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Cell : The Unit of Life

Short Answer Type

121. Give examples of infoldings of cell membrane.

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122. Describe evaginations of cell membrane with an example.

Evaginations are out foldings of cell membranes.

Example : Microvilli. These are the evaginations present on epithelial cells like those of ileum. They help to increase the surface area for exchange of materials and absorption.

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123. What is the disadvantage of freely permeable membrane?

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124. What is diffusion ? Describe its importance in cell.

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125. Define osmosis, endosmosis and exosmosis.

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Long Answer Type

126. Describe different types of membranes.

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127. Describe functions of cell membrane.

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Short Answer Type

128. Describe cell wall.

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Long Answer Type

129. Give the functions of cell wall.

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Short Answer Type

130. Briefly explain the composition of cell wall.

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