Answer
426.9k+ views
Hint: The female gametophyte is also called the megagametophyte or the embryo sac. Whereas the male gametophyte is also called the microgametophyte or the pollen grain.
Complete Answer:
The female gametophyte’s formation from one single functional megaspore is known as Monosporic development.
- The functional megaspore’s nucleus divides mitotically and forms two nuclei - which move to the opposite poles. Thus, forming a two-nucleate embryo sac.
- Two more mitotic nuclear divisions occur, and form the four-nucleate and eight-nucleate stages of the embryo sac.
- These are free nuclear type mitotic divisions, in which karyokinesis is not immediately followed by cytokinesis.
- After the eight-nucleate stage, the walls are laid down, thus organising the typical female gametophyte. Six out of the eight nuclei are surrounded by cell walls and are organized into cells; the remaining two nuclei, called the polar nuclei are situated below the egg apparatus.
- A typical angiosperm embryo sac at maturity is eight nucleate and seven cells. The mature embryo sac contains 3 synergid cells at the micropylar end, 3 antipodal cells at the chalazal end, an egg cell at the center, and a 2 polar nuclei, which fuse together to form the secondary nucleus.
Additional information:
- In most of the flowering plants, a single megaspore mother cell is present at the micropylar end of the ovule’s nuclear region. It undergoes meiosis to form four haploid megaspores.
- Later, out of these four megaspores, only one functional megaspore develops into the female gametophyte, while the remaining three degenerate.
Note: The female gametophytes form the female gametes and produce the physical and molecular basis for beginning of the seed development and fertilisation.
Complete Answer:
The female gametophyte’s formation from one single functional megaspore is known as Monosporic development.
- The functional megaspore’s nucleus divides mitotically and forms two nuclei - which move to the opposite poles. Thus, forming a two-nucleate embryo sac.
- Two more mitotic nuclear divisions occur, and form the four-nucleate and eight-nucleate stages of the embryo sac.
- These are free nuclear type mitotic divisions, in which karyokinesis is not immediately followed by cytokinesis.
- After the eight-nucleate stage, the walls are laid down, thus organising the typical female gametophyte. Six out of the eight nuclei are surrounded by cell walls and are organized into cells; the remaining two nuclei, called the polar nuclei are situated below the egg apparatus.
- A typical angiosperm embryo sac at maturity is eight nucleate and seven cells. The mature embryo sac contains 3 synergid cells at the micropylar end, 3 antipodal cells at the chalazal end, an egg cell at the center, and a 2 polar nuclei, which fuse together to form the secondary nucleus.
Additional information:
- In most of the flowering plants, a single megaspore mother cell is present at the micropylar end of the ovule’s nuclear region. It undergoes meiosis to form four haploid megaspores.
- Later, out of these four megaspores, only one functional megaspore develops into the female gametophyte, while the remaining three degenerate.
Note: The female gametophytes form the female gametes and produce the physical and molecular basis for beginning of the seed development and fertilisation.
Watch videos on
What is meant by monosporic development of female gametophyte?
![icon](https://i.ytimg.com/vi_webp/574jgThKrXo/hqdefault.webp)
Sexual Reproduction in Flowering Plants Class12 NCERT EXERCISE1.5| Class 12 Chapter 1| Kanika Sharma
Subscribe
likes
32 Views
11 months ago
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)