Morphological characteristics of sunflower seeds

Sunflower seeds are composed of a skin (shell) and a seed, with the seed consisting of a seed coat, two cotyledons, and an embryo. The fruit skin is divided into three layers, with a membranous outer skin and short hairs on top; The mesocarp is leathery, hard and thick; The endocarp is fluffy. The seed coat contains two large cotyledons, as well as the embryonic root, embryonic stem, and embryonic bud, without endosperm. The embryonic root, embryonic stem, and embryonic bud are located at the tip of the seed. The seed coat consists of two layers, the outer epidermis and the inner epidermis, and is a white thin film