product s of this division are left in the meristem, and other differentiate
and are incorporated into tissues and organs. Meristem at the tips of roots
and in the buds of shoots are called the Apical Meristem.
- Apical Meristem cell division in this area produce new cells that enable a
plant to grow
in length a process called primary growth. - Primary growth lengthens
roots(pushing them through the soil) and shoots (growing upwards)
tissue produced by primary growth is called primary tissue. - Primary
growth differs in the root and the shoot. Root - Root tip is covered by a
thimble-like root cap which protects delicate dividing cells.
growth in length occurs just behind the root tip, where three zones of
primary growth are located: Zone of cell division, Zone of elongation, and
Zone of differentiation - The three zones overlap.
Zone of cell division - includes the root apical meristem new root cells
are produced in this region, including cells of the root cap. -Zone of
Elongation - Root cells elongate, sometimes to more than 10
times their length, it is this cell elongation that pushes the root into the
soil. Cells lengthen rather than expand, due to the circular arrangement
of cellulose fibers in their cell walls.
the three tissue systems of mature plants (dermal, ground, vascular)
complete their development in the zone of differentiation. - Zone of
Differentiation - Cells of the vascula