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a
Theodore Schwann, a German botanist, examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant.
b
Schwann, a zoologist studied different types of animal cells and reported that cells had a thin outer layer which is today known as the ‘plasma membrane’.
c
Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells.
d
Schleiden and Schwann together formulated the cell theory.
answer is A.
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Detailed Solution
In 1838, Matthias Schleiden, a German botanist, examined a large number of plants and observed that all plants are composed of different kinds of cells which form the tissues of the plant.Theodore Schwann (1839), a Zoologist, studied different types of animal cells and reported that cells had a thin outer layer which is today known as the ‘plasma membrane’.Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells.Schleiden and Schwann together formulated the cell theory.