Cell Theory - Schleiden, Schwann, Virchow - UNSOLVED PRACTICE SET
Chapter: The Fundamental Unit of Life | Topic: Cell Theory Schleiden Schwann Virchow
CELL THEORY - SCHLEIDEN, SCHWANN, VIRCHOW - UNSOLVED PRACTICE SET
Topic: Cell Theory Schleiden Schwann Virchow
Multiple Choice Questions
Q1. Who proposed that all plants are composed of cells?
- Theodor Schwann
- Matthias Schleiden
- Rudolf Virchow
- Robert Hooke
Q2. Theodor Schwann extended the cell theory to animals. In which year did he propose that all animals are composed of cells?
- 1838
- 1839
- 1855
- 1858
Q3. Rudolf Virchow modified the cell theory by stating that:
- All cells are identical in structure
- All cells arise from pre-existing cells
- All cells contain a nucleus
- All cells are surrounded by a cell wall
Q4. Which of the following is NOT a postulate of the classical cell theory?
- All living organisms are composed of cells
- The cell is the basic unit of life
- All cells contain DNA
- All cells arise from pre-existing cells
Q5. Schleiden and Schwann's cell theory had a flaw regarding cell origin. They believed that cells could arise from:
- Pre-existing cells only
- Non-living matter through spontaneous generation
- Cell division only
- Cytoplasmic division
Short Answer Questions
Q6. State the three main postulates of the cell theory as proposed by Schleiden and Schwann.
Q7. What modification did Rudolf Virchow make to the cell theory, and why was it important?
Q8. Explain why the statement "Omnis cellula e cellula" is significant in the history of cell biology.
Q9. Compare the contributions of Schleiden and Schwann to the cell theory. What type of organisms did each scientist study?
Long Answer Questions
Q10. Describe the historical development of the cell theory from Robert Hooke to Rudolf Virchow. How did each scientist contribute to our understanding of cells?
Q11. The cell theory has some exceptions. Discuss any THREE exceptions to the classical cell theory with examples.
APPLICATION / ANALYSIS
Q12. A biology teacher asks students to evaluate the following statement: "Virchow's modification of the cell theory was more important than Schleiden and Schwann's original postulates."
(a) Do you agree or disagree with this statement? Give reasons.
(b) How did Virchow's idea challenge the then-popular theory of spontaneous generation?
Q13. In a classroom debate, one student argues: "If Schleiden and Schwann had studied both plants and animals together, the cell theory would have been complete from the beginning."
(a) Evaluate this statement critically.
(b) Why do you think scientific discoveries often happen in stages rather than all at once?