Question

what are weeds how do they pose a threat to crop plant​

Answer 1

Weeds (plants growing where they are not wanted) reduce crop yield, increase production cost, and may harbour insects and diseases that attack crop plants. Methods employed to control weeds include hand weeding, mechanical cultivation, application of chemicals acting as herbicides, and a combination

Answer 2

Weeds are the unwanted plants that grow on their own along with other crops.
They pose a threat for other crops in following ways:-
1. They use up sunlight and essential nutrients from the soil making difficult for useful crops to absorb those nutrients.
2. They use up high water due to which useful crops usually die.
3. Due to unwanted growth of weeds there isn’t adequate amount of space between two crops due to which crops don’t grow properly.