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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Solution

(a) Robert Brown did not discover the cell.

The cell was discovered by Robert Hook in the year 1665 by using the microscope. Hooke actually observed the dead cell walls of plant cells (cork) as it appeared under the microscope and remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name.

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Similar questions

	Column A		Column B
(a)	discovery of the cell	(i)	Schleiden and Schwann
(b)	first description of cell nucleus	(ii)	Rudolf Virchow
(c)	formulation of cell theory	(iii)	Robert Hooke
(d)	every cell arises from a cell	(iv)	Robert Brown

Briefly give the contributions of the following scientists in formulating the cell theory

(a) Rudolf Virchow

(b) Schleiden and Schwann

Column I	Column II
(A) Leeuwenhoek	(i) First saw and described a living cell
(B) Robert Brown	(ii) Presence of cell wall is unique to plant cells
(C) Schleiden	(iii) Discovered the nucleus
(D) Schwann	(iv) All plants are composed of different kinds of cell

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