Is the grain and seed of rice the same thing? What parts does a seed consist of?

The grain of rice is also called grain, and it is called caryopsis in botany. It includes glume, pericarp, seed coat, aleurone layer, endosperm and embryo from outside to inside. Accurately speaking, rice seeds refer to the seed coat and its parts after the glume and pericarp are removed, but in agricultural production, grains are often used as the object of sowing and harvesting, and it is impossible to separate the pericarp from the seed coat in practical operation. So rice seeds and grains can be said to be the same thing.

Glumes include inner glume (palea) and outer glume (lemma), and some varieties have long or short awns on the outer glume. The existence, length and color of awn are one of the basis for identifying rice varieties.

After the husk is removed, it is the fruit of rice-brown rice. Brown rice is 98% endosperm. Endosperm is rich in starch and a small amount of protein and fat, which is the main part of human consumption and the source of nutrition for the early growth of seedlings.

Embryo is located at the base of rice ventral surface, including embryo, hypocotyl, radicle, scutellum (cotyledon) and so on, which is the embryo body that develops into seedlings. When seeds germinate, radicle grows downward to form seed roots, and germ grows upward to form aerial parts of seedlings.