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प्रश्न
Who proposed the Cell theory? Explain the main points of this theory.
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उत्तर
In 1839, M.J. Schleiden and T. Schwann proposed the cell theory. This was further expanded by Virchow in 1858.
The main features of the cell theory as known at present are:
(i) All living organisms are composed of cells. Hence cell is the structural unit of living organisms.
(ii) All cells arise from pre-existing cells of a similar kind by cell division.
(iii) The chemical composition and metabolism of all cells are basically alike.
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संबंधित प्रश्न
State the difference between eukaryotes and prokaryotes
Explain why chloroplasts are found only in plant cells?
A plant cell can be identified from an animal cell by the :
The cell organelle that helps in the respiration of the cell is :
Try to find the names of four cell organells hidden in this maze, (hint: The hidden words can appear horizontally or vertically; forwards or backward or even mixed up). Write them in the lines provided. For example : “NUCLEUS” in the last row, seven backward letters.
| A | J | F | B | H | E | M | O | E | L | O | U | C | A | V |
| H | V | L | E | U | C | O | P | L | A | S | T | N | O | E |
| C | H | R | O | M | O | P | L | A | S | T | X | T | E | R |
| S | U | E | L | C | U | N | W | P | L | A | S | T | I | D |
Fill in the blanks:
Organisms which are made up of a single cell are called ______ organisms.
What was the contribution of the following to our knowledge of cells?
Robert Hooke
What was the contribution of the following to our knowledge of cells?
Virchow
Name the different organelles in a cell?
Write about the contribution of Robert Hooke in cell biology.
