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Standard XII
Biology
Importance of Placenta
Question

Which one of the following statements is correct about placenta?
  1. Placenta is permeable to all bacteria.
  2. Oxygen and carbon dioxide cannot diffuse through the placenta.
  3. Waste products diffuse out of placenta into maternal blood.
  4. Placenta does not secrete human chorionic gonadotropins.

A
Placenta does not secrete human chorionic gonadotropins.
B
Placenta is permeable to all bacteria.
C
Oxygen and carbon dioxide cannot diffuse through the placenta.
D
Waste products diffuse out of placenta into maternal blood.
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Solution
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Placenta is an organ that develops during pregnancy. It is attached to the wall of uterus. It provides oxygen and nutrients to foetus and removes carbon dioxide and other waste produces from foetus' blood into maternal blood. It is attached to foetus via umbilical cord. It protects foetus from all bacteria as it is impermeable to bacteria. It also secretes human chorionic gonadotropin hormone.
Thus, the correct answer is option C.

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Q1
Which one of the following hormone is not secreted by human chorionic placenta?

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Q2
Which of the following hormones is not a secretion product of human placenta?
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Q3
Considering the following:
1) Endothellium of foetal blood capillaries
2) Connective tissues surrounding foetal blood capillaries
3) Chorionic epithelium
4) Maternal epithelium
5) Connective tissue surrounding maternal blood capillaries
6) Endothelium of maternal blood capilaries
In the case of humans, the placenta comprises which of the above?
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Q4
The placenta is an organ that develops in a mother's uterus during pregnancy. Placenta provides oxygen and nutrients to the growing foetus and removes waste products from foetal blood. What kind of membrane will enable placenta to carry out its function?
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Q5
State whether the following statements are true or false .
The placenta in humans is the true placenta in which foetal and maternal parts can be easily separated without any bleeding.
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