The discovery of nucleus in the cell was discovered in ________.

The discovery of the nucleus in the cell is credited to the Scottish botanist Robert Brown in 1831. While examining plant cells under a microscope, Brown noticed a small, dark region in the center of the cell, which he named the "nucleus." This discovery was a crucial milestone in the understanding of the structure and function of cells, as the nucleus is responsible for controlling the cell's activities and storing its genetic material. Therefore, the answer to the given question is Robert Brown, he discovered the nucleus in the cell in the year 1831.