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CELL THEORY : 1. Matthias Schleiden, a German botanist observed that all plants are composed of different kinds of cells which form the tissues of the plant. 2. Theodore Schwann (1839), a British Zoologist, studied different types of animal cells and reported that cells had a thin outer layer (‘plasma membrane’). 3. Theodore Schwann also concluded that the presence of cell wall is a unique character of the plant cells. 4. Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells. Regarding 1,2,3 and 4:

( a ) 4 is incorrect but 1, 2 and 3 are correct
( b ) All are correct
( c ) 3 is incorrect; 1,2 and 4 are correct
( d ) 1 and 2 are correct but 3 and 4 are incorrect

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