DEFINITIONS AND KEY POINTS OF Cell wall(PLANT ANATOMY DEVELOPMENT)

Annular

These are ring like thickening. In this case. ring of lignin are deposited one above the other.

Scalariform

These are ladder like lignin thickenings.

Spiral

In this case. thickenings are arranged in spiral bands.

Reticulate

In this case. lignin thickenings form networks

Pitted

The entire cell W. all is thickened. It has only few tin-thickened areas called pits.

Micelles

Micelles arc crystalline aggregate of cellulose molecules.

Incrustation

The addition of these substances in cellulose fibers is called incrustation. It increases the
tensile strength of cell wall.

Plasmodesmata

The- plasmodesmata are cytoplasmic strands that extend through the pores in adjacent cell walls.

Pits

Cavities or thin areas within the thick secondarY %s ail are called pits.

Torus

The pit membrane of bordered pit develops an  thickening in the middle. It is called
torus.

Blind pits

Some pits do not have any comp! 1111eMary pit. Such pits are called Hind pits.

Cutinization

The process of deposition of cutin is called cutinization.

Suberization

The process of deposition of subedit is called suberiiation.