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111. What are the advantages of multicellularity?

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112. Describe disadvantages of multicellularity.

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113. What is compartmentalization ?

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114. Describe types of cells on the basis of nuclear membrane

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115. Define cell and name the one who discovered it.

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Cell theory was given by Schleiden, Schwann and Rudolf Virchow. The cell theory states that

(i) all living organisms are composed of cells and products of cells.

(ii) all cells arise from pre-existing cells.

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117. “The function of an organism is the sum result of the sum total of activities and interactions of constituent cells”. Comment.

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118. What are the characteristics of a semipermeable membrane ?

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119. What is plasma membrane?

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120. Describe fluid mosaic model.

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