Embryo-sac, Biology

Assignment Help:

Embryo-sac :

Embryo-sac is formed from megaspore mother cell.

  1. In embro-sac, there are 7 cells arranged in 3 groups. The 7 cells are one egg (female gamete), 2 synergids, one central cell (secondary nucleus) and 3 antipodals.
  2. All the cells except secondary nucleus are in haploid condition (n) secondary nucleus is diploid (2n)
  3. The synergids are also known as helper cells. These cells direct the growth of pollen tube towards the egg. They have beak like structure and are situated near the micropylar end.
  4. The 3 antipodals live only for a short duration. They are situated near the chalazal end of the embryo-sac.

908_Embryo-sac.png


Related Discussions:- Embryo-sac

Difference between sexual gametes and spores, Q. What is the difference bet...

Q. What is the difference between sexual gametes and spores? Do humans present sexual gametes or spores? Sexual spores are structures generated from meiosis with ploidy number

Influence of yolk on cleavage, Influence of Yolk on Cleavage Though b...

Influence of Yolk on Cleavage Though biological significance of yolk is to provide nourishment to the developing embryo, it is not part of the active cytoplasm. Yolk is dead

What is the significance of proteins for living beings, Q. What is the sign...

Q. What is the significance of proteins for living beings? Proteins play an essential role in nearly all biological processes. Due to their variety they can suppose many divers

Measurement of light intensity, Measurement of Light Intensity How do w...

Measurement of Light Intensity How do we measure the intensity of a source of light falling on a surface? You know that light spreads out uniformly in all directions from a sou

Define Stolon - Types of hyphae, Define Stolon - Types of Hyphae? Mic...

Define Stolon - Types of Hyphae? Microscopically, hyphae are aseptate and coenocytic. There are 3 kinds of hyphae: (a) Stolon - These grow horizontally on substratum surfa

What are the constituent elements of the blood, Q What are the constituent ...

Q What are the constituent elements of the blood? The blood is made of a liquid and a cellular part the fluid part is called as plasma and in it there are several substances li

Explain the distant osteogenesis, Explain the Distant Osteogenesis In t...

Explain the Distant Osteogenesis In this an extracellular matrix establishes the implant surface contact. The osteogenic cells line the host bone surface. The blood supply to t

List the criteria of implant success, List the criteria of implant success....

List the criteria of implant success. Criteria for implant success as suggested by Albrektsson, Zarb and Worthington are as follows: i) An individual, unattached implant is

Cloning, there are a restriction map of a plasmid and a human gene of known...

there are a restriction map of a plasmid and a human gene of known sequence. Your task is to clone the human liver cDNA for this gene so that the start codon is closer to the EcoRI

State the classification of nervous system, State the Classification of ner...

State the Classification of nervous system Neurological disorders can be categorised according to the primary location affected, the primary type of dysfunction involved, or th

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd