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Chorion is composed of

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Important Questions on Human Reproduction

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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development

Write the differences between blastula and morula.

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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
From an early amphibian embryo the cells that would give rise to skin in adults were transplanted into the developing brain region of another embryo. The transplanted cells developed into brain tissue in the recipient embryo. What do you infer from this experiment?
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Which ONE of the following statements is CORRECT about placenta?
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
What is embryogenesis? Mention two important events that occur during embryogenesis.
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Distinguish between the blastula and gastrula by giving two points.
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Assertion (A): During the formation of placenta, some layers of uterus are eroded and during parturition, extensive haemorrhage occurs
Reason (R): Placenta of man is described as haemo endothelial placenta
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development

Given below are statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Endometrium is necessary for implantation of blastocyst.

Reason R: In the absence of fertilization, the corpus luteum degenerates  that causes  disintegration of endometrium.

In the light of the above statements, choose the correct answer from the options given below:

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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development

Match the following columns and select the correct option:-

Column-I Column-II
(a) Ovary (i) Human chorionic gonadotropin
(b) Placenta (ii) Estrogen & Progesterone
(c) Corpus luteum (iii) Androgens
(d) Leydig cells (iv) Progesterone only
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
What will be effect on embryonic development if placenta does not formed after implantation. Explain.
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Hormones secreted by the placenta to maintain pregnancy are
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Explain "Implantation".
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
After which month of the embryo development in humans, the growth of the placenta slows down?
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
What is quickening? In the human embryonic stage, which organs are formed during the third to sixth week of gestation?
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development

Match the following:

  List I   List II
A Totipotent cell I Haemopoietic stem cells
B Pluripotent cell II Muscle stem cell
C Multipotent cell III 8 cell stage blastocyst
D Unipotent cell IV Inner cell mass
    V Mast cell
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Morphogenetic movements take place predominantly during the following embryonic stage:
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
The embryo with 8 to 16 blastomeres is called a:
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Select the correct option describing gonadotropin activity in a normal pregnant female:
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Biology>Reproduction>Human Reproduction>Pregnancy and Embryonic Development
Several hormones like hCG, hPL, estrogen, progesterone are produced by