Why embryo sac in flower is called 7 celled and 8 nucleate?

Asked by Last Modified  

10 Answers

Follow 14
Answer

Please enter your answer

M.sc

Number of cells = 3 antipodal cells + 2 synergids + 1 egg cell + 1 central cell= 7 cells. BUT the CENTRAL CELL HAS TWO POLAR NUCLEI IN IT. Therefore total number of nuclei = 7 + 1 extra in central cell= 8 nucleate.
1 Comments
Dislike Bookmark

I teach......and I love it!

That's because there are 3 antipodals, 2 synergids, 1 egg cell and 1 central cell after the fusion of the two polar nuclei. The sum adds up to 07. Just before the fusion of the two polar nuclei, there are 8 nuclei. Hence 7 celled but 8 nucleate.
1 Comments
Dislike Bookmark

Biologist

It is so because after undergoing so many divisions, the embryo sac when become fully mature, it contains 7 cells and 8 nucleii. 3 antipodal cells, 3 synergids , 1 polar cell 3 nucleii of each antipodal cells, 3 nucleii of each synergids and 2 nucleii present in polar cell
Comments
Dislike Bookmark

The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other...
read more
The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other nucleus moves towards the chalazal end. Then, these nuclei divide at their respective ends and re-divide to form eight nucleate stages. As a result, there are four nuclei each at both the ends i.e., at the micropylar and the chalazal end in the embryo sac. At the micropylar end, out of the four nuclei only three differentiate into two synergids and one egg cell. Together they are known as the egg apparatus. Similarly, at the chalazal end, three out of four nuclei differentiates as antipodal cells. The remaining two cells (of the micropylar and the chalazal end) move towards the centre and are known as the polar nuclei, which are situated in a large central cell. Hence, at maturity, the female gametophyte appears as a 7-celled structure, though it has 8 nucleate. read less
Comments
Dislike Bookmark

Biologist

The embryo sac formation is produced during meiosis during megasporogenesis. The embryo sac has three celled egg apparatus. One egg cell and two synergids, three antipodal and two polar nuclei, totally 7- celled. Hence the embryo sac is 7- celled and 8- nucleated.
Comments
Dislike Bookmark

Home Tutor

i m a maths tutor. sorry dude.
Comments
Dislike Bookmark

The embryo sac formation is produced during meiosis during megasporogenesis. The enbryo sac has three celled egg apparatus.
Comments
Dislike Bookmark
It is called so because during the process of mega prognosis only one cell remain out of the four and other three degenerate then the fourth cell grows and it's nucleus divides by mitotic division into 8 nucleus after that the nucleus develops cytoplasm and cell membrane around them but two nuclei out...
read more
It is called so because during the process of mega prognosis only one cell remain out of the four and other three degenerate then the fourth cell grows and it's nucleus divides by mitotic division into 8 nucleus after that the nucleus develops cytoplasm and cell membrane around them but two nuclei out of 8 as the others have gone to two opposite poles in group of three the remaining two does not grow different cell membranes around and hence remain in the di-karyon phase for some time they share one cell hence it is said 8 nucleated and 7 celled. read less
Comments
Dislike Bookmark
Number of cells = 3 antipodal cells + 2 synergids + 1 egg cell + 1 central cell= 7 cells. But the central cell has two polar nuclei in it before the fusion of two polar nuclei. So there are eight nuclei. Hence seven celled but eight nucleate.
Comments
Dislike Bookmark
8
Comments
Dislike Bookmark

View 8 more Answers

Related Questions

What is the main function of swing in java programming?
Swing is a set of program component s for Java programmers that provide the ability to create graphical user interface ( GUI ) components, such as buttons and scroll bars, that are independent of the windowing system for specific operating system
compzone Computer Eeducation Center.
0 0
6
which book is good for physics for class Xi-xii
physics HC VERMA
Ramana
lim(x ?0)? (1+sin?x )^cot? x = ?
Dear Akshay, the question is not clear as there is some typing error. Please post the question again.
Kumar Upendra Akshay
If the quantity of charge on each of the two bodies is doubled, the force between them becomes __________. (Twice, Four times, Nine times, Sixteen times)
Four times
Narendra Kumar
0 1
7
Hi Everyone. Just wanted to know that How you guys usually charge your students? Is it by "Per Hour" or "per Month" or for "Entire Course"? And if its is by "per Month" or for "Entire Course" basis, then How many classes do you take in a week?
If it is for a single subject like maths, then u can charge monthly and offer three classes per month.
Pratik Soni

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Business Finance Class 12 (CBSE)
Class 12 - CBSE - Business Finance

Preethi

0 0
0
Qualifications and Appointment of Supreme Court Judges in India
The Supreme court Judges in India are appointed by the President on the advice of his Council of Ministers and in consultation with such persons as he deems fit. In the appointment of the Chief Justice,...
D

Deepa H.

1 0
0
How to get better Grades?
Two things - determination and dedication should be a part of your life.Study for you and your goals.Study for your parents they are spending bucks.Do not think of harwards, PhDs, majors. Forget the word...
K

Kushal Sharma

0 0
0
Features of Equity Shares-HSC,Class 12 -SP/OC,Class 11 Business Studies
What are features of equity shares?

Rajiv Vadera

1 0
0
Acid, Base and Salts
The reaction of an acid with a base to produce only salt and water is called a neutralization reaction. Acids Acids are sour in taste. If hydronium ions are found in a solution, the solution is acidic...

Tejas Academy Centre

1 0
0

Recommended Articles

Meet Mohammad Wazid, a skilled trainer for...

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Meet Swati, a Hindi Tutor from Bangalore

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Meet Sandhya R, a B.Sc tutor from Bangalore

Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...

Read full article >

Meet Raghunandan.G.H, a B. Tech Tutor from...

Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...

Read full article >

Find PUC Tuition near you
PUC Tuition in Delhi
PUC Tuition in Bangalore
PUC Tuition in Hyderabad
PUC Tuition in Chennai
PUC Tuition in Kolkata
PUC Tuition in Mumbai
PUC Tuition in Pune
PUC Tuition in Lucknow
PUC Tuition in Noida
PUC Tuition in Gurgaon
Online Tuition Class 12

Looking for Class 12 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you