Question

Robert Brown discovered
A. Cell Wall
B. Mitochondria
C. Nucleolus
D. Nucleus

Answer 1

Hint: Cell wall, Mitochondria, Nucleolus and Nucleus , all are the parts of a cell. Cell is the basic fundamental unit of life, cells are also called as building blocks of life.

Complete Answer:
- Robert Brown was the Scottish botanist. He made many important contributions after the advancement of microscopes. He was the one who discovered the Nucleus of the cell.
- Nucleus is a membrane bound organelle that contain genetic material i.e. DNA (deoxyribo nucleic acid).
- DNA is the hereditary material which passes from parents to the offspring.
- DNA carries genetic information along with it which is responsible for the similar appearance of the offspring to their parents.

Additional information:
- Cell Wall: Cell Wall is discovered by Robert Hooke in 1665. Cell wall is the structure that is present only in the plant cells. It is a layer which is protective in nature and covers the cell membrane. Cell Wall can be tough, flexible and sometimes rigid.
- Mitochondria: Mitochondria is discovered by Anton von Koliker but it was named by Carl Benda. Mitochondria is also called the powerhouse of the cell. It is a place where the aerobic respiration of food takes place inside a cell in order to yield energy in the form of ATP ( Adenosine triphosphate).
- Nucleolus: Nucleolus was discovered by Max L. Birnstiel. Nucleolus is the structure that is present inside the nucleus of the cell. The nucleolus is composed of RNA (Ribonucleic acid) and proteins.

Hence, option D is the correct option for this question.

Note: Cell was firstly discovered by Robert Hooke. Robert Hooke was working with his magnifying device. He cut a thin cline of cork and observed it under his magnifying device. He observed a honeycomb like structure having different compartments. He then called these compartments as cells.