Conifers (gymnosperms) and grasses (angiosperms) differ primarily in the timing and nature of their endosperm development:Conifers (Gymnosperms): The endosperm is formed before fertilization. It is derived directly from the megaspore (the female gametophyte) and is therefore a haploid (n) tissue.Grasses (Angiosperms): The endosperm is formed after fertilization as a result of "double fertilization". Specifically, it results from the triple fusion of a male gamete with two polar nuclei, making it a triploid (3n) tissue.

──────────────────────────────────────────────────────────────────────────────────────────