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प्रश्न
Describe briefly the ways how a mammalian embryo is protected
उत्तर
The mammalian embryo is protected by two sacs:
(a) The chorion
(b) The amnion, which contains the amniotic fluid to protect the embryo from shocks. The embryo-is also protected by the thick, muscular wall of the uterus.
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संबंधित प्रश्न
Choose the odd one in each of the following :
Relaxin; cervix dilated; amniotic sac ruptures; child birth; follicle.
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 | 1 | An embryo which looks like human baby |
| b | Gestation | 2 | Luteinizing hormone |
| c | Menopause | 3 | ovum producing cells |
| d | Foetus | 4 | complete stoppage of menstrual cycle |
| e | Oogenesis | 5 | spermatozoa |
| f | Ovulation | 6 | Complete stoppage of menstrual cycle. |
| 7 | Time taken by a fertilized egg till the delivery of baby |
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Placenta
- What are the two sources that form placenta?
- Name any two main substances which pass from foetus to mother through placenta.
- Name any two hormones it produces.
How is Placenta formed? What are its functions?
Give Technical Term:
The part in the uterus which is concerned with the supply of nutrition from the mother to the fetus.
During pregnancy, which hormones are secreted by the placenta?
In human beings, the placenta is formed by ______.
Name the following:
Two hormones secreted from placenta.
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Foetus.
- Where is it contained?
- How does it differ from embryo?
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Morula.
- What is this stage?
- Name the stage which comes next to it?
