Germinating seeds can be extremely fun and identifying parts can be very easy. I recently planted some herb seeds and saw a small white part growing.
I noticed that it was the root because when seeds germinate the root comes first to find water for the growing plant. As the plant grows, the shoot emerges. The shoot then photosynthesizes creating food for the plant.
Seeds have three main parts: the seed coat, the embryo, and the food storage. The seed coat protects the seed for danger and falls off when the seed is in proper growing conditions. The embryo has one root system and another upward growing shoot. Cotyledons are ear shaped seed leafs. When a seed sprouts, cotyledons are the first leaf or leaves. Seeds can be either monocots, which have one cotyledon, or dicots, which have two cotyledons. Food storage includes endosperm, cotyledon, and perisperm.