In botanists / structural, grains and seeds is not different from one another, both from the zygote, is derived from the ovule, and has the same structure.
Functionally seeds with seeds have a different understanding. Seeds are crops that are used for the purpose of consumption or processed as industrial raw materials. While the seeds are seeds of plants which are produced for the purpose grown / cultivated back.
Based on such understanding, the seed has a function agronomy or a component of agronomy, therefore the seed belongs to the field / scope of agronomy. In the development of farming, seed is one of the means to be able to generate the highest possible production. Because the seed is a means of production, the seed must be of high quality (quality physiological, genetic and physical) of the type that is superior. As a component of agronomy, seed is more oriented to the application of scientific principles, therefore, is more science and technology.
Here are some vegetable seeds that you can order to get to know the details of the seed and you just have to click on the type of seed that you choose.
and hopefully useful.