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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Except endocrine function, what are the other functions of placenta. - Biology

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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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अध्याय 3: Human Reproduction - SHORT ANSWER [पृष्ठ २२]

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एनसीईआरटी एक्झांप्लर Biology [English] Class 12
अध्याय 3 Human Reproduction
SHORT ANSWER | Q 5. | पृष्ठ २२

संबंधित प्रश्न

When and where do chorionic villi appear in humans?


Arrange the following hormones in sequence of their secretion in a pregnant woman. Mention their source and the function they perform:

hcG, LH, FSH, Relaxin


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Eyelids in human foetus separate in :


Explain Rh factor incompatibility during pregnancy.


Mention any two functions of the human placenta.


Which of the following hormones is not secreted by human placenta?


Eye lens is formed from ______.


Which of the following hormones is not a secretory product of human placenta?


The early stage human embryo distinctly possesses ______.


The concentration of which of the following substances will decrease in the maternal blood as it flows from embryo to placenta through the umbilical cord?

The human foetus within the uterus

  1. Oxygen
  2. Amino Acids
  3. Carbon dioxide
  4. Urea

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 preganancy.

The solid mass of cells with 16 blastomeres is called ______


The secondary sexual characters develop in females because:


hCG is secreted by ______


Placenta is


Assertion: Functional ADA cDNA genes must be inserted in the lymphocytes at the early embryonic stage.

Reason: Cells in the embryonic stage are mortal, differentiated and easy to manipulate.


Explain the formation of placenta after the implantation in a human female.


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


The diagram given below shows the early embryonic stages of fish, reptiles, birds and humans. Though adult reptiles, birds and mammals breathe air, their embryos possess gills. How does this fact support evolution?


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