Hint: A cytologist is a person who studies the cell structure and the abnormality in them. The cell has various components present in it. The nucleoplasm usually contains the genetic material of the cell. Division of cells also leads to the division of the nucleoplasm.
Edward A. Strasburger is a famous cytologist who is known for the discovery of cell division and used the term ‘nucleoplasm’ and ‘cytoplasm’. He is a known German professor and was a famous botanist of 19 century. In gymnosperms and angiosperms, he was the first one to provide an accurate explanation of the embryonic sac. Along with demonstrating double fertilization in angiosperms. One of the modern rules of plant cytology came into being as ‘new nuclei of a new cell can only arise by the division of the other nuclei’ and the terms cytoplasm and nucleoplasm have then emerged. He also worked on the movement of the tree sap and discovered that the process was physical and not physiological. He was awarded the Darwin-Wallace Medal in 1908.
So, the answer is ‘Both assertion and reason are correct and the reason is the correct explanation for assertion’.
Note: Edward A. Strasburger is known for his discovery of the cell division in which he found out that the new cell gets the nucleoplasm from the division of the pre-existing nucleoplasm of the parent cell. He coined the terms cytoplasm and nucleoplasm. He is also known for his work on the chromosome movement during the cell division in the plant cells.