MEDIUM
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The embryogenesis is the process of the development of an embryo from the zygote. During this process zygote undergoes:

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Important Questions on Human Reproduction

EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans

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:

HARD
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
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?
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Embryo after the first 8 weeks of development is called _____.
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Explain the term Implantation.
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What is called differentiation?
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Morphogenetic movements take place predominantly during the following embryonic stage:
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Human embryo is protected by which cavity?
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What is implantation?
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What will be effect on embryonic development if placenta does not formed after implantation. Explain.
HARD
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
After which month of the embryo development in humans, the growth of the placenta slows down?
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
The substance that helps in relaxing the muscles and ligaments of pelvic organs during parturition:
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Distinguish between the blastula and gastrula by giving two points.
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans

Write the differences between blastula and morula.

EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
The embryo with 8 to 16 blastomeres is called a:
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Explain "Gastrulation".
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What is embryogenesis? Mention two important events that occur during embryogenesis.
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Explain "Implantation".
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Describe pregnancy and embryonic development.
HARD
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans

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