Question

Who first discovered nucleus in a cell in 1831?
A. Robert Hooke
B. Robert Brown
C. Altmann
D. Swanson

Answer 1

Hint:He is a Scottish botanist who also recognized the fundamental difference between the angiosperms and gymnosperms.

Complete answer:
To solve this question, first we should know about the nucleus. In cell biology, the nucleus is the large membrane-bound organelle containing the genetic information in the form of multiple linear DNA molecules organized into chromosome structures. The function of the nucleus is to function as the cell's control centre. That's because it contains the genetic material which codes the cell's vital functions. The nucleus is the organelle responsible for managing DNA integrity and regulating gene expression for controlling cellular activities like metabolism, growth, and reproduction.
Now, let us find the solution from the options-
-In 1831, Robert Brown discovered the cell nucleus.
- He is mainly remembered for his descriptions of the cell nuclei and the continuous motion in the solution of minute particles called Brownian motion.
- He enhanced the taxonomy of plants by establishing and identifying new families and genera.
- In 1831, while researching the fertilization processes of plants in the families of the Orchidaceae and Asclepiadaceae, he noted the existence of a structure within orchid cells, and so many other plants, that he called the cell's "nucleus."

Thus, the correct answer is option (B) Robert Brown.

Note:Students may confuse Robert Hooke and Robert Brown. The Scottish botanist Robert Brown was mainly known for his descriptions of cell nuclei. And the existing compound microscope was improved by Robert Hooke. He discovered Hooke's law i.e., the law of elasticity