Question

Cell theory was proposed by: ____.

• A. Watson and Crick
• B. Schleiden and Schwann
• C. Darwin
• D. Mendel

Hint:

To connect the names to their fields: Schleiden sounds like "slide" (which you use to look at plant tissues under a microscope), and Schwann sounds like "swan" (an animal, fitting the zoologist).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Cell theory is a foundational principle of biology that defines the cellular nature of all living structures and organisms.

Step 2: Detailed Explanation:
The Cell Theory was jointly formulated by two German scientists:
• Matthias Schleiden (1838): A German botanist who concluded that all plants are composed of different kinds of cells.
• Theodore Schwann (1839): A German zoologist who studied different types of animal cells and concluded that all animals are made of cells. He also noted that the presence of a cell wall is a unique character of plant cells. Rudolf Virchow later expanded the theory in 1855 by adding the concept of “Omnis cellula-e cellula” (all cells arise from pre-existing cells).

Step 3: Final Answer:
Cell theory was proposed by Schleiden and Schwann.