AP BIOLOGY

Detailed explanation-1: -Recognizing the importance of Robert Brown’s discovery of the cell nucleus, Schleiden argued that the nucleus, which he renamed the cytoblast, was an essential component of all plant cells. He believed that all higher plants were aggregates of cells. The cells that made up the plant led a double life.

Detailed explanation-2: -Schlieden investigated plants microscopically and conceived that plants were made up of recongnizable units, or cells. He thought plant growth came about through the production of new cells, which, he speculated, came from the nuclei of old cells.

Detailed explanation-3: -German scientists Theodore Schwann and Mattias Schleiden studied cells of animals and plants respectively. These scientists identified key differences between the two cell types and put forth the idea that cells were the fundamental units of both plants and animals.

Detailed explanation-4: -What did Matthias Jacob Schleiden contribute to the cell theory? Matthias Jacob Schleiden studied microscopic plant structures. In his studies, he observed that the different parts of the plant organism are composed of cells or derivatives of cells.

Detailed explanation-5: -The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made of cells.