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Cell theory was formulated by
Schleiden (Botanist) + Schwann (Zoologist) = Cell Theory!
1. Matthias Schleiden (1838), a German botanist, examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant. 2. Theodor Schwann (1839), a British zoologist, studied different types of animal cells and reported that cells had a thin outer layer (plasma membrane). He also concluded that the presence of a cell wall is a unique character of plant cells. 3. Based on these unified observations, Schleiden and Schwann jointly formulated the Cell Theory: all living organisms are composed of cells and products of cells.
1. Robert Brown (1831): Discovered and named the cell nucleus. 2. Singer and Nicolson (1972): Proposed the Fluid Mosaic Model of the cell membrane. 3. Antonie van Leeuwenhoek (1674): First saw and described live cells (bacteria, protozoa, sperm) under a simple microscope.
Cell theory was formulated by Schleiden and Schwann.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Exact historical and scientific attribution matching NCERT Cell Biology.
Incorrect. Robert Brown discovered the cell nucleus in 1831.
Incorrect. Singer and Nicolson proposed the fluid mosaic model of biological membranes in 1972.
Incorrect. Leeuwenhoek first observed live micro-organisms under a microscope.
Schleiden and Schwann FORMULATED cell theory, but did not explain how new cells arise. Rudolf Virchow (1855) later modified and completed it with "Omnis cellula-e cellula". The question asks who formulated it: Schleiden and Schwann.
"Schleiden and Schwann jointly formulated the cell theory stating that all living things consist of cells."
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