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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.
APPEARS IN
संबंधित प्रश्न
The middle piece of sperm provides:
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:
Fertilization occurs in the vagina.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
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?
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
Mention two functions of the parts labelled '2' other than its endocrine functions.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Complete the following sentences with appropriate word:
Fertilization of the human egg by the sperm normally occurs in the_______
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The process of fusion of the sperm nucleus and the egg nucleus is termed implantation.
Describe the process of fertilization.
Which parts are converted into Seed and fruit respectively after fertilization?
What is fertilization?
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
What is sex chromosomes?
Name the parts of fallopian tubes.
Fertilization takes place in ______.
How long after ovulation can the ovum be fertilized?
What is the duration of capacitation in the female genital tract?
What is the term used to describe the fusion product of male and female pronuclei?
What is the diameter of the human ovum?
