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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
Define the Zygote.
When pregnancy does not occur, the life of corpus luteum is about ______.
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.
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.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
Name the following:
Fusion of sperm and ovum.
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
Write in sequence the regions in which a mature sperm travels from the seminiferous tubules up to the urethral opening?
Explain the Term Vas deferens.
Give Technical Term:
In how many weeks fetus development is completed?
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:
Sperm is a highly motile male gamete.
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.
Write the functional activity of the following structure:
Seminal vesicles
Give scientific reason.
The new individual produced by sexual reproduction always has the recombined genes of both the parents.
What is fertilization?
In markets, eggs of birds are available but never eggs of dogs. why?
On which day of the menstrual cycle does ovulation typically occur?
What is the duration of capacitation in the female genital tract?
What is the diameter of the human ovum?
