Organization in non-reduced embryo sacs , Biology

Assignment Help:

Organization in non-reduced embryo sacs

The fate of a nucleus in the embryo sac depends upon its position. Many irregularities in the disposition of nuclei in the early polarization have been recorded. The mature embryo sac otherwise shows a nod organisation with two synergids, three antipodals, an egg and pro endospermic cell.

Embryogenesis in non-reduced embryo sacs

Embryo development in these embryo sacs can take place as a consequence of pollination. Those associated with pollination are called eugamous, semigamous or pseudogamous and those that develop without pollination stimulus are termed parthenogenic.

Eugamy: Normal fertilization of the apomictic eggs takes place to produce the zygote.

Semigamy: The male gamete penetrates into the egg but does not fuse with the egg nucleus. Both the nuclei multiply independently but the division of the male nucleus stops early.

Unreduced Pseudogamy: The male gamete degenerates either inside or outside the embryo sac. Thus, the egg develops without fusion taking place.


Related Discussions:- Organization in non-reduced embryo sacs

Explain about the niacin - water soluble vitamin, Explain about the Niacin ...

Explain about the Niacin - Water Soluble Vitamin? Niacin is chemically synonymous with nicotinic acid although the term is also used for its amide (nicotinamide). Nicotinamide

What is physical accommodation, What is Physical Accommodation Physical...

What is Physical Accommodation Physical Accommodation is the actual physical deformation in the lens power. It is measured in diopters, e.g., if the focussing power of the eye

Which is the autotrophic group responsible for production, Which is the aut...

Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth? Cyanobacteria and Algae of the phytoplankton are the organisms that

Yersinia enterocolitica, Yersinia enterocolitica The genus Yersinia con...

Yersinia enterocolitica The genus Yersinia contains of 3 human pathogenic species, Y. enterocolitica, Y. pseudotuberculosis and Y. pestis, among which, Y. enterocolitica finds

What is the difference between rna and dna, Q. Concerning the nitrogen- con...

Q. Concerning the nitrogen- containing bases that participate in nucleotides, what is the difference between RNA and DNA? In DNA nucleotides can be formed of thymine (T), adeni

Introduction to meat products, Meat products Meat is an important commo...

Meat products Meat is an important commodity in the diet of people in view of its complimentary role in balancing the diet with rich source of amino acids, vitamins and mineral

Protozoa, the function of contractil vacuole

the function of contractil vacuole

The Integumentary system, what are some technologys used in the integumenta...

what are some technologys used in the integumentaryy systems

What is choanocytes, Which one of the following statements about all the fo...

Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct? 1. Penguin is homiothermic while the remaining three are poikilothe

Explain working of refrigerator in microbiology laboratory, Explain the Wor...

Explain the Working of Refrigerator in Microbiological Laboratory? Refrigerator is a basic requirement in microbiological laboratory. It is used for maintaining microbial cultu

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