The diagram details the life cycle of a pine tree (sporophyte). Overall, there are several stages in the cycle, including the combination of various components of the tree’s pinecones and the combined cell’s growth.
At first, the pine tree is guaranteed to give out 2 types of cone-related cells that represent 2 genders, which are seed cone (female) and pollen cone (male). The female cell found in the pinecone consists of megasporocyte and megasporangium surrounded by ovule, while the male one located at the bottom of the pine tree’s branches contains microsporangium and microsporocyte. Undergoing meiosis, the former is next embiggened in order to hold megaspores that will die shortly after except one. Simultaneously, meiosis causes the male cell to become pollen grain, which then enters the enlarged female cell and attaches to its edge through pollination.
Afterward, the united cell starts its development with pollen tubes being grown from the pollen grain and archegonium being made inside the surviving megaspore that is expanded. After a period of time, the elongating pollen tubes eventually reach the archegonium and start covering them to create sperm and egg. Following this, thanks to fertilization, both egg and sperm are able to mature into a zygote, then seeds that can be found in the upper area of the pinecone. Once the seeds find an ideal environment, the early stage of the tree (embryo) is mutilated inside the seed by absorbing food. Finally, the embryo goes through the seed coat to grow into a seedling, then a pine tree, which repeats the cycle.
The diagram
details
the life cycle of a
pine
tree
(
sporophyte
).
Overall
, there are several stages in the cycle, including the combination of various components of the
tree’s
pinecones
and the combined
cell’s
growth.
At
first
, the
pine
tree
is guaranteed
to give out 2 types of cone-related
cells
that represent 2 genders, which are
seed
cone (female) and
pollen
cone (male). The female
cell
found in the
pinecone
consists of
megasporocyte
and
megasporangium
surrounded by ovule, while the male one located at the bottom of the
pine
tree’s
branches contains
microsporangium
and
microsporocyte
. Undergoing meiosis, the former is
next
embiggened in order to hold
megaspores
that will
die
shortly after except one.
Simultaneously
, meiosis causes the male
cell
to become
pollen
grain, which then enters the enlarged female
cell
and attaches to its edge through pollination.
Afterward, the united
cell
starts
its development with
pollen
tubes
being grown
from the
pollen
grain and
archegonium
being made
inside the surviving
megaspore
that
is expanded
. After a period of time, the elongating
pollen
tubes
eventually
reach the
archegonium
and
start
covering them to create sperm and egg. Following this, thanks to fertilization, both egg and sperm are able to mature into a zygote, then
seeds
that can
be found
in the upper area of the
pinecone
. Once the
seeds
find an ideal environment, the early stage of the
tree
(embryo)
is mutilated
inside the
seed
by absorbing food.
Finally
, the embryo goes through the
seed
coat to grow into a seedling, then a
pine
tree
, which repeats the cycle.