What term describes noxious seeds not classified as agricultural or vegetable?

The term that best describes noxious seeds that are not classified as agricultural or vegetable is "Weed Seed." This designation typically encompasses undesirable plants that can harm crops, ecosystems, or agricultural practices, but do not fit into the agricultural or vegetable seed categories.

Understanding the terminology is essential in the field of seed regulation. Weed seeds are defined broadly and can include a variety of plant species that are invasive or detrimental to desirable crops. They may not have an economic value and often require management to prevent their spread.

In contrast, "Noxious Weed Seed" specifically refers to weed seeds that are recognized as harmful or detrimental. While this term is closely related, it implies a certain level of classification and acknowledgment of the specific harmful characteristics of these seeds.

The other options such as "Agricultural Seed" and "Seed Quality" refer to categories focused primarily on useful plant seeds and their purity or performance characteristics, making them unsuitable in describing seeds that are defined as noxious but not classified as agricultural or vegetable. Thus, "Weed Seed" is the appropriate term in this context.