Question

Who discovered nucleus?
A. Schleiden in 1931
B. Robert Brown in 1831
C. Robert Hooke in 1941
D. Altman in 1931

Answer 1

Hint: Nucleus is a double membrane-covered, protoplasmic body that contains hereditary information. It is found in eukaryotic cells.

Complete Answer:
For this question, the first thing that we will do is we will find out the contribution of different scientists in the options given.
- Option a: Schleiden and Theodor Schwann formulated cell theory in 1839. Therefore, this is an incorrect option.

- Option b: The nucleus was discovered by Robert Brown in 1831. He performed the grafting experiments on Acetabularia, the help of Hammerling in 1953, and proved that the nucleus is a storehouse of hereditary information. Therefore, this is the correct option.
Robert Brown discovered the nucleus while studying the process of fertilization in Orchids and Asclepiads. He named the nucleus and it has been known as that ever since.

- Option c: Robert Hooke was a natural philosopher. One of his most notable discoveries came in 1665 when he looked at a sliver of cork through a microscope lens and discovered cells. He observed the small compartments and banned it as “cellulae”, which was later known as a cell. Therefore, this is an incorrect option.

- Option d: Nucleus was discovered by Robert Brown in 1831. Therefore, this is an incorrect option.

Thus, the correct option is B) Robert Brown in 1831.

Note: Robert Brown was a botanist from Scotland who was a pioneer in microscopy. He was among the first botanists to describe the nucleus of cells while he also discovered Brownian motion.