The fertilization occurs in:

Explanation

In angiosperms (flowering plants), fertilization typically occurs within the ovule, specifically within a structure called the embryo sac. The embryo sac is located within the ovule and contains the female gametophyte, which includes the egg cell. During fertilization, pollen grains land on the stigma and then germinate, forming pollen tubes. These pollen tubes grow down through the style of the pistil and reach the ovule. Once the pollen tube reaches the embryo sac, it delivers the sperm cells, leading to fertilization. This process results in the fusion of one sperm cell with the egg cell, forming a zygote, and another sperm cell with the central cell of the embryo sac, forming endosperm, which provides nourishment to the developing embryo.