For what discovery was Jan Evangelista Purkinje known in 1839?

Coined the term protoplasm

The correct answer is Option (3)-Coined the term protoplasm

In 1839, Jan Evangelista Purkinje introduced the term "protoplasm" to describe the fluid substance within a cell. Protoplasm constitutes the living component of a cell, enclosed by a plasma membrane. It is a complex mixture of small molecules like ions, monosaccharides, and amino acids, along with macromolecules such as proteins, polysaccharides, and lipids. The plasma membrane, also known as the cell membrane, is a universal feature in all cells, serving as a barrier that separates the cell's interior from the external environment. The lipid bilayer is a fundamental structural element found in all cell membranes.