Question

What are weed ? Give example for the same how does the presences of these plants affect the crop yieds

Answer 1

Weeds are unwanted plants grown in crops.

Weeds takes all nutrients from the soil that effects the crop yields

Answer 2

Weeds are the unwanted plants grow in agricultural land.
The nutrition of main crop is taken by weeds so there is a problem in nutrition in main crop
To remove weeds there are many pestisides. Herbicides is the best.
It affects the main crop and major and micro nutrient is taken by weed