endosperm

This term describes the specialized food-storage tissue in seeds, acting as a biological pantry for the plant embryo. It is typically composed of starch, proteins, and fats, ensuring the seedling has sufficient energy to grow before it can perform photosynthesis. In a botanical context, the endosperm is a triploid tissue in angiosperms, resulting from double fertilization. It is an uncountable noun when referring to the substance generally, but can be treated as countable when discussing different types or instances of endosperm across various species.