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प्रश्न
Except endocrine function, what are the other functions of placenta.
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उत्तर
Placenta facilitates the supply of oxygen and nutrients to the embryo. It also removes CO2 and excretory wastes produced by embryo.
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संबंधित प्रश्न
When and where do chorionic villi appear in humans?
During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?
Medically it is advised to all young mothers that breast-feeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.
Mention any two functions of the human placenta.
Which of the following hormones is not secreted by human placenta?
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?
Which of the following hormones is not a secretory product of human placenta?
In the development of the human body, the ectoderm is responsible for the formation of ______.
The early stage human embryo distinctly possesses ______.
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
Subject 2 has a higher level of hormone B, which is ______
Which of the following is not a function of the placenta?
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
At which stage of embryonic development does trophectoderm develop?
Extra-embryonic membranes provide:
Placenta is
Explain the formation of placenta after the implantation in a human female.
Match the columns I and II with reference to weeks of pregnancy and the development of a human embryo. Select the correct option from the choices given below:
| Column I | Column II | ||
| I. | 8 weeks | (P) | Limbs and external genital organs |
| II. | 12 weeks | (Q) | Limbs and digits develop. |
| III. | 20 weeks | (R) | Body hair develops. |
| IV. | 24 weeks | (S) | Eyelids separate. |
During embryogenesis in dicots, the zygote divides into a basal cell and a terminal cell. The basal cell divides repeatedly to produce a structure called suspensor. Carefully observe the image given below and describe the function of cell – A and cell – B of the suspensor.
Zygote
