Fertilisation, Biology

Assignment Help:

Fertilisation:

  1. Fertilisation is the process of fusion of male and female gametes. For fusion of male and female gametes, pollen grains have to reach the surface of the stigma.
  2. Pollen grains received by stigma germinate and give rise to pollen tubes. Only one pollen tube finally reaches the embryosac.
  3. This tube will have 2 male nuclei, which migrate to the tip of pollen tube at the time of fertilisation.
  4. One male gamete approaches the egg and fuses with egg to form a diploid (2n) zygote. This is first fertilisation.
  5. The other male gamete reaches the secondary nucleus and fuses with it to form endosperm nucleus which will be triploid (3n). This is second fertilisation in embryosac.
  6. In this way, diploid zygote is formed by union of male and female gametes in embryosac of ovary and triploid (3n) endosperm nucleus is also formed during fertilisation. With this fertilisation is completed.

2457_Fertilisation.png


Related Discussions:- Fertilisation

Explain the importance of the auxin, a) How is the milk production regulate...

a) How is the milk production regulated by hormones in human female? Define. b) Explain the importance of the auxin / cytokinin ratio in plant tissue culture.

Explain about the torbed dryer, Explain about the Torbed Dryer? On the ...

Explain about the Torbed Dryer? On the other hand, is a variation of the fluidized bed dryer. This is designed for use with particulate foods. Torbed dryers are used to dry haz

Metabolism of lipids, The three main forms of fat found in food are glyceri...

The three main forms of fat found in food are glycerides (principally triacylglycerol [triglyceride], the form in which fat is stored for fuel), the phospholipids, and the sterols

differences between rna and dna , Ribo Nucleic Acid contains OH group at s...

Ribo Nucleic Acid contains OH group at second carbon where as Deoxyribo Nucleic Acid lacks OH group at Second carbon.....DNA is Double standed helix whereas RNA is single stranded

What are the functions of polypeptide chains, Q. Since among the 64 codons ...

Q. Since among the 64 codons of mRNA 61 codify amino acids that form polypeptide chains what are the functions of the three remaining codons? Since there are 20 amino acids and

Lower calorific value (lcv) or net calorific value (ncv), It is defined as ...

It is defined as the amount of heat liberated when one unit mass of fuel is burnt and the products of combustion are allowed to escape.                                  LCV = HC

Describe the structure of chromatin and chromosomes, Describe how the struc...

Describe how the structure of chromatin and chromosomes facilitates the following functions: a) DNA packaging. b) Regulation of gene expression.  c) Replication at the

Passage of pollen tube, Passage of Pollen Tube In cotton, the pollen p...

Passage of Pollen Tube In cotton, the pollen produces a tube within an hour which grows on the surface of the stigmatic hairs, and then between the cells of the stigma at the

Which chemical causes tooth destruction, The bacteria that cause dental cav...

The bacteria that cause dental cavities in humans break down sugars, releasing what chemical which causes tooth destruction? a) Acids b) Bases c) Enzymes d) Monosaccha

Define beriefly about the phytoestrogens, Define beriefly about the Phytoes...

Define beriefly about the Phytoestrogens? You may be aware of the surging interest in phytoestrogens (PE) especially in connection with osteoporosis. This section briefly discu

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