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
When pregnancy does not occur, the life of corpus luteum is about ______.
Differentiate between the following pair:
Efferent duct and sperm duct
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 Reasons
The urethra is also called urinogenital duct.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Differentiate
Isogametes and Heterogametes.
Complete the following sentences with appropriate word:
___________ hormones are secreted by the interstitial cells.
Complete the following sentences with appropriate word:
One egg is normally released from the ovary in the human females after
__________
Write the functional activity of the following structure:
Prostate gland
Write the functional activity of the following structure:
Seminal vesicles
Identify the function of fertilization membrane.
Sperms undergo the following changes in the epididymis EXCEPT ______
Which of the following is the first cell of human life?
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:
What is the meiotic stage of the ovum at the time of ovulation?
Which ions enter the sperm during capacitation, causing rapid whiplash movements of the tail?
Which structure sweeps the ovum into the fallopian tube after ovulation?
What is the diameter of the human ovum?
How are ova classified in terms of yolk content?
