Question

Protoplasm was first observed by
A) Dujardin
B) Purkinje
C) Von Mohl
D) Corti

Answer 1

Hint: Protoplasm is the living part of the cell, which comprises different cellular organelles. Cell wall contains a jelly-like, colourless, viscous living substance known as protoplasm. The cytoplasm is the primary component of protoplasm, which is found between the cell membrane and the cell nucleus in a eukaryotic cell.

Complete answer:
The term ‘protoplasm’ was first proposed in the year 1835. It is called the primary substance because it is responsible for many living processes. Dujardin (April 5, 1802 – April 8, 1860) is a French biologist and cytologist who is known for his studies in the classification of protozoans and invertebrates.
In the year 1835, The Dujardin first discovered the protoplasm and he was named as “sarcode”.J.E. Purkinje (1839) – first introduced/coined the term 'Protoplasm'.In eukaryotic cells the protoplasm is enclosed by the cell nucleus is called the cytoplasm, and that inside the nucleus as the nucleoplasm.

So option A is the correct answer.

Additional information:
In the cell, a cytoplasm plays an important role in maintaining the environment of the cells. It also maintains the shape of cells and also stores substances needed by the organelle. The nucleus is the second constituent of the protoplasm, which reserves the genetic information of an organism. We can also find Ribosomes in the nucleus, which is very much important or essential for the production of proteins in the cell. Prokaryotes contain a nucleoid instead of a nucleus where all the genetic information is found.

Note:
Some important points to remember:
> Dujardin first observed the Protoplasm.
> He is a French biologist and cytologist.
> He also discovered a formless life structure that he named sarcode but which we called today as protoplasm.
> His main focus of the research was protozoans and other invertebrates.