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development and morphogenesis physical appearance of plant (leaves…
development and morphogenesis
physical appearance of plant
Root
absorbing organ, sometimes storage
primary root or radicle
first organ to appear when seed germinates
grows downward to soil, anchoring and seedling.
primary roots becomes taproot.
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secondary roots
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
cortex
vascular cylinder
stem
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
lateral buds and leaves grow out of stem at intevaks
internode
intervals on the stem between nodes
terminal bud
growing portion at apex of shoot
leaves
parts
petiole
lamina
leaf base
venation
reticulate
parallel
types
simple
compound
palmately
leaflets are attached at the tip of petiole
pinnately
the midrib of leaf is divided into numerous leaflets and connected by common axis .
functions
photosynthesis
transpiration
guttation
storage
defence
outermost to innermost
https://www.google.com/search?rlz=1C5CHFA_enUS782US782&tbm=isch&sxsrf=ACYBGNRJXxvI2_FeqmsNmlOIuffKSQuczg:1568254065894&q=collenchyma&chips=q:collenchyma,g_1:sclerenchyma&usg=AI4_-kQLcTXVoYUKlkrLQKNPxnmd75nc0g&sa=X&ved=0ahUKEwipj4_UmcrkAhXRpFkKHWSfC4cQ4lYIMygE&biw=1440&bih=772&dpr=2#imgrc=Wkkgd0AhTQV2GM
:
https://byjus.com/biology/leaves-morphology-types-modification/
