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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
State whether the following statement is true (T) or false (F):
A fertilised egg becomes a seed.
Define the term Gamete.
Mention the function of Seeds.
Differentiate between the following pair:
Efferent duct and sperm duct
What is fertilization? Name the site of fertilization in the human females.
Give Reasons
The acrosome of sperm secretes an enzyme called hyaluronidase at the time of fertilization
Give Technical Term:
What term is used for the production and maturation of sperms in the testes?
Give Technical Term:
The place where fertilization occurs in the female reproductive system.
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 single cell.
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.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Fertilization is the product of the egg nucleus and the sperm nucleus.
Write a short note on fallopian tube.
In markets, eggs of birds are available but never eggs of dogs. why?
State whether the following statement is True or False. If false, correct the statement:
The eggs of fish are covered by hard shells for protection.
What are autosomes chromosomes?
Give any four significances of fertilization in humans.
Explain tubectomy and vasectomy.
Name the three main regions of the human sperm, and briefly mention the function of each.
Match the items in column I with those in column II and write down the matching pairs (some may not match).
| Column I | Column II | ||
| (a) | Acrosome | (i) | An embryo which looks like human baby. |
| (b) | Gestation | (ii) | Luteinizing hormone |
| (c) | Menopause | (iii) | Ovum producing cells. |
| (d) | Foetus | (iv) | Semen |
| (e) | Oogenesis | (v) | Spermatozoa |
| (f) | Ovulation | (vi) | Complete stoppage of menstrual cycle. |
| (vii) | Time taken by a fertilised egg till the delivery of baby. |
