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

Define dark field microscope, Define Dark Field Microscope In this micr...

Define Dark Field Microscope In this microscope, condenser system is modified, so that only reflected and refracted light by specimen forms an image. Here, the object is bright

How to produce organic material from inorganic substances, What are the pro...

What are the processes that autotrophic beings use to produce organic material from inorganic substances? Autotrophic beings make organic material by photosynthesis or by chemo

What are plant tissues and leaf vien, What are plant tissues that constitut...

What are plant tissues that constitute the functional structures of the leaf veins ? The Leaf veins are made of the vascular tissues.They are constituted by the xylem and the p

Are there living beings without cells, Are there living beings without cell...

Are there living beings without cells? Viruses are measured the only living beings that do not have cells. Viruses are constitute by genetic material (DNA or RNA) enwrapped by

Why is a man’s voice usually lower than a woman’s voice, Q. Why is a man’s ...

Q. Why is a man’s voice usually lower than a woman’s voice? Pitch of the voice-how low or high it sounds-it depends on the length, tension and thickness of the vocal cords. As

Guidelines for earthquake-resistant construction practices , To ensure the ...

To ensure the building's resistance to potential earthquakes it should be configured, detailed and constructed accordingly. Any weakness in this regard may affect the building's re

Why male and female gametophytes are independent, Male and female gametophy...

Male and female gametophytes are independent and free-living in: 1. Mustard 2. Castor 3. Pinus 4. Sphagnum Sphagnum

Condition type of change to be transmitted to the offspring, What are the s...

What are the situations in which the environment can alter the genotype of an individual? What is the condition for this type of change to be transmitted to the offspring? The

What is alternate splicing, Which of the following is a true statement rega...

Which of the following is a true statement regarding alternate splicing? A. Alternate splicing permits for an increase in protein diversity by the differential use of exons whe

Pleural biopsy, Pleural Biopsy Pleural biopsy is one of the diagnostic...

Pleural Biopsy Pleural biopsy is one of the diagnostic procedure which may  cause lot of anxiety in  the patient. Procedure Pleural biopsies may be preformed surg

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