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प्रश्न
The diagram given below is that of a developing human foetus in the womb. Study the same and then answer the questions that follow:
- Name the parts '1' to '5' indicated by guidelines.
- What term is given to the period of development of the foetus in the womb?
- How many days does the foetus take to be fully developed?
- Mention two functions of the parts labelled ‘2’ other than its endocrine function.
- Name the hormone (anyone) produced by the part labelled ‘2’.
- What is the function of the part marked ‘3’?
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उत्तर
-
- Umbilical cord
- Placenta
- Amniotic fluid
- Cervix
- Uterus wall
- Gestation period.
- 280 days.
- It provides nutrition and the exchange of respiratory gases by diffusion.
- Prevents foetuses from jerks and shocks. It also prevents the foetus from sticking to the uterine wall.
Notes
Student should refer their answer according to their question
संबंधित प्रश्न
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Hyaluronidase.
- Is it an enzyme or simply a protein?
- What is its function?
The circulatory system of the fetus and that of the mother are never connected directly. What are the advantages?
What changes occur at the time of birth?
Differentiate
Fetus and Embryo.
Complete the following sentences with appropriate word:
The expulsion of the fetus from the body to the mother in a human female is called __________.
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 |
Assertion (A): The foetus respires but does not breathe.
Reason (R): The maternal blood supplies oxygen to the foetus through placenta.
List the substances which the foetus receives from the mother through placenta.
Amniotic fluid serves to provide oxygen to the foetus.
Distinguish between the following pair:
Placenta and umbilical cord
