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

Deficiency diseases, DEFICIENCY DISEASES Animals may suffer from diseases...

DEFICIENCY DISEASES Animals may suffer from diseases caused by deficiencies of energy and proteins, mineral nutrients and vitamins, which generally occur either due to deficiency

Classifications of mechanical cleaning devices, Q. Classifications of mecha...

Q. Classifications of mechanical cleaning devices? In general, three classifications of mechanical cleaning devices are available for the dental office. They are:  ult

Explain what is dna, Explain what is DNA? DNA : DNA is the source of t...

Explain what is DNA? DNA : DNA is the source of the information that directs the development of the cell. Although all segments of DNA are not active in every cell in the huma

Procedures for diagnosis - polymerase chain reaction (pcr), P o lymer...

P o lymerase chain reaction (PCR): The PCR technique enables the exponential amplification of nucleic acid sequences from any biological samples. In the last few ye

What are the pancreas, Pancreas Insulin (β cells) Promotes glucose en...

Pancreas Insulin (β cells) Promotes glucose entry in many cells, and in this way controls carbohydrate metabolism. Glucagon (α cells) Increases synthesis and release of

Characteristic of ecotone, Characteristic of Ecotone A general charact...

Characteristic of Ecotone A general characteristic of ecotone is that it has sufficiently greater number of species and the diversity of most of the species at times is higher

Advantage and disadvantages of fensom and spanner, Advantage and disadvanta...

Advantage and disadvantages of Fensom and Spanner Electroosmotic Flow Hypothesis The model has several advantages over Munch's model. The presence of P- proteins, and the occl

Fragmentation and regeneration, Fragmentation and Regeneration Both t...

Fragmentation and Regeneration Both the situations mentioned above that is whether occurring naturally or accidentally, can in general, be categorized like fragmentation. Of

Cat assay, CAT assay  is an enzyme assay. CAT stands for the chloramphenico...

CAT assay  is an enzyme assay. CAT stands for the chloramphenicol acetyl transferase, a bacterial enzyme which inactivates the chloramphenicol by acetylating it. CAT assays are man

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

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