Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
Multicellular organisms have division of labour. Explain.
How are viroids different from viruses?
Describe the structure of the following with the help of labelled diagrams.
(i) Nucleus
(ii) Centrosome
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