Which among the following is not a function of plasma membrane?

The correct option is D It acts as a channel for the transport of substances within the cell.
$\bullet$ Plasma membrane is the outer elastic membrane in animal cells. In plant cells, they are found beneath cell wall.
$\bullet$ Plasma membrane gives shape to the cell and protects it from the external environment.
$\bullet$ They are semi-permeable in nature, and hence allows entry and exit of only certain substances to the cell.
$\bullet$ Cell membrane are modified to perform certain functions like, absorption in microvilli.
$\bullet$ In some cells, the cytoplasm of adjacent cells become continuous to form plasmodesmata and allows transport of substances between the cells.