development and morphogenesis
physical appearance of plant
Root
stem
leaves
absorbing organ, sometimes storage
primary root or radicle
secondary roots
first organ to appear when seed germinates
grows downward to soil, anchoring and seedling.
primary roots becomes taproot. #
it grows laterally to form a taproot system. such as carrots and turnips.
somes roots are called adventitious roots
arises from an organ than stem i.e. stem and sometimes leaf.
adventitious roots known as aerial root either pass for some distance through air before reaching soil or hanging in the air.
i.e. corn, screw pine.
the primary tissues of root
epidermis
outermost to innermost
cortex
vascular cylinder
primary function is to support the leaves to conduct water and minerals to the leaves where it can be converted into usable products by photosynthesis
consist of vascular tissue xylem and pholem
stem consists of
node
internode
terminal bud
growing portion at apex of shoot
lateral buds and leaves grow out of stem at intevaks
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intervals on the stem between nodes
parts
petiole
lamina
leaf base
venation
reticulate
parallel
types
simple
compound
functions
photosynthesis
transpiration
guttation
storage
defence
palmately
pinnately
leaflets are attached at the tip of petiole
the midrib of leaf is divided into numerous leaflets and connected by common axis .
