0 the hard outer covering, consisting mainly of cellulose, that surrounds a plant cell
1 the hard outer covering that surrounds a plant cell and that consists mainly of cellulose
A typical living cell may be described as composed of a cell wall and contents.
As a result the cell walls grow thinner with loss of moisture,—in other words, the cell shrinks.
Each plant consists of a mass of protoplasm surrounded by an ill-defined cell wall.
The membrane surrounding the cell is known as the cell wall, and in young plant cells is always composed of cellulose.
While among plants the cell wall is almost always well developed, it is very common for animal cells to be entirely lacking in this external covering—as, for example, the white blood-cells.
Rather, a stimulus released from the cotyledon is more likely to induce the major cell wall degrading enzyme, endo- mannanase, within the endosperm itself.
The endosperm has a very thick peripheral cell wall (cw).
Therefore, most work has been performed on isolated aleurone layers (in which the starch is removed) and protoplasts (aleurone cells lacking the cell wall).
