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प्रश्न
Explain the process of fertilization.
उत्तर
Process of fertilization in humans:
- Formation of zygote by union of sperm and ovum is called as fertilization.
- Fertilization is internal in humans. Semen is ejaculated in vagina during copulation.
- Sperms, in the numbers of few millions, start their journey by the route of vagina – uterus – oviduct.
- One of those few million sperms fertilizes the only ovum present in the oviduct.
Process of fertilization in plants:
- Stigma becomes sticky during pollination.
- The pollen grain germinates over the stigma and gives rise to pollen tube.
- Pollen tube carries two male gametes which are released near egg cell present in the embryo sac.
- One male gamete fuses with a female gamete giving rise to zygote. The second male gamete fuses with two polar nuclei giving rise to endosperm. This is called as double fertilization.
APPEARS IN
संबंधित प्रश्न
Mention the function of Seeds.
Name the following:
The fully developed part of the ovary containing a mature egg
The middle piece of sperm provides:
Rewrite the terms in the correct order so as to be in a logical sequence.
coitus, ovum, Sperm, sperm duct, urethra, Vagina.
Differentiate between:
Semen and sperm
State whether the following statement is true or false:
Fertilization occurs in the vagina.
Rewrite the correct statement by changing the last one word if these statement is false.
Pregnancy in women can be prevented by the method of vasectomy.
Name two essential structures which take part in fertilization.
Name the female sex hormones and structures which secrete them.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Give Technical Term:
In how many weeks fetus development is completed?
Write the functional activity of the following structure:
Prostate gland
Write the functional activity of the following structure:
Seminal vesicles
Multiple choice question.
In human female, the fertilized egg gets implanted in uterus _______.
Identify the function of fertilization membrane.
In markets, eggs of birds are available but never eggs of dogs, why?
The eggs of frogs do not have shells for protection, yet they are safe in water, how?
State whether the following statement is True or False. If false, correct the statement :
External fertilisation can occur both in water and on land.
State whether the following statement is True or False. If false, correct the statement :
Human egg has a head, middle piece and tail.
Name the parts of fallopian tubes.
