The Question is from neet-botany cell-biology , and it was created by the author D VINOD

Question

Cell Theory was propounded in 1838 &ndash; 39 by

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Cell Theory
	**Related Topics**: History of Biology, Cell Biology
	**Prerequisites**: Basic understanding of cell biology and its history.
## SOLUTION PATHWAY
**Given Information**:
	The question asks about the originators of the Cell Theory in 1838-39.
**Method & Steps**:
	1. Recall the scientists associated with the development of the Cell Theory.
		Reasoning: The Cell Theory is a fundamental principle in biology that states that all living organisms are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells.
	2. Identify the scientists who proposed the theory in the given timeframe (1838-39).
		Working: Matthias Schleiden, a botanist, proposed the idea that all plants are made of cells in 1838. Theodor Schwann, a zoologist, extended this idea to animals in 1839.  Together, their work formed the basis of the Cell Theory.
	3. Rudolf Virchow later added the third tenet to the cell theory, 'Omnis cellula e cellula' ('All cells come from cells'), in 1855, but this is beyond the timeframe of the question.
		Result: Schleiden and Schwann are credited with proposing the Cell Theory in 1838-39.
		Verification: This information can be verified in standard biology textbooks and scientific literature.
## OPTION ANALYSIS
[A] :x: Robert Hooke (discovered cells in 1665) and Anton van Leeuwenhoek (observed microorganisms) contributed to early microscopy but not the Cell Theory itself.
[B] ✓: Schleiden and Schwann proposed the Cell Theory in 1838-39.
[C] :x: Robert Brown discovered the nucleus, and Rudolf Virchow contributed the idea that all cells come from pre-existing cells, but neither of these individuals solely propounded the original Cell Theory.
[D] :x: Louis Pasteur is known for his work on germ theory and pasteurization, while Gregor Mendel is known for his work on genetics. They are not associated with the Cell Theory.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing the discovery of cells with the development of the Cell Theory:  Robert Hooke's observation of cells was a crucial precursor, but the Cell Theory itself explains the broader implications of cells as the fundamental units of life.
		2. Misattributing Virchow's contribution: While Virchow completed the Cell Theory, the question specifically asks about its origin in 1838-39.
	**Quick Tips**:
		1. Remember 'SS' for Schleiden and Schwann and 'Cells'.
		2. Visualize the timeline: Hooke and Leeuwenhoek (early microscopy) -> Schleiden and Schwann (Cell Theory) -> Virchow (completion of Cell Theory).

D VINOD · Answer

Robert Hooke and Anton van Leeuwenhoek

D VINOD · Answer

The correct Option is "Schleiden and Schwann"

D VINOD · Answer

Robert Brown and Rudolf Virchow

D VINOD · Answer

Louis Pasteur and Gregor Mendel

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