Gymnosperms and angiosperms are both types of plants; but the main difference between them is that gymnosperms are plants with “naked seeds,” and angiosperms have seeds that are protected inside ovaries (as pictured on the left). Angiosperms are also classified as either monocots or dicots, which means that if one were to cut a cross section of a seed, they would either see one or two cotyledons (pictured below on the right). One way to tell the difference between a monocot and a dicot without opening the seed would be to wait until it sprouted; a dicot first sprout will typically have two small leaves at the top, and a monocot sprout will just be a strand with a nub at the end, no leaves.
Gymnosperms have seeds that are on special sporophylls, which are leaves that bear sporangia. (A sporangium is a spore-bearing plant.) Gymnosperm seeds often form cone shapes. Angiosperms are seed-bearing plants that produce flowers and fruits, and they make up about 90% of all plant species. One huge difference in their life cycles is that angiosperms use a technique of double pollination. This is done when the generative cell divides into two haploid sperm cells, and the pollen tube forms from the tube cell. One sperm cell will fertilize the egg, and the other sperm cell with form an endosperm with the polar nuclei to serve as a food source for the seed.