Double fertilization is a unique process in flowering plants where two sperm cells fuse with two female gametes. One sperm fuses with the egg cell to form a diploid zygote. The other sperm fuses with the central cell to form a triploid endosperm. This ensures the embryo has access to nutrients for growth. Double fertilization occurs in 10 steps, beginning with pollination and ending with seed development. It is critical for reproduction in flowering plants.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
TESDA TM1 REVIEWER FOR NATIONAL ASSESSMENT WRITTEN AND ORAL QUESTIONS WITH A...
Fertilization.pptx
1. Name : Yasir ahmad
C.No : 64
Semester : 2nd
Department : agronomy
Assignment : 02
Subject : seed physiology
Course NO : agron 721
Submitted to : prof.dr.inamullah
2. fertilization
Fertilization is the process by which the male
gamete (sperm) from the pollen grain fuses with
the female gamete (egg cell) within the ovule to
form a zygote, which is the first cell of a new
plant. This process results in the formation of a
seed, which contains an embryo and a food
reserve tissue called endosperm. Fertilization in
plants is essential for the sexual reproduction
and propagation of the species.
3.
4. DOUBLE FERTILIZATION
Double fertilization is a
unique process that
occurs in the
reproductive cycle of
angiosperms
(flowering plants). This
process involves the
fusion of two sperm
cells with two female
gametes to form a
diploid zygote and a
triploid endosperm.
This unique process of
double fertilization is
one of the key features
that distinguishes
angiosperms from
other plants.
5. Double fertilization
Double fertilization is a unique process that occurs in
flowering plants, and it is one of the defining features
of angiosperms. It involves the fusion of two sperm
cells from a single pollen grain with two different
female gametes within the ovule. One sperm cell fuses
with the egg cell to form a diploid zygote, while the
other sperm cell fuses with the central cell to form a
triploid endosperm. Double fertilization is essential for
the successful reproduction and propagation of
flowering plants, as it ensures that the developing
embryo has access to the energy and nutrients
required for growth and development.
6. Step1: Pollination
The process of double
fertilization begins with
pollination, which is the
transfer of pollen from the
anther of a flower to the stigma
of the same or another flower.
The anther is the male
reproductive organ that
produces and releases pollen,
while the stigma is the
receptive surface that captures
and recognizes the pollen.
Pollination can occur in
several ways, such as by wind,
water, or animal pollinators.
7. Step2: Pollen Tube Formation
Once a pollen grain lands on
the stigma, it germinates and
forms a pollen tube. The tube
grows down the style, which
is the long, narrow part of the
pistil that connects the
stigma to the ovary. The
process of pollen tube
formation is guided by
chemical signals released by
the female reproductive
tissues. The tip of the pollen
tube is highly specialized and
secretes enzymes that break
down the stigma and style
tissues, allowing the tube to
penetrate these tissues.
8. Step3: Male Gametophyte
Development
The male gametophyte
develops from the pollen grain
inside the pollen tube. The
pollen grain contains a
vegetative cell and a
generative cell. The vegetative
cell forms the pollen tube,
while the generative cell
divides to produce two sperm
cells. In most angiosperms,
the generative cell divides just
before or after the pollen grain
lands on the stigma, producing
two sperm cells that remain
attached.
9. Step 4: Entry of the Pollen Tube into the Ovule
Once the pollen tube
reaches the ovary, it
grows through the
micropyle, which is a
small opening in the
ovule's outer covering.
The pollen tube then
grows towards the
female gametophyte,
which is located inside
the ovule.
10. Step 5: Female Gametophyte Development
The female gametophyte,
also known as the
embryo sac, develops
within the ovule. The
process of female
gametophyte
development involves
the division of the
megaspore, which is a
specialized cell within
the ovule. The
megaspore undergoes
several rounds of
mitosis to form the
embryo sac, which
contains the female
gametes.
11. Step6: Fusion of Sperm andEgg
Once the pollen tube
reaches the female
gametophyte, one of the
sperm cells fuses with
the egg cell to form a
diploid zygote. The
zygote will develop into
the embryo of the plant.
The fusion of the sperm
and egg is known as
syngamy.
12. Step7: Fusion of Sperm and Central Cell
The second sperm cell
fuses with the central
cell, which contains
two polar nuclei, to
form a triploid
nucleus. This process
is known as triple
fusion. The central cell
is a specialized
structure that
develops within the
female gametophyte.
The triploid nucleus
that forms as a result
of the fusion will
develop into the
endosperm.
13. Step8: Endosperm Development
After triple fusion, the triploid
nucleus divides repeatedly to
form the endosperm, a
nutrient-rich tissue that
provides nourishment to the
developing embryo. The
endosperm is essential for
the growth and development
of the embryo, as it provides
energy, nutrients, and
hormones required for the
embryo to develop into a
mature plant. Endosperm are
divided into three main types
based on their development
pattern.
14. 1. Nuclear Endosperm
In this type of endosperm,
the nuclei divide without
cytokinesis, resulting in a
large multinucleate cell that
later undergoes
cellularization to form the
endosperm. This type of
endosperm is found in
plants like Arabidopsis
thaliana and tomato. Nuclear
endosperm is the most
common and is found in
about 56% families of
angiosperms.
15. 2. Cellular Endosperm
In this type of
endosperm, the nuclei
divide and cytokinesis
occurs, resulting in the
formation of individual
cells that make up the
endosperm. This type of
endosperm is found in
plants like maize and rice.
Cellular endosperms
occur in 25% families of
angiosperms.
16. 3. Helobial Endosperm
This type of endosperm
is found in aquatic
plants like water lilies
and consists of two
types of cells - large
peripheral cells with
dense cytoplasm and
smaller central cells
with more vacuolated
cytoplasm. The central
cells are surrounded by
the peripheral cells,
forming a double layer
of endosperm. Helobial
endosperms occur in
19% families of
angiosperms.
17. Step9: Embryo Development
After fertilization, the
zygote undergoes
several rounds of cell
division and
differentiation to form the
embryo. The embryo
develops within the ovule
and is surrounded by the
endosperm. The embryo
will develop into a
mature plant once the
seed is dispersed and
germinates under
appropriate conditions.
18. Step 10: Seed Development
The ovule that contains the
fertilized egg, endosperm,
and embryo, will develop
into a seed. The seed is a
protective structure that
encloses and protects the
developing embryo and
provides the means for the
plant to disperse and
germinate. The seed coat,
which is derived from the
integuments of the ovule,
protects the embryo from
environmental stresses and
also plays a role in seed
dormancy.
19. Conclusion
Double fertilization is a unique and complex
process that occurs in flowering plants. It
involves the fusion of two sperm cells with two
different female gametes, resulting in the
formation of a diploid zygote and a triploid
endosperm. This process is essential for the
successful reproduction and propagation of
flowering plants and ensures that the developing
embryo has access to the energy and nutrients
required for growth and development. The
process of double fertilization is highly regulated
and involves a range of interactions between the
male and female reproductive structures of the
plant.