The ratio of maternal to foetal blood flowing through umbilical cord of a mammalian embryo is
1. 50 : 50
2. 75 : 25
3. 0 : 100
4. 100 : 0
Subtopic: Â Fetal Development & Parturition |
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Which of the following is true with respect to the most variable phase of menstrual cycle with respect to hormone?
1. Equal level of LH and FSH
2. Level of estrogen and progesterone is almost same
3. Level of LH is lower than FSH
4. Level of estrogen is higher than progesterone
1. Equal level of LH and FSH
2. Level of estrogen and progesterone is almost same
3. Level of LH is lower than FSH
4. Level of estrogen is higher than progesterone
Subtopic: Â Menstrual Cycle: Pre Ovulatory Phase |Â Menstrual Cycle: Luteal Phase |Â Introduction to Menstrual Cycle |
 58%
From NCERT
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Read the following statements carefully and choose the option with only correct statements.
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
| (a) | Spermatogonia produce sperm cells by spermatogenesis that begins at puberty. |
| (b) | All spermatogonia periodically undergo meiosis. |
| (c) | A primary spermatocyte completes first meiotic division during embryonic development. |
| (d) | The secondary spermatocytes have only 23 chromosomes each. |
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
 82%
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| Assertion (A): | During pregnancy, the level of several hormones like estrogens, progestogens, cortisol, prolactin, thyroxine, etc are increased several folds in the maternal blood. |
| Reason (R): | Increased production of these hormones is essential for supporting the foetal growth, metabolic changes in the mother, and maintenance of pregnancy. |
| 1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Â Embryonic Development till Gastrulation |
 70%
From NCERT
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How many statements given below are correct?
1. 2
2. 1
3. 4
4. 3
| (i) | Relaxin is secreted by the ovary in the later phase of pregnancy. |
| (ii) | Inner cell mass differentiates into ectoderm and endoderm just before implantation. |
| (iii) | Implantation leads to pregnancy. |
| (iv) | Embryo with 8 to 16 blastomeres is called morula. |
2. 1
3. 4
4. 3
Subtopic: Â Embryonic Development till Gastrulation |Â Fertilization |Â Implantation |
 66%
From NCERT
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The foetal ejection reflex in humans triggers the release of:
1. oxytocin from foetal pituitary
2. human Chorionic Gonadotropin (hCG) from placenta
3. human Placental Lactogen (hPL) from placenta
4. oxytocin from maternal pituitary
1. oxytocin from foetal pituitary
2. human Chorionic Gonadotropin (hCG) from placenta
3. human Placental Lactogen (hPL) from placenta
4. oxytocin from maternal pituitary
Subtopic: Â Fetal Development & Parturition |
 83%
From NCERT
NEET - 2013
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Diagrammatic view of male reproductive system, an unpaired gland is represented by the letter:
1. A
2. B
3. C
4. D
1. A
2. B
3. C
4. D
Subtopic: Â Male Reproductive System |
 79%
From NCERT
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In the diagrammatic section of the ovary shown below:
I. A is a tertiary follicle showing a fluid filled cavity called as blastocoel.
II. B acts as a temporary endocrine gland that produces large amounts of hCG.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I. A is a tertiary follicle showing a fluid filled cavity called as blastocoel.
II. B acts as a temporary endocrine gland that produces large amounts of hCG.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Ovary |Â Introduction to Menstrual Cycle: 1 |Â Menstrual Cycle: Pre Ovulatory Phase |Â Menstrual Cycle: Luteal Phase |Â Implantation |
 65%
From NCERT
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Assertion (A): In human males, 50 percent of sperms carry the X chromosome while the other 50 percent carry the Y.
Reason (R): Human males have XY sex chromosomes.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason (R): Human males have XY sex chromosomes.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Â Sex Determination in Humans |
 84%
From NCERT
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| Assertion (A): | Spermiation takes place in epididymis. |
| Reason (R): | Sertoli cells remain attached to spermatozoa in epididymis. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| 3. | (A) is true, but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Seminiferous Tubules & Spermatogenesis |Â Spermiogenesis/Sperm Structure/Hormonal Regulation |
 74%
From NCERT
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