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प्रश्न
Why is zona pellucid retained around the egg till it reaches the uterus?
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उत्तर
Zona pellucida prevents the implantation of the blastocyst at an abnormal site such as a fallopian tube and it keeps trophoblast cells unexposed till it reaches the uterus. Hence, zona pellucida is retained around the egg until it reaches the uterus.
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संबंधित प्रश्न
Name the following:
The organ of female in which the foetus develops.
Name the Following
The female copulatory organ in humans.
Which one the following is a part of external genitalia of a female human being?
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
If the peak of Hormone A does not appear in the study for Subject 1, which of the following statement is true?
Read the following and answer from given below:
During copulation, semen is released by the penis into the vegina. The motile sperms swim rapidly, fuse with the ovum in the ampullary region, resulting in fertilization. The haploid nucleus of sperm fuses with that of the ovum to form a diploid zygote.
Select the correct sequence of various physical and chemical events that take place during fertilisation.
P. Fusion of cortical granules with the plasma membrane of secondary oocyte.
Q. Formation of fertilization cone to receive sperm.
R. Release of sperm lysin from acrosome.
S. Mixing up of chromosomes of a sperm and an ovum.
Anterior lobe of pituitary secretes:
One mature ovum is released once every ______ days.
Female reproductive organs and associated functions are given below in column A and B. Fill the blank boxes.
| Column A | Column B |
| Ovaries | Ovulation |
| Oviduct | a |
| b | Pregnancy |
| Vagina | Birth |
Give reason:
Uterine lining becomes thick and spongy after fertilisation.
Distinguish between the following pair:
Spermatogenesis and oogenesis
