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

# FUNGAL NUTRITION, Write on spoilage of food products by fungi,nutrition,c...

Write on spoilage of food products by fungi,nutrition,condition for growth,consequencies and prevention.

Why we not inundated with bacterial infections, We are told that every surf...

We are told that every surface we touch is teeming with bacterial cells, and bacteria are found in the pools we swim in, the water we wash with, and on the hands of friends. Why ar

Explain the bioavailability of vitamin d, Explain the Bioavailability of Vi...

Explain the Bioavailability of Vitamin D? The nutritional availability of vitamin D is less significant because it can be endogenously produced and retained for long periods by

What is defense mechanism, What is Defense mechanism Defense mechanism...

What is Defense mechanism Defense mechanism  relate to the body's ways to protect itself from any infection or a disease

Disorders associated with copulation and ejaculation, Disorders associated ...

Disorders associated with copulation and ejaculation Lack of libido refers to too long “reaction time” to complete absence of sexual desire for females in standing heat. The i

Name the vertebrate class, Which is the vertebrate class that is considered...

Which is the vertebrate class that is considered the first entirely terrestrial? The first totally terrrestrial vertebrate class, totally independent from the aquatic habitat,

Clonning, write a note on clonning

write a note on clonning

Explain transposition with vsd with restricted pulmonary, Explain transposi...

Explain transposition with VSD with restricted pulmonary? Transposition of great arteries with VSD with restricted pulmonary blood flow: Restriction to pulmonary blood flow

History of evolution, History of evolution? Evolution is usually define...

History of evolution? Evolution is usually defined as "change over time." In spite of the incredible diversity of life found on Earth, many fundamental characteristics are shar

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