Cell Theory and the Basic Unit of Life · NCERT Biology

In 1838, Matthias Schleiden, a German botanist, examined a large number of plants and concluded that:

  1. All animals are composed of cells.
  2. Cells arise only from pre-existing cells.
  3. All plant tissues are composed of cells.
  4. Plant cell walls are absent in animal cells.
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Correct answer: All plant tissues are composed of cells.

Schleiden's contribution to the cell theory was specifically focused on botany. He observed that all plant tissues are composed of cells, which was later integrated with Schwann's animal cell observations.

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