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Q. No.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: 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: Menstrual Cycle: Pre Ovulatory Phase | Menstrual Cycle: Luteal Phase | 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: Seminiferous Tubules & Spermatogenesis | Spermiogenesis/Sperm Structure/Hormonal Regulation |
82%
From NCERT
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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: 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: Embryonic Development till Gastrulation | Fertilization | 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: Fetal Development & Parturition |
82%
From NCERT
NEET - 2013
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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: Sex Determination in Humans |
84%
From NCERT
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Spermatogenesis starts at the age of puberty due to a significant increase in the secretion of:
1. GnRH
2. FSH
3. LH
4. Testosterone
1. GnRH
2. FSH
3. LH
4. Testosterone
Subtopic: Seminiferous Tubules & Spermatogenesis | Spermiogenesis/Sperm Structure/Hormonal Regulation |
78%
From NCERT
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The primary follicles in the ovary grow to become a fully mature Graafian follicle and simultaneously the endometrium of the uterus regenerates through proliferation during the:
| 1. | menstrual phase of the menstrual cycle |
| 2. | follicular phase of the menstrual cycle |
| 3. | ovulatory phase of the menstrual cycle |
| 4. | luteal phase of the menstrual cycle |
Subtopic: Menstrual Cycle: Pre Ovulatory Phase |
84%
From NCERT
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Identify the incorrect statement:
| 1. | The seminiferous tubules of the testis open into the vasa efferentia through the rete testis. |
| 2. | The vasa efferentia leave the testis and open into the epididymis located along the posterior surface of each testis. |
| 3. | The epididymis leads to the vas deferens that ascend to the abdomen and loop over the urinary bladder. |
| 4. | The epididymis receives a duct from the seminal vesicle and opens into the urethra as the ejaculatory duct. |
Subtopic: Male Reproductive System |
71%
From NCERT
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