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 food applications of agar, Food Applications of Agar The bakery...

Food Applications of Agar The bakery industry has been the largest user  of agar because of its heat- resistant gel properties. Confectionary products, such as agar jelly candi

Define measuring body composition- multiple isotope dilution, Define measur...

Define measuring body composition- Multiple isotope Dilution? Multiple isotope dilution (Total and extracellular body water): It is based on the principle that certain substanc

Does natural selection produce an effect directly on genes, Does natural se...

Does natural selection produce an effect directly on genes, on genotypes, or on phenotypes? Explain please.

What is the still retorts, What is the Still Retorts? Still Retorts are...

What is the Still Retorts? Still Retorts are used in canning plants for heating foods in glass containers or different sizes of cans. These retorts are usually cylindrical in s

Explain hepaticae, Hepaticae (Liverworts) The gametophyte is thalloid b...

Hepaticae (Liverworts) The gametophyte is thalloid body or simple stem and leaves, with aquatic or semi-terrestrial habit. Rhizoids are multiceillular. Some examples : Mar

Explain risk factor global perspective in heart dieases, Explain risk facto...

Explain risk factor at the global perspective in heart diease? While the risk of Cardio-vascular diseases has been found to be variable in different ethnic groups with the high

Problem of polarity in regeneration in planarians, Problem of Polarity in R...

Problem of Polarity in Regeneration in Planarians As in Hydra, flatworm regeneration as well appears to occur in a polar fashion. There seems to be ananterior-posterior gradie

Explain genetically modified foods, Normal 0 false false fa...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

How do embryos of placental mammals excrete nitrogen wastes, How do embryos...

How do embryos of placental mammals excrete nitrogen wastes? Placental animals, as well as embryos, excrete urea. In the adult placental mammal urea is excreted by the urine.

Integrated approach plus mastering, I recently rented Physiology, An Integr...

I recently rented Physiology, An Integrated Approach and I was looking online because I have to also get the A&P access code and realize I could have rented it too with my book. Is

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