Question

In view of the current status of our knowledge about the cell structure, which of the following statement(s) about cell theory is/are correct?
(i) The cell theory does not hold good since all living organisms are not cellular in organisation.
(ii) The cell theory in its modified form means that all living objects are composed of cells capable of reproduction.
(iii) The cell theory means that all living objects consist of cells, whether reproducing or not.
(iv) The cell theory needed modification due to the discovery of sub-cellular structures such as chloroplasts and mitochondria.

• A. (i) and (ii)
• B. (i), (ii) and (iii)
• C. Only (i)
• D. (ii) and (iii)

Answer 1

Answer: (C)

The cell theory is one of the basic principles of biology. Credit for the formulation of this theory is given to German scientists Theodor Schwann, Matthias Schleiden and Rudolph Virchow.
The cell theory states-

1) All living organisms are composed of cells. They may be unicellular or multicellular.
2) Cells arise from pre-existing cells.
3) All living organism like virus are not formed by cells.