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Question
Describe briefly the ways how a mammalian embryo is protected
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Solution
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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RELATED QUESTIONS
Choose the odd one in each of the following :
Relaxin; cervix dilated; amniotic sac ruptures; child birth; follicle.
Given below are the names of certain stages/substances related to reproduction and found in human body. Answer the questions related to them.
Gestation
• What is its meaning?
• How long does it normally last?
Differentiate between:
Follicle and corpus luteum
Name the following:
The structure which connects the placenta and the foetus.
Give Reasons
The full-grown human embryo respires but does not breathe.
Differentiate
Uterus and Urethra.
Differentiate
Fetus and Embryo.
Match the respiratory surfaces to the organisms in which they are found.
| Organ/ cells | Hormones | ||
| (i) | Corpus luteum | (a) | HCG |
| (ii) | Leydig's cells | (b) | Estrogen |
| (iii) | Placenta | (c) | Progesterone |
| (iv) | Graafian follicle | (d) | Testosterone |
Mother's blood flows into the foetus through placenta.
Distinguish between the following pair:
Placenta and umbilical cord
