272032
In the process of spermatogenesis, first maturation division is called
1 mitotic division
2 reduction division
3 amitotic division
4 None of the these
Explanation:
(b) The immature male germ cells or primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I which is a reductional division to produce two haploid secondary spermatocytes.
NCERT Page-47 / N-31
Human Reproduction
272033
The LH surge from the anterior pituitary gland
1 occurs just prior to ovulation.
2 occurs just prior to menstruation.
3 stimulates an estrogen surge from the ovaries.
4 is responsible for follicle development in the uterus.
Explanation:
(a) The $\text{LH}$ surge is a peak burst of $\text{LH}$ from the anterior pituitary gland, which causes ovulation. It occurs in the middle of the ovarian cycle and is stimulated by the positive feedback of a high blood level of estrogen that is sustained for 48 to 50 hours. Although FSH and $\text{LH}$ stimulate follicle development at the beginning of a cycle, it is the LH surge that results in the rupture of the dominant follicle from the ovary.
NCERT Page-47 / N-31
Human Reproduction
272034
Which of the following statements about oogenesis is false?
1 The polar bodies degenerate after the second meiotic division.
2 The ovum produced is haploid.
3 The major growth phase of the primary oocyte occurs in prophase-I.
4 The primary oocyte is haploid.
Explanation:
(d) During oogenesis, the primary oocyte is diploid; after the first meiotic division into the secondary oocyte the cell becomes haploid.
NCERT Page-48
Human Reproduction
272035
In humans, male germs cells differentiate into the end of first meiotic division.
1 spermatid
2 spermatogonium
3 secondary spermatocyte
4 primary spermatocyte
Explanation:
(c) Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two equal, haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergoes meiosis II to produce two haploid spermatids. Therefore, total four equal, haploid spermatids are producted after second meiotic division.
NCERT Page-49 / N-31
Human Reproduction
272036
Increased secretion of which hormone start the process of sperm formation at the time of puberty?
1 $\text{GH}$
2 TSH
3 PRL
4 $\text{GnRH}$
Explanation:
(d) Gonadotropin-releasing hormone (GnRH) is released from the anterior pituitary. $\text{GnRH}$ activity is very low during childhood, and is activated at puberty or adolescence. At the puberty increased secretion of $\text{GnRH}$ start the process of sperm formation.
272032
In the process of spermatogenesis, first maturation division is called
1 mitotic division
2 reduction division
3 amitotic division
4 None of the these
Explanation:
(b) The immature male germ cells or primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I which is a reductional division to produce two haploid secondary spermatocytes.
NCERT Page-47 / N-31
Human Reproduction
272033
The LH surge from the anterior pituitary gland
1 occurs just prior to ovulation.
2 occurs just prior to menstruation.
3 stimulates an estrogen surge from the ovaries.
4 is responsible for follicle development in the uterus.
Explanation:
(a) The $\text{LH}$ surge is a peak burst of $\text{LH}$ from the anterior pituitary gland, which causes ovulation. It occurs in the middle of the ovarian cycle and is stimulated by the positive feedback of a high blood level of estrogen that is sustained for 48 to 50 hours. Although FSH and $\text{LH}$ stimulate follicle development at the beginning of a cycle, it is the LH surge that results in the rupture of the dominant follicle from the ovary.
NCERT Page-47 / N-31
Human Reproduction
272034
Which of the following statements about oogenesis is false?
1 The polar bodies degenerate after the second meiotic division.
2 The ovum produced is haploid.
3 The major growth phase of the primary oocyte occurs in prophase-I.
4 The primary oocyte is haploid.
Explanation:
(d) During oogenesis, the primary oocyte is diploid; after the first meiotic division into the secondary oocyte the cell becomes haploid.
NCERT Page-48
Human Reproduction
272035
In humans, male germs cells differentiate into the end of first meiotic division.
1 spermatid
2 spermatogonium
3 secondary spermatocyte
4 primary spermatocyte
Explanation:
(c) Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two equal, haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergoes meiosis II to produce two haploid spermatids. Therefore, total four equal, haploid spermatids are producted after second meiotic division.
NCERT Page-49 / N-31
Human Reproduction
272036
Increased secretion of which hormone start the process of sperm formation at the time of puberty?
1 $\text{GH}$
2 TSH
3 PRL
4 $\text{GnRH}$
Explanation:
(d) Gonadotropin-releasing hormone (GnRH) is released from the anterior pituitary. $\text{GnRH}$ activity is very low during childhood, and is activated at puberty or adolescence. At the puberty increased secretion of $\text{GnRH}$ start the process of sperm formation.
272032
In the process of spermatogenesis, first maturation division is called
1 mitotic division
2 reduction division
3 amitotic division
4 None of the these
Explanation:
(b) The immature male germ cells or primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I which is a reductional division to produce two haploid secondary spermatocytes.
NCERT Page-47 / N-31
Human Reproduction
272033
The LH surge from the anterior pituitary gland
1 occurs just prior to ovulation.
2 occurs just prior to menstruation.
3 stimulates an estrogen surge from the ovaries.
4 is responsible for follicle development in the uterus.
Explanation:
(a) The $\text{LH}$ surge is a peak burst of $\text{LH}$ from the anterior pituitary gland, which causes ovulation. It occurs in the middle of the ovarian cycle and is stimulated by the positive feedback of a high blood level of estrogen that is sustained for 48 to 50 hours. Although FSH and $\text{LH}$ stimulate follicle development at the beginning of a cycle, it is the LH surge that results in the rupture of the dominant follicle from the ovary.
NCERT Page-47 / N-31
Human Reproduction
272034
Which of the following statements about oogenesis is false?
