EASY
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After implantation, the uterine mucosa undergoes profound changes and is called decidua. Which part of decidua is present between the embryo and the lumen of uterus?

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Important Questions on Human Reproduction

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
What is embryogenesis? Mention two important events that occur during embryogenesis.
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:

MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Which ONE of the following statements is CORRECT about placenta?
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What is quickening? In the human embryonic stage, which organs are formed during the third to sixth week of gestation?
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
In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
HARD
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
List the three hormones produced in women only during pregnancy. What happens to the levels of oestrogen and progesterone during pregnancy?
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Describe the formation of the placenta during the pregnancy.
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Explain the term Implantation.
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
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
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What is implantation?
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
Explain "Implantation".
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
Embryo after the first 8 weeks of development is called _____.
MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans
What is called differentiation?
EASY
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans

Write the differences between blastula and morula.

MEDIUM
Biology>Reproduction>Human Reproduction>Pregnancy and Placenta Formation in Humans

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
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?