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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
Choose the odd one in each of the following:
Sperm; implantation; fertilization; ovum; ovum; after birth.
Differentiate between:
Implantation and pregnancy
Name the following:
Organ producing ovum.
Name the Following
The term used for the mature follicles.
Write the functional activity of the following structure:
Ovary
The development of lactiferous tubules during pregnancy is dependent on ____________.
When both ovaries are removed from rat which hormone is decreased in blood?
When sperm is deposited into the vagina which route does it travel?
Give reason:
Uterine lining becomes thick and spongy after fertilisation.
Sketch and label - Graafian follicle.
