BIOL 1002 Chapter : Chapter 43
Document Summary
Plants produce new cells in special regions called meristems: meristem cells are undifferentiated (totipotent) embryonic cells. This means the cells have not become specialized. Once plant cells mature they become differentiated cells and usually don"t divide again: plant growth is mainly vertical and as a result plants grow longer not wider. This is the result of the location of the meristems. Meristems are found at both ends of the plant. Made up of thin-walled cells with a waxy cuticle. These cork cells are waterproof and help form the bark: the ground tissue system is a simple tissue system and is composed of three tissue types (fig. 43. 3): parenchyma tissue, round and used for storage. Collenchyma tissue: thicker cell wall, a little more elongated, used for storage and support. 43. 5): sieve-tube element (dead at maturity, the cells of the sieve tube have lost many of their cellular components (no nucleus, very few ribosomes, and very little endoplasmic reticulum).
