NTA Abhyas NEET2020BotanyCell - The Unit of LifePractice
Which of the following points were not explained by Schleiden and Schwann when they formulated their original cell theory?
Options
- AAll plants are composed of different kinds of cells which form the tissues of the plant
- BAnimal cells had a thin outer layer which is today known as the 'plasma membrane'
- CCells divide and new cells are formed from pre-existing cells
- DThe presence of cell wall is a unique character of the plant cells
Correct answer
C. Cells divide and new cells are formed from pre-existing cells
Step-by-step solution
Many plants were observed by Matthias Schleiden, a German botanist. He observed that all plants are made up of different types of cells that combine to form different types of tissues. Theodore Schwann, a British zoologist, observed that various types of animal cells have a thin outer layer. It is called the plasma membrane today. He also concluded that the cell wall is a unique feature of plants. Later Rudolf Virchow added the concept of 'Omnis cellula-e cellula'. It means that cells divide and new cells are forme