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प्रश्न
Explain the process of fertilization.
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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.
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संबंधित प्रश्न
Differentiate between the following pair:
Efferent duct and sperm duct
Suppose a normal woman has never borne a child; How many mature eggs would she have produced in her lifetime? Your calculation should be based on two clues-
(a) Eggs are produced at the rate of 1 egg every 28 days (one menstrual cycle)
(b) A woman’s total reproductive period is 13 – 45 years.
Give the appropriate term for the following:
Process of fusion of ovum and sperm.
Name the following:
Fusion of sperm and ovum.
Name two essential structures which take part in fertilization.
Give Reasons
The urethra is also called urinogenital duct.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Give Reasons
The oviduct funnel is lined with cilia.
Differentiate
Isogametes and Heterogametes.
Give a labeled structure of ovum.
Explain the mechanism of fertilization in humans.
What is fertilization?
Identify the function of fertilization membrane.
In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is
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 True or False:
The chromosome number in germ cells producing the gametes are diploid.
In which part of the human female reproductive system do the following events take place?
Fertilization
What are autosomes chromosomes?
Write the specific location of the following:
Acrosome
