Which of the following statement is not true about weeds?

The statement that is not true about weeds is: "all weeds are grasses". Explanation: Weeds are any unwanted plants that grow in an area where they are not desired. While some weeds may belong to the grass family, not all weeds are grasses. Weeds can belong to various families, including but not limited to, Asteraceae (e.g. ragweed), Fabaceae (e.g. clover), and Solanaceae (e.g. nightshade). Weeds can cause significant damage to crops by competing with them for resources such as nutrients, water, and sunlight. Some weeds can also be parasitic on crop plants, meaning they attach to the crop and derive their nutrients from the crop. Weeds can also harbor crop diseases, making it harder for crops to grow and reducing crop yields. Additionally, weeds can reduce the nutritional value of pastures by taking up nutrients that would otherwise be used by desirable forage species.