a

POLLINATION AND FERTILISATION

pollination pollination is commonly

defined as the process of falling

transfer from anther to stigma of a

flower pollen grains are formed in the

pollen sacks which are completely

enclosed by multi-layered and purple

therefore the first obvious requisite

for pollination is the opening of anther

sack to release the pollen grains

entered essence depending on the source

of pollen pollination can be divided

into two types one self pollination Otto

gummy - cross pollination Eluga me self

pollination

Otto gimme transfer of pollen grains

from the antle's to the stigma of the

same flower is called as self

pollination cross pollination Eluga me

cross pollination is further classified

depending on whether the pollination has

occurred between two flowers of the same

bird Gaetano gamete or between two

flowers of different plants zinogre me

from a geneticists point of view

jadon odami is similar to self

pollination because all the flowers of a

plant are normally genetically identical

cross pollination makes sense only when

two different plants either of the same

species or different species are

involved in this process

pollination ecologists plead that since

gage Mogami

and Zen yoga me both requires similar

ecological fathers for pollen

transference they should be considered

under one category

self-pollination is possible only if

those plants which bed bisexual flowers

that achieve an theld iessons

and receptivity of stigma simultaneously

the majority of angiosperms bear kazmo

gammas flowers which mean the flowers

exposed their mature anthers and stigma

to the pollinating agents this may

brought by opening the flower all the

organs may protrude from a closed flower

in such a manner as to expose themselves

to the same agents another group of

plants have seeds they do not expose the

sex organs such rubbers are called place

to gammas and the phenomenon is term as

Callisto goomy which may be inherent or

ecological induced by severe

environmental conditions common alia

Bengal lenses bears two types of flowers

a aerial flowers which are brightly

colored blue or violet Casper gammas and

insect pollinated be underground flowers

which are dull and twist agamas flowers

born on the subtend e'en plants of the

rhizome under certain environmental

conditions the plants which commonly

form kazmo gammas flowers start

providing place to gammas flowers inside

the ovary it consists of ovals and each

oval has an egg cell which is a female

gamete the pollen that is produced by

pollen grain transfers from stamen to

stigma it moves to the style and reaches

ovary the male germ cell or male gamete

produced by pollen grain fuses with the

female gamete that is present in the

ovule this is called as fertilization

double fertilization

SG nabeshin 1898 was the first to show

that both the sperms released by a

pollen tube are involved in

fertilization they fertilize two

different components of the embryo sac

the phenomenon is unique to angiosperms

and scored double fertilization the

nucleus of one of the sperms fuses with

the egg nucleus thus completing Singam

II this results in the formation of a

diploid cell the zygote the other male

gamete moves towards the two polar

nuclei located in the central cell and

fuses with them to produce triploid

endosperm nucleus as this involves the

fusion of three haploid nuclei it is

termed as triple fusion since two types

of fusion single me and triple fusion

takes place in an embryo sac the

phenomenon is termed double

fertilization and event unique to

flowering plants the central cell after

triple fusion becomes the primary

endosperm cell P EC develops into

endosperm

while the zygote develops into an embryo