Which scientist said that all cells are formed from other cells?

• A. Pasteur
• B. Schwann
• C. Virchow
• D. Hooke

Answer: (C)

This question tests understanding of cell theory and the idea that new cells come from existing cells. Rudolf Virchow is the scientist who stated this principle, often summarized as “all cells come from pre-existing cells.” He added the crucial concept that each new cell arises from a cell that already exists, which ties together growth, development, and tissue repair in living organisms. Context: Hooke first described cells in plant tissue, Schwann helped expand the idea to animals, and Pasteur showed that life doesn’t appear spontaneously. But Virchow is the one who clearly expressed that every new cell starts from another cell, making this statement the key rule in cell theory.