1 The polar bodies degenerate after the second meiotic division.
2 The ovum produced is haploid.
3 The major growth phase of the primary oocyte occurs in prophase-I.
4 The primary oocyte is haploid.
Explanation:
(d) During oogenesis, the primary oocyte is diploid; after the first meiotic division into the secondary oocyte the cell becomes haploid.
NCERT Page-48
Human Reproduction
272035
In humans, male germs cells differentiate into the end of first meiotic division.
1 spermatid
2 spermatogonium
3 secondary spermatocyte
4 primary spermatocyte
Explanation:
(c) Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two equal, haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergoes meiosis II to produce two haploid spermatids. Therefore, total four equal, haploid spermatids are producted after second meiotic division.
NCERT Page-49 / N-31
Human Reproduction
272036
Increased secretion of which hormone start the process of sperm formation at the time of puberty?
1 $\text{GH}$
2 TSH
3 PRL
4 $\text{GnRH}$
Explanation:
(d) Gonadotropin-releasing hormone (GnRH) is released from the anterior pituitary. $\text{GnRH}$ activity is very low during childhood, and is activated at puberty or adolescence. At the puberty increased secretion of $\text{GnRH}$ start the process of sperm formation.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Human Reproduction
272032
In the process of spermatogenesis, first maturation division is called
1 mitotic division
2 reduction division
3 amitotic division
4 None of the these
Explanation:
(b) The immature male germ cells or primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I which is a reductional division to produce two haploid secondary spermatocytes.
NCERT Page-47 / N-31
Human Reproduction
272033
The LH surge from the anterior pituitary gland
1 occurs just prior to ovulation.
2 occurs just prior to menstruation.
3 stimulates an estrogen surge from the ovaries.
4 is responsible for follicle development in the uterus.
Explanation:
(a) The $\text{LH}$ surge is a peak burst of $\text{LH}$ from the anterior pituitary gland, which causes ovulation. It occurs in the middle of the ovarian cycle and is stimulated by the positive feedback of a high blood level of estrogen that is sustained for 48 to 50 hours. Although FSH and $\text{LH}$ stimulate follicle development at the beginning of a cycle, it is the LH surge that results in the rupture of the dominant follicle from the ovary.
NCERT Page-47 / N-31
Human Reproduction
272034
Which of the following statements about oogenesis is false?
1 The polar bodies degenerate after the second meiotic division.
2 The ovum produced is haploid.
3 The major growth phase of the primary oocyte occurs in prophase-I.
4 The primary oocyte is haploid.
Explanation:
(d) During oogenesis, the primary oocyte is diploid; after the first meiotic division into the secondary oocyte the cell becomes haploid.
NCERT Page-48
Human Reproduction
272035
In humans, male germs cells differentiate into the end of first meiotic division.
1 spermatid
2 spermatogonium
3 secondary spermatocyte
4 primary spermatocyte
Explanation:
(c) Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two equal, haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergoes meiosis II to produce two haploid spermatids. Therefore, total four equal, haploid spermatids are producted after second meiotic division.
NCERT Page-49 / N-31
Human Reproduction
272036
Increased secretion of which hormone start the process of sperm formation at the time of puberty?
1 $\text{GH}$
2 TSH
3 PRL
4 $\text{GnRH}$
Explanation:
(d) Gonadotropin-releasing hormone (GnRH) is released from the anterior pituitary. $\text{GnRH}$ activity is very low during childhood, and is activated at puberty or adolescence. At the puberty increased secretion of $\text{GnRH}$ start the process of sperm formation.
272032
In the process of spermatogenesis, first maturation division is called
1 mitotic division
2 reduction division
3 amitotic division
4 None of the these
Explanation:
(b) The immature male germ cells or primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I which is a reductional division to produce two haploid secondary spermatocytes.
NCERT Page-47 / N-31
Human Reproduction
272033
The LH surge from the anterior pituitary gland
1 occurs just prior to ovulation.
2 occurs just prior to menstruation.
3 stimulates an estrogen surge from the ovaries.
4 is responsible for follicle development in the uterus.
Explanation:
(a) The $\text{LH}$ surge is a peak burst of $\text{LH}$ from the anterior pituitary gland, which causes ovulation. It occurs in the middle of the ovarian cycle and is stimulated by the positive feedback of a high blood level of estrogen that is sustained for 48 to 50 hours. Although FSH and $\text{LH}$ stimulate follicle development at the beginning of a cycle, it is the LH surge that results in the rupture of the dominant follicle from the ovary.
NCERT Page-47 / N-31
Human Reproduction
272034
Which of the following statements about oogenesis is false?
1 The polar bodies degenerate after the second meiotic division.
2 The ovum produced is haploid.
3 The major growth phase of the primary oocyte occurs in prophase-I.
4 The primary oocyte is haploid.
Explanation:
(d) During oogenesis, the primary oocyte is diploid; after the first meiotic division into the secondary oocyte the cell becomes haploid.
NCERT Page-48
Human Reproduction
272035
In humans, male germs cells differentiate into the end of first meiotic division.
1 spermatid
2 spermatogonium
3 secondary spermatocyte
4 primary spermatocyte
Explanation:
(c) Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two equal, haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergoes meiosis II to produce two haploid spermatids. Therefore, total four equal, haploid spermatids are producted after second meiotic division.
NCERT Page-49 / N-31
Human Reproduction
272036
Increased secretion of which hormone start the process of sperm formation at the time of puberty?
1 $\text{GH}$
2 TSH
3 PRL
4 $\text{GnRH}$
Explanation:
(d) Gonadotropin-releasing hormone (GnRH) is released from the anterior pituitary. $\text{GnRH}$ activity is very low during childhood, and is activated at puberty or adolescence. At the puberty increased secretion of $\text{GnRH}$ start the process of sperm formation.