state the modification added to the cell theory for 9th ncert
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CBSEBiologyGrade 9Cell
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The cell theory states that
A. All cells have nuclei.
B. All cells are totipotent.
C. Cells reproduce by mitosis.
D. Cells are the basic structural units of living beings.
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Hint: The cell theory clearly suggests the fundamentals of biology and therefore it applies to each living organism and is considered to be universally true.
Complete answer: Cell theory was put forward by a famous German botanist- Matthias Schleiden and an English zoologist- Theodor Schwann in the year 1839.
It has the following propositions:
1) Cells are the basic unit of life and they are therefore considered to be the building blocks of living organisms.
2) All the living organisms are made up of cells; a cell is the basic structural and functional unit of each living organism.
3) All cells are produced by cells that already pre-exist.
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