MEDIUM
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How many cleavages are completed in 16 celled stage of egg.

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Important Questions on Human Reproduction

EASY
Biology>Reproduction in Organisms>Human Reproduction>Embryo Development
In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
MEDIUM
Biology>Reproduction in Organisms>Human Reproduction>Embryo 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:

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

Write the differences between blastula and morula.

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