One function of a plant's seed is to (1) perform photosynthesis (2) provide food for early development (3) decompose dead organisms or (4) reproduce sexually?

Answer: (2) Provide food for early development

Some functions of seeds include protecting the embryo, providing food, and allowing for easy dispersal. A tissue in seeds stores carbohydrates, fats, and proteins that provide food for a young plant, and this tissue can be found in the endosperm, perisperm, and/or cotyledons of the seed.