Option 1: Ovary and ovary wall - This option is incorrect. While the ovary and ovary wall are involved in the formation of seeds, they are not components of the seeds themselves.

Option 2: Embryo, food reserves, and coat - This option is correct. The seeds of flowering plants consist of three main components: the embryo, which is the immature plant; food reserves, which provide nutrients for the embryo to grow; and the coat, which protects the embryo and food reserves.

Option 3: Cotyledons - This option is partially correct. Cotyledons are actually part of the embryo and play a role in storing and providing nutrients to the growing plant. So, while cotyledons are present in seeds, they are not the only component.

Option 4: Zygotes - This option is incorrect. Zygotes are the result of fertilization and develop into embryos, which are one of the components of seeds. However, they are not the entirety of the seed.

To summarize, the correct answer is option 2, as the seeds of flowering plants are composed of the embryo, food reserves, and coat.