Question

how embryo gets its nutrition in plants

Answer 1

If “embryo seed” refers to a human or other placental animal, the embryo gets food from the placenta, an organ that grows from the embryo against the inner surface of the womb, and is connected to the embryo via the umbilical cord. In egg-laying animals, the food supply is inside the egg, but an organ analogous to the placenta grows on the inner surface of the egg to handle respiration.