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प्रश्न
What is cell theory? Name the three scientists whose work led to the formulation of the cell theory.
उत्तर
Cell theory was given by Schleiden and Schwann in the year 1838-1839. It was refined further by Rudolf Virchow.
The main postulates of cell theory are:
- All living beings are made up of one or more cells.
- Cells are the basic structural and functional unit of all living beings.
- All cells are basically alike in chemical composition and metabolic processes.
- New cells arise by the division of pre-existing cells. (Rudolf Virchow)
APPEARS IN
संबंधित प्रश्न
Match the name of the organelle given in Column A with its function given in Column B.
| Column A (Organelle) | Column B (Function) | ||
| 1 | leucoplast | a | help in cell division |
| 2 | nucleus | b | transport of material |
| 3 | ribosomes | c | making food |
| 4 | mitochondria | d | digesting foreign bodies |
| 5 | endoplasmic reticulum | e | storage of starch and proteins |
| 6 | golgi bodies | f | making the cell turgid |
| 7 | chloroplast | g | making proteins |
| 8 | centrosome | h | controlling all the vital activities of a cell |
| 9 | vacuole | i | releasing energy |
| 10 | lysosomes | j | synthesis of cell wall in a plant cell |
What was the contribution of the following to our knowledge of cells?
Schwann
What is the function of the following?
Mitochondria
Give one main function of the following:
Chloroplast
What is a 'cell'?
Sketch and describe in your own words, the animal cell
Answer the following question.
Who discovered cells, and how?
Answer the following question.
Why is the cell called the structural and functional unit of life?
Under the microscope, Priya observes a cell that has a cell wall and distinct nucleus. The cell that she observed is
The Term “ cell” was coined by ______
