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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
Who discovered cells and how?
Explain why chloroplasts are found only in plant cells?
What was the contribution of the following to our knowledge of cells?
Schleiden
Expand - SER
Fill in the blank with a suitable word:
DNA is an abbreviated form of ______.
Fill in the blank with a suitable word:
______ controls all the metabolic activities of the cell.
Match the items in column A with the appropriate items in column B:
| column A | column B |
| 1. Platform or workplace for the synthesis of proteins | a. Golgi complex |
| 2. A powerhouse of cells | b. Ribosomes |
| 3. Help in the formation of cell plate during cell division | c. Chloroplast |
| 4. Site for photosynthesis | d. Mitochondria |
| 5. Control tower of cell | e. Chromosomes |
| 6. A structure bearing genes | f. Nucleus |
What is difference between us?
Prokaryotic cell and eukaryotic cell.
Answer the following question.
Who discovered cells, and how?
