds that live more than one year but not more than two years.
Perennials - Perennial weeds are weeds that live more than two years.
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