Seed Video Lecture | Additional Study Material for Class 11

the sea
seed is the mature ovule a seed is
composed of the seed coat embryo and
some reserve food embryo is made up of
radical blue mikhyl and one or two
cotyledons
types of seeds seeds are of two types
depending upon the number of cotyledons
present in a seed they are die
quarter-latino seeds and
monocotyledonous seeds seeds may be
classified into two types on the basis
of presence or absence of endosperm
endosperm exceeds our alba - and non
endosperm exceeds our Xterra - read
through the table carefully to learn
about the examples of alba - and eggs
albumin is seeds
comparison of bean seed castor seed and
maize grain bean seed bean seed has two
cotyledons cotyledons store food
endosperm is absent in the bean seed
hilum and micro file are visible seed
coat or testa is the outermost layer
castor seed castor seed has two
cotyledons got Aladdin's are thin and
leaf like endosperm stores food hilum
and micropile are hidden by the Karanka
seed coat or testa is the outermost
layer
Mays grain maize grain has one cotyledon
cotyledon is thin and membranous
endosperm stores food hilum and
micropyle are not visible seed coat
testa and fruit wall pericarp are fused
to form the outer layer
types of germination on the basis of the
behavior of cotyledons the germination
may be a vigil germination or hypogea
termination in the epidermis the
cotyledons are pushed upwards above the
soil there is a rapid growth and
elongation of the high poco tiles in the
hypogea termination a seed remains
inside the soil the epical tile
elongates faster than the high poco
tiles
conditions essential for germination the
seeds germinate only if all the three
factors that is water oxygen and
suitable temperature are available in
the absence of any one of these factors
germination does not occur
observe the diagram carefully epiderm
initial in beam seed the diagram shows
epidural germination in the beam seed
due to the elongation of hyper coat
aisles the cotyledons are carried above
the soil surface
you
hypogea germination in maize grain
observe carefully the hypo gel
germination in the maize grain note that
the cotyledon has remained underground
unlike the condition in bean seed the
primary root does not form the main root
system adventitious roots originate
close to the primary root and develop
into the fibrous root system
vivy Perry vivy Paris germination in
rhizophora is shown here Very Berry is a
special type of germination in mangroves
where the seed does not show dormancy
seeds begin to germinate while the fruit
is still attached to the parent plant
the seedling drops into the saline water
with the radical end downwards it is an
adaptation for germination and survival
of the seedling in waterlogged areas