Question

what is fertilization ? describe the chemical events of fertilization in brief

Answer 1

Hey!

Ur answer is :-

Fertilisation is the fusion of gametes to initiate the development of a new individual organism.[2] The cycle of fertilisation and development of new individuals is called sexual reproduction. During double fertilisation in angiosperms the haploid male gamete combines with two haploid polar nuclei to form a triploid primary endosperm nucleus by the process of vegetative fertilisation.

Chemical Events :-

1. Approximation of sperm and ovum
2. Penetration of structures surrounding the ovum
3. Activation of ovum

#riShu:-)

Answer 2

⍟⍟⍟⍟⍟⍟Fertilization occurs when male gamete (germ cell) fuses with female gamete to form a single celled zygote ..

it occurs in multicellular organisms performing sexual reproduction.

***in plants the end result of fertilisation is the see whereas in animals it is a new individual⍟⍟⍟⍟⍟

>>>>>>>>IN PLANTS..

---------in plants when a Pollen Grain falls on Stigma of the carpel it bursts, open and grows a pollen tube downwards through the style towards the female gamete in ovary .

••••••••••••Then it enters into the ovule in the ovary

---------------In OVARY; the male gamete of pollen tube combines with the nucleus of female gamete present in the ovule to form a fertilized egg (called zygote) and thus as we say that fertilization has taken place ..

°°°°°°°°°°thus the fusion of male and female gamete to form a zygote during sexual reproduction is called fertilization ..

****it is clear that the process of fertilization produces zygote which is actually a "fertilized ovum" of "fertilized egg".

>>>>>>>>>IN ANIMALS..

•••••••In animals the male gamete (male germ cell) call sperm fuses with the female gamete (female germ cell) called

ova and forms a single cell called zygote

°°°°°°°°The zygote grows and develops into embryo and embryo later develops into foetus and then it forms a new baby ..

NOTE :- ⍟⍟⍟⍟there are two different modes of fertilisation in nature⍟⍟⍟⍟

°°°°° INTERNAL FERTILISATION°°°°

>>>>>>>> the fertilized which inside the female body is called INTERNAL

FERTILISATION.

It occurs in in mammals, human beings, birds, reptiles etc..

°°°°°EXTERNAL FERTILISATION °°°°°

>>>>>>> the fertilization with takes place outside the female body is called as EXTERNAL FERTILISATION.

---it occurs in amphibians like frogs, toads, fishes etc

<<<<<< in external fertilization the female and male gamut release the sperms and eggs in water fertilization takes place by collision between sperms and eggs..

>>>>>for example the males and females of frogs and fishes releasing sperms and eggs in water in which they live.

the sperms and collide with the action fertilized outside the female body of frog a fish .