Question

In 1831, was a remarkable period as it was marked by the discovery of
A. Cell
B. Dictyosome
C. Nucleus
D. Nucleolus

Answer 1

Hint: The cell is the smallest unit of life. Dictyosome is another name for the Golgi body in plants. it was discovered by Camillo Golgi. The nucleus is also known as the controlling center of the cell. Moreover, the nucleolus is the granular, membrane-less structure that is the factory of ribosomes inside the nucleus.

Complete answer: Let us look at all the options that are given to us one by one.
Cell – The cell was first discovered by Robert Hooke. He discovered it in the year 1665 in the dead cork. He wrote about them in his book Micrographia. The living cells were first observed by Antoine van Leeuwenhoek as bacterial cells in the year 1683.
Dictyosome – The Golgi apparatus or the Golgi body is known as the Dictyosome in plants. The Golgi body is formed by the modification of the Endoplasmic Reticulum. The Golgi body was first observed by Camillo Golgi in the year 1897.
Nucleus – The nucleus was discovered by Sir Antoine van Leeuwenhoek in the year 1831 in the root cells of the Orchid plant. The nucleus is known as the Controlling center of the cell or the Master of the cell.
Nucleolus – The nucleolus was discovered in the year 1830 by a technique known as bright-field microscopy. Its detailed structure was obtained in a study by the scientists John Gurdon and Donald Brown in the year 1964.
Thus, based on the above information, we can conclude that 1831, was a remarkable period as it was marked by the discovery of the Nucleus.
Hence, the correct answer is option (C).

Note: The first cell organelle that was discovered was the nucleus. Antoine Van Leeuwenhoek observed the lumen and the nucleus in the red blood cells of the salmon during his lifetime from 1632 to 1723. Later in 1804, Franz Bauer described its structure. However, in 1831 the Scottish Botanist, Robert Brown discovered the nucleus which he called the areola. He did this discovery in the root cells of the Orchids.