Why do ova have a food store?

The main function of food stores within ova is to provide sustenance to the developing embryo or larva and to support its initial growth stages. As ova are released or are in transit to a suitable environment for development, the nutrients packed in the food stores ensure the embryo's survival and development. The food stores serve as a valuable source of energy, essential building blocks, and biochemical components necessary for cellular growth and differentiation. Different ova have varying food reserves depending on the species, with some having yolk granules, lipid droplets, or other types of nutrient-rich substances to sustain early embryonic development.