UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Take Class 12 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Class 12 Tuition > Learn Class XI-XII Tuition (PUC) > Why embryo sac in flower is called 7 celled and 8 nucle...
✕

Search in

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

Asked by Last Modified  

10 Answers

Learn Class XI-XII Tuition (PUC)

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

The equation of a current is given by i = Imsin2?t. The frequency of the current in Hz is a.) ? ? 2?. b.) ? ? 2. c.) 2? ? ?. d.) ? ? ?.
Kindly re-post the question without the question mark symbols.
Kumar Upendra Akshay
0 0
6
what is the difference between icse and cbse syllabus.And which is the best.
Syllabus volume is more in ICSE compared to CBSE.
Thirupathi
Which book is good for class xi-xii puc physics?
Modran ABC physics and basco publications
Ramu
In 1900, __________ proposed a formula which explained I detail the whole shape of the black body spectrum for all wavelengths. (Wein, Rayleigh, Einstein, Maxwell Plank)
Max Plank
Narendra Kumar
0 0
8
5 boys and 5 girls are sitting in a row randomly. The probability that boys and girls sit alternately is...... ?
There are total 10 seats. _ _ _ _ _ _ _ _ _ _. Case 1 1st seat is occupied by a boy. For this, the number of choices are 5. 2nd seat is occupied by a girl. For this number of choices again...
Kumar Upendra Akshay

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

Ask a Question

Related Lessons

Solution to a trigonometric problem using Weierstrass substitution
Let us solve one problem using Weierstrass substitution ∫ 1/(1 + cos x + sin x) dx applying Weierstrass substitution t= tan x/2 , sin x = 2 t/(1 + t²), cos x= 1 - t²)/ (1 + t²)...

B.Sudhakar

4 0
1
Current Ratio and Liquid Ratio
What are current and liquid ratios?

Rajiv Vadera

0 0
0
Easy Way For Chemistry
Chemistry is not that tough how much we are assuming. I heard from so many that sir, chemistry is all about remembering. But its not like that. Ex:- you can remember the elements name like this. hai...

Rahul K.

0 0
0
Computer Tution
Computer Tution near dhakuria railway station. Any class, any board. Rs 400 per month.

Dipan Mandal

0 0
0
Archimede's Principle
Archimedes' principle: principle that states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. The principle applies to both floating and submerged bodies...

Shabeer N.

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 Grade 12 Tuition near you
Grade 12 Tuition in Delhi
Grade 12 Tuition in Bangalore
Grade 12 Tuition in Hyderabad
Grade 12 Tuition in Kolkata
Grade 12 Tuition in Mumbai
Grade 12 Tuition in Chennai
Grade 12 Tuition in Pune
Grade 12 Tuition in Lucknow
Grade 12 Tuition in Jaipur
Grade 12 Tuition in Noida
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
X

Looking for Class 12 Tuition Classes?

The best tutors for Class 12 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 12 Tuition with the Best Tutors

The best Tutors for Class 12 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2025 All Rights Reserved