The cell theory in its currently accepted form was finalised by
ASchwann alone, working on animal tissues in 1839
BSchleiden and Schwann, modified by Virchow in 1855
CRobert Hooke, in his Micrographia work of 1665
DSchleiden alone, working on plant tissues in 1838
Answer & Solution
Correct answer: B. Schleiden and Schwann, modified by Virchow in 1855
Schleiden (1838) and Schwann (1839) jointly proposed the cell theory. Virchow (1855) added the third tenet (Omnis cellula-e cellula — every cell arises from a pre-existing cell), giving cell theory its final form.
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