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प्रश्न
Describe briefly the ways how a mammalian embryo is protected
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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
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 |
Name and describe very briefly, the stages in the development of human embryo.
Mention three functions of the placenta.
What changes occur at the time of birth?
Give Technical Term:
The part in the uterus which is concerned with the supply of nutrition from the mother to the fetus.
Complete the following sentences with appropriate word:
The placenta is ________permeable
Complete the following sentences with appropriate word:
The embryo inside the uterus is protected from jerks or mechanical shocks by ________
Write the functional activity of the following structure:
Placenta
During pregnancy, which hormones are secreted by the placenta?
List the substances which the foetus receives from the mother through placenta.
