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Selina Solutions Class 9 Biology Solutions for Exercise in Chapter 5 - Pollination And Fertilization
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What is the function of the pollen tube? Explain it with the help of a diagram
Answer:
The pollen tube emerges out of the pollen grains by breaking through its exine, growing from the style and stigma as a result of dissolving the tissues brought about by the enzymes, finally reaching the ovary. Here, it makes way to the ovule via the micropyle – a small pore.
Video transcript
"hello everyone welcome to little
this is priya and here we have a
question about pollen cream let us look
into the question
what is the function of the pollen tube
explain it with the help of a diagram
so this is a pollen grain
this is a structure of pollen grain and
this is a structure of pollen grain
once it has germinated and formed a
pollen tube
and i will explain you what is the use
of this fallen
tube once when these
pollen grain has started to germinate
it has before that we have to look into
the structure of this fallen grain
the pollen grain has outer surface which
is called exign
inner layer which is called enzyme and
it has two nucleus
the first nucleus which helps in
production of this following tube is
tube nucleus and the other nucleus is a
generative nucleus which will produces
two male gametes and this
on the outer outer surface of the pollen
grain
it has a germ pore through which the
pollen grain
starts to germinate and
for the germination of fallen green the
tube nucleus is useful
because tube nucleus helps in
germination of pollen grain and also it
helps in formation of
pollen tube so here you can see
from this pollen nuclei pollen tube as
arising
and going towards the ovary
and this pollen tube is formed because
of this
because of this tube nucleus
and this tube nucleus shows the
direction how the pollen tube has to
move
and back of it the generator nucleus
will start to move
and in between it forms into two
male gametes are the sperms two male
gametes
and these male gametes will follow the
pollen tube
and once it reaches the ovary
this is the oval structure of ovule
having the seven
cells inside it this is a way how the
pollen tube enters
into the egg and once this pollen tube
enters into this ovule at the micropile
fallen tube nucleus disintegrates
and the two male gametes which are which
has followed
the pollen tube will enter
into this ovule through the micropile
into synergies here one of the male
clemate fuses with egg and forms a
zygote so here one male gamete fuses and
forms a
zygote
and other male gamete will fuses with
the
second poly polar nuclei
and forms a endosperm and this forms
endosperm which later the embryo
takes nutrition from this endosperm
because of two fertilizations are taking
place inside this ovule we call this
fertilization
as double fertilization so in this way
the pollen chips helps the male gametes
to reach the
ovule and get fertilized hope you
understand this video
if you like my video please subscribe to
our leader channel and if you have any
doubts you can keep a message in comment
box thank you"
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