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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 term Gamete.
Name the following:
The fully developed part of the ovary containing a mature egg.
Differentiate between the following pair:
Efferent duct and sperm duct
Choose the odd one in each of the following:
Sperm; implantation; fertilization; ovum; afterbirth
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.
Name the following:
Organ where fertilization occurs.
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
Name (any one) hormone produced by the part labelled '2'.
Give Reasons
A large number of sperms are required for fertilizing one egg.
Differentiate
External fertilization and Internal fertilization.
Differentiate between tubectomy and vasectomy.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Draw a labeled diagram of sperm.
Complete the following sentences with appropriate word:
One egg is normally released from the ovary in the human females after
__________
Answer the following question.
What is capacitation? Give its importance.
Write a short note on fallopian tube.
Give scientific reason.
The new individual produced by sexual reproduction always has the recombined genes of both the parents.
What would be the effect if meiosis did not occur in nature?
Identify the function of fertilization membrane.
Sperms undergo the following changes in the epididymis EXCEPT ______
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:
