Leaf Video Lecture | Science & Technology for UPSC CSE

leave the green flat expanded exogenous
lateral appendages developed from the
nodes of the stem our branches are
called leaves they have limited growth
and are arranged acropole in the axils
of the leaves axillary buds are present
functions of leaves they carry out
photosynthesis they control the
diffusion of oxygen and carbon dioxide
they promote internal transportation of
water and minerals by transpiration :
leaves leaves develop on the stem
example Coco's Rama leaves leaves
develop on the branches radical leaves
leaves develop on the roots example
Allium parts of a leaf the structure of
the leaf shows four parts namely one
leaf base too steep you three petiole
and four lamina leaf base the basal part
of the leaf is called leaf base the
leaves are attached to the stem at the
node by means of leaf base stipple the
small green lateral appendages present
on either side of the leaf base a call
stipules they are prominent in dicots
and rarely found in monocots they
protect the axillary buds
developing stages stipulate leaves with
stipules
X stipulate leaves without stipules
deciduous stipple stipules fall off by
the time lamina expands example my Kalia
persistence tip you stipules remain as
long as the leaf remains example Haissam
lazarus branched stipules in apamea
comic Liat branch stipules are present
petiole the stalk of the leaf is called
petiole it connects the laminar to the
stem it exposes the lamina to light it
allows the leaf lamina to flutter in
wind there by cooling the leaf and
bringing fresh air to surface it bears
the weight of the lamina and conducts
water and food materials between the
stem and leaf petiolate leaves with
petiole sessile leaves without petioles
amina the green expanded part of the
leaf is called lamina or the leaf blade
all the important functions of the leaf
are performed in this part only the
central prominent vein present in the
leaf lamina is called mid vein or midrib
the branch is developed from the mid
vein are called lateral vein leads