Advertisements
Advertisements
प्रश्न
Explain the process of fertilization.
Advertisements
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
Define the term Gamete.
Given below is a portion of the diagram to show the diagrammatic highly magnified view of a single human sperm. Complete the diagram to show its normal structure.
State whether the following statement is true or false:
Gestation in humans is completed in about 380 days.
One egg is released from each of the two ovaries every month.
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.
Choose the correct answer:
Virgin birth is called ______________
Name the following:
Virgin birth
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
What term is given to the period of development of the foetus in the womb?
Differentiate
Isogametes and Heterogametes.
Give a labeled structure of ovum.
Give Technical Term:
How much semen is discharged per ejaculation in a man?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Sperm is a highly motile male gamete.
Which parts are converted into Seed and fruit respectively after fertilization?
What would be the effect if meiosis did not occur in nature?
State whether the following statement is True or False. If false, correct the statement:
Human egg has a head, middle piece and tail.
What is sex chromosomes?
What are the functions of each hormone in the neurohypophyseal hormone?
Fertilization takes place in ______.
What are the potential drawbacks in adoption of the IVF method?
- High fatality risk to mother.
- Expensive instruments and reagents.
- Husband/wife necessary for being donors.
- Less adoption of orphans.
- Not available in India.
- Possibility that the early embryo does not survive.
Choose the correct answer from the options given below:
