Which of the following is not correct? (a) Robert Brown discovered the cell. (b) Schleiden and Schwann formulated the cell theory. (c) Virchow explained that cells are formed from pre-existing cells. (d) A unicellular organism carries out its life activities within a single cell.
Which of the following is not correct? (a) Robert Brown discovered the cell. (b) Schleiden and Schwann formulated the cell theory. (c) Virchow explained that cells are formed from pre-existing cells. (d) A unicellular organism carries out its life activities within a single cell.
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Statement (a) Robert Brown discovered the cell is not correct
The term cell was first coined by Robert Hooke in 1665 when he described “cellulae” in cork under a microscope
Robert Brown’s landmark contribution in 1831 was the recognition and naming of the cell nucleus, not the discovery of the cell itself
Statement (b) Schleiden and Schwann formulated the cell theory is correct
In 1838 Matthias Schleiden concluded that all plant tissues are composed of cells
In 1839 Theodor Schwann extended this principle to animals, together founding the unified cell theory
Statement (c) Virchow explained that cells are formed from pre-existing cells is correct
In 1855 Rudolf Virchow asserted omnis cellula ex cellula, establishing that new cells arise only by division of existing cells
Statement (d) A unicellular organism carries out its life activities within a single cell is correct
Unicellular organisms such as bacteria and protozoa perform all metabolic, reproductive, and homeostatic functions within one cell
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