PBIO103 - Plants and People

Chapter 12-Plant Structure, Growth, and Development

12.1 PLANT BODIES VARY IN SIZE AND STRUCTURE

12.2 PLANT BODIES ARE COMPOSED OF ORGANS, TISSUES, AND MANY TYPES OF CELLS
Shoots, roots, leaves, flowers, fruits, and seeds are plant organs or organ systems
Plant organs are composed of tissues whose cells are linked by plasmodesmata
Plants grow by production of new tissues and cell enlargement
Primary apical meristems produce primary tissues
Secondary meristems produce wood and bark
Plants also grow by cell expansion
Plant tissues are composed of one to several cell types
Specialized cells arise by the process of differentiation

12.3 PLANTS DEVELOP FROM SINGLE CELLS OR SMALL PIECES
Plant bodies have distinctive symmetry and indeterminate growth

12.4 PLANT GROWTH AND DEVELOPMENT ARE REGULATED BY HORMONES

12.5 PLANTS USE PIGMENT-CONTAINING MOLECULES TO SENSE THEIR LIGHT ENVIRONMENTS

Keywords

Chapter 12
multicellular
development
wood
organ system
shoot
root system
leaves
flowers
buds
fruits
seeds
plasmodesmata
apical meristems
tissue systems
dermal tissues
epidermis
vascular tissues
ground tissues
pith
axillary buds
node
internodes
vascular cambium
cork cambium
secondary meristems
secondary tissues
collenchyma
collenchyma cells
sclerenchyma
sclereids
fibers
xylem
phloem
specialized cells
differentiation
secretory cells
phytoliths
trichomes
zygote
egg