MODULE 1 LECTURE 3 Plant Cells and Plant Tissue

BIOA02 MODULE 2 LEC 3: Plant Cells and Plant Tissue

-two different kinds of cells: 1) undifferentiated cell 2) differentiated

cells

--differentiated cells are like stem cells in animals

-differences between animals and plants: plants have indeterminate

growth (can grow forever if environment permits and animals have

determinate growth (fixed growth)

Undifferentiated Cells

-undifferentiated cells are also called meristematic cells and totipotent

-in animals  we run out of stem cells (we only have them at the

embryonic stage) whereas plants have undifferentiated cells

throughout their life

is fixed)

-two kinds of meristematic cells (primary and secondary)

-there are two PRIMARY meristematic groups: one at the shoot (called

shoot apical meristem) and one at the root (called root apical

meristem)

-as plant grows, it develops SECONDARY meristems from the shoot and

-primordia leaves encapsulates the soot apical meristem  protects it

from the environment  layers and layers of leaves

-protection of root apical meristem is different because roots have to

push through the harsh soil

-root apical is set back from the root stem  cells divide and send

them to the front to make root cap  gets shaved off as it pushes

through but production of root cap cells keeps up with the shaving

Differentiated Cells

-two kinds: simple and complex plant tissue

-simple = 1 type  3 kinds of tissue: parenchyma, collenchyma,