Solution- Human Reproduction Test-2 Notes - Class 12

Class 12: Solution- Human Reproduction Test-2 Notes - Class 12

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 Page 1


CBSE TEST PAPER-09 
CLASS - XII BIOLOGY (Human Reproduction) 
[ANSWERS] 
Ans1. Ampulla (fallopian tube). 
Ans2. Acrosome contains enzymes e.g. hyaluronidase that helps in dissolving membrane of 
ovum.  
Ans3. Trophoblast. 
Ans4. After ovulation, the graffian follicle ruptures & forms corpus luteum. Corpus luteum 
functions as endocrine glands as they secrete progesterone & estrogen in large 
quantities.  
Ans5. Leydig cells or interstitial cells are located in between the sominiferous tubules. 
Leydig cells secrete male sex hormone TESTOSTERONE which promotes 
development of accessory glands & control male secondary sexual characters.  
Ans6. 
Ans7. Spermatogenesis consists of two phases:- 
I. FORMATIDN OF SPERMATIDS :- It further consist of 3 phases 
Page 2


CBSE TEST PAPER-09 
CLASS - XII BIOLOGY (Human Reproduction) 
[ANSWERS] 
Ans1. Ampulla (fallopian tube). 
Ans2. Acrosome contains enzymes e.g. hyaluronidase that helps in dissolving membrane of 
ovum.  
Ans3. Trophoblast. 
Ans4. After ovulation, the graffian follicle ruptures & forms corpus luteum. Corpus luteum 
functions as endocrine glands as they secrete progesterone & estrogen in large 
quantities.  
Ans5. Leydig cells or interstitial cells are located in between the sominiferous tubules. 
Leydig cells secrete male sex hormone TESTOSTERONE which promotes 
development of accessory glands & control male secondary sexual characters.  
Ans6. 
Ans7. Spermatogenesis consists of two phases:- 
I. FORMATIDN OF SPERMATIDS :- It further consist of 3 phases 
i) Multiplication phase :- undifferentiated germ cells undergo repeated division
to produce sperm mother cell or spermatogonia.
ii) Growth phase :- Spermatogonia increase in volume &  is now called PRIMARY
SPERMATOCYTES.
iii) Maturation phase: - primary spermatocyte undergoes meiosis I to produce
small size haploid secondary spermatocyte secondary spermatocyte divides by
meiosis – II & forms haploid Spermatids.
II. FORMATION OF SPERMS :- The tramsformation or differentiation of spermatids into
spermatozoa or sperm is called spermiogenesis & occurs under the influence of 
FSH  
Ans8. i) Spermatogenesis is initiated due to an increase in the secretion of 
Gonadotropin releasing hormone from hypothalamus at the age of puberty. 
ii) The increased levels of GnRH act on anterior pituitary& stimulate the
secretion of two gonadotropins i-e. leuteinizing hormone (LH) & follicle
stimulating hormone (FSH)
iii) LH acts on leydig cells & stimulate them to secrete testosterone
Page 3


CBSE TEST PAPER-09 
CLASS - XII BIOLOGY (Human Reproduction) 
[ANSWERS] 
Ans1. Ampulla (fallopian tube). 
Ans2. Acrosome contains enzymes e.g. hyaluronidase that helps in dissolving membrane of 
ovum.  
Ans3. Trophoblast. 
Ans4. After ovulation, the graffian follicle ruptures & forms corpus luteum. Corpus luteum 
functions as endocrine glands as they secrete progesterone & estrogen in large 
quantities.  
Ans5. Leydig cells or interstitial cells are located in between the sominiferous tubules. 
Leydig cells secrete male sex hormone TESTOSTERONE which promotes 
development of accessory glands & control male secondary sexual characters.  
Ans6. 
Ans7. Spermatogenesis consists of two phases:- 
I. FORMATIDN OF SPERMATIDS :- It further consist of 3 phases 
i) Multiplication phase :- undifferentiated germ cells undergo repeated division
to produce sperm mother cell or spermatogonia.
ii) Growth phase :- Spermatogonia increase in volume &  is now called PRIMARY
SPERMATOCYTES.
iii) Maturation phase: - primary spermatocyte undergoes meiosis I to produce
small size haploid secondary spermatocyte secondary spermatocyte divides by
meiosis – II & forms haploid Spermatids.
II. FORMATION OF SPERMS :- The tramsformation or differentiation of spermatids into
spermatozoa or sperm is called spermiogenesis & occurs under the influence of 
FSH  
Ans8. i) Spermatogenesis is initiated due to an increase in the secretion of 
Gonadotropin releasing hormone from hypothalamus at the age of puberty. 
ii) The increased levels of GnRH act on anterior pituitary& stimulate the
secretion of two gonadotropins i-e. leuteinizing hormone (LH) & follicle
stimulating hormone (FSH)
iii) LH acts on leydig cells & stimulate them to secrete testosterone
iv) FSH acts on sertoli cells & stimulate secretion of some factors help in
spermiogenesis
Ans9.     During menstrual phase of menstrual cycle which starts on 28
th
 day the endometrial 
lining of female genital tract break down due to lack of progesterone As a result 
bleeding occurs. This monthly flow of blood is caller menstruation.  
During menstrual cycles, the various changes occurs in the ovary under the 
influence of various hormones :-  
i) Menstrual phase :- The levels of hormones LH ,FDH estrogen & progesterone
is very less which results in breakdown of endometrial lining of uterus.
ii) Follicular phase :- In this phase , the levels of pituitary hormones FSH & LH
increases which causes ovarian hormone estrogen to release,. FSH controls
the follicular phase , it stimulates the growth of follicles. Both FSH & LH reach
their peak level in middle of cycle (14
th
 day)
iii) OVULATORY PHASE :-  The level of LH hormones reaches its peak (called LH
swing) induces the ruptures of mature Graffian follicle & there by release of
ovum
Page 4


CBSE TEST PAPER-09 
CLASS - XII BIