Which of the following is a multicellular mass that nourishes the embryo until it becomes a self-supporting seedling?

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The endosperm is a tissue produced inside the seeds of most flowering plants following fertilization. It serves as a source of nutrients for the developing embryo and ultimately functions as a food reserve for the germinating seedling. The endosperm can be either triploid (containing three sets of chromosomes) or haploid (containing one set of chromosomes), depending on the mode of seed development. In many species, the endosperm becomes the major tissue of the mature seed, while in others, it is completely absorbed during embryonic development.

Which of the Following Is a Multicellular Mass That Nourishes