Answer : Robert Brown discovered the nucleus in the cell in the year 1831. The nucleus is located in the eukaryotic cells. It is a double membrane that mainly covers the protoplasmic body, consisting of heredity information.
Robert Brown proved that the nucleus is mainly the storehouse of heredity information. He confirmed that by taking the help of the grafting experiments on Acetabularia in the year 1953. During that time, noticed the existence of the structure inside the orchid cells and many other plants. He is mainly famous for his description of cell nuclei and the Brownian motion.