class 10 chapter 7 how do organisms reproduce

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1. FERTILISATION

2. Fertilization
The fusion of a male gamete (sperm) and a female
gamete (ovum) to form the zygote, is called
fertilization.
site Of fertilization:-
The fertilization takes place in
ampullary region of oviduct
(fallapian tube)

3. 01.
02.
The semen is released by the penis into
the vagina
From the vagina sperms swim rapidly
through the cervix enter into the
uterus and finally reach the
ampullary region of fallopian tube
insemination

Movement of
sperm

4. Fertilization can only occur if the ovum
and sperms are transported
simultaneously to the ampullary
region.this is the reason why not all
copulations lead to fertilization and
pregnancy

5. After, the sperm reaches the ampullary region of fallopiantube:
-

There will be a release of sperm lysine which
will help the sperm enter into the cytoplasm
of the ovum through the zona pellucida and
the plasma membrane
Acrosmal reaction

7. Cortical reaction
The cortical enzymes will hardens
the zona pellcida
Thus ,prevents polyspermy
ensure monospermy

8. As soon as the sperm reaches the plasma
membrane of ovum
Second meiotic division resumes and completes
Haploid nucleus of the sperm and that of the
ovum fuse together to form a diploid zygote

9. THANK YOU!