Biology
Answer
Difference between amnion and allantois —
| Amnion | Allantois |
|---|---|
| Amnion is the innermost thin membrane that develops around the embryo. Amniotic fluid fills the space between the amnion and the embryo. | Allantois is another membrane that surrounds the developing embryo. It is an extension of the posterior wall of the yolk sac and lies between the amnion and the chorion. |
| Amnion protects the embryo from physical damage and keeps an even pressure all around the embryo. | Allantois forms one of the villi of placenta and thus helps in the exchange of gases and handles waste from the developing embryo. |
Related Questions
Given below is the outline of the male reproductive system. Name the parts labelled 1 to 8. Also name the corresponding structure of part (4) in the female reproductive system.
The diagram below is that of a developing human foetus in the womb. Study the same and answer the questions that follow:
(a) Name the parts '1' to '5' indicated by guidelines.
(b) What term is given to the period of development of the foetus in the womb?
(c) How many days does the foetus take to be fully developed?
(d) Mention two functions of the parts labelled '2' other than its endocrine functions.
(e) Name any one hormone produced by the part labelled '2'.
The figure given below is the human female reproductive system. Study the same and answer the following questions.
(a) Label the guidelines 1 to 6 shown in the figure.
(b) What is the normal gestation period in human ?
(c) Where are the sperms released during coitus ?
(d) Write two important functions of part 2.
(e) Mention the technical term for the fixing of developing zygote to the uterine wall.
The diagram below represents two reproductive cells A and B. Study the same and then answer the questions that follow:
(a) Identify the reproductive cells A and B
(b) Name the specific part of the reproductive system where the above cells are produced.
(c) Where in the female reproductive system do these cells unite?
(d) Name the main hormone secreted by the (1) ovary (2) testes.
(e) Name an accessory gland found in the male reproductive system and state the function of its secretion.