Q. What is/are true for the cell theory?
- The cell theory states that all the plants and animals are composed of cells and that the cell is the basic unit of life.
- All cells arise from pre-existing cells.
Select the correct answer from the codes given below:
Answer:
Both 1 and 2
Notes: The cell theory - that all the plants and animals are composed of cells and that the cell is the basic unit of life, was presented by two biologists, Schleiden (1838) and Schwann (1839). The cell theory was further expanded by Virchow (1855) by suggesting that all cells arise from pre-existing cells. With the discovery of the electron microscope in 1940, it was possible to observe and understand the complex structure of the cell and its various organelles.