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Question
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.
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Solution
- The placenta is formed of two sets of minute finger-like projections, the villi. One set of villi are given out by the uterine wall and the other set by an extension (allantois) from the embryo.
- Carbon dioxide and urea.
- Oestrogens and progesterone.
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RELATED QUESTIONS
State whether the following statements are TRUE (T) or FALSE (F):
Rewrite of the wrong statements by correcting only one word either at the beginning or at the end of the sentences.
Gestation period in humans is about 380 days.
Complete the following table by writing the name of the structure or the function of the given structure:
| Structure | Function | ||
| 1 | Corpus luteum | 1 | …………… |
| 2 | ……………. | 2 | Produces male gametes in mass |
| 3 | Placental disc | 3 | …………………….. |
| 4 | . ……………. | 4 | Increases the force in uterine contractions during child birth |
| 5 | Umbilical cord | 5 | …………………. |
| 6 | Fallopian tube | 6 | ………………… |
Differentiate between:
Impotency and sterility
The diagram given alongside is that of a developing human foetus in the womb. Study the same and answer the questions that follows:
Name the parts ‘1’ to ‘5’ indicated by guidelines
Give Reasons
The full-grown human embryo respires but does not breathe.
Give Technical Term:
A structure which connects the placenta with the fetus.
Complete the following sentences with appropriate word:
The placenta is ________permeable
Assertion (A): The foetus respires but does not breathe.
Reason (R): The maternal blood supplies oxygen to the foetus through placenta.
Write one sentence using the following term pertaining to reproduction in humans.
Placenta
Does the foetus inside the mother's uterus breathe?
