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During the process of gastrulation in mammals, three primary germ layers are formed. This includes ectoderm, and endoderm.

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Important Questions on Human Reproductive System

EASY
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
The embryo with 8 to 16 blastomeres is called a:
HARD
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
After which month of the embryo development in humans, the growth of the placenta slows down?
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
Distinguish between the blastula and gastrula by giving two points.
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
Explain "Gastrulation".
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development

Write the differences between blastula and morula.

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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
What is embryogenesis? Mention two important events that occur during embryogenesis.
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
What is implantation?
MEDIUM
Biology>Human Reproduction>Human Reproductive System>Fertilization and 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:

EASY
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
Explain the term Implantation.
MEDIUM
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
What is called differentiation?
MEDIUM
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
What will be effect on embryonic development if placenta does not formed after implantation. Explain.
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Biology>Human Reproduction>Human Reproductive System>Fertilization and 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>Human Reproduction>Human Reproductive System>Fertilization and Development
Explain "Implantation".
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
Human embryo is protected by which cavity?
MEDIUM
Biology>Human Reproduction>Human Reproductive System>Fertilization and 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>Human Reproduction>Human Reproductive System>Fertilization and Development
The following question has four choices. Choose the best option.
Eyelids in human foetus separate in:
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
The amnion of mammalian embryo is derived from
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Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
Embryo after the first 8 weeks of development is called _____.
EASY
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
MEDIUM
Biology>Human Reproduction>Human Reproductive System>Fertilization and Development
Morphogenetic movements take place predominantly during the following embryonic stage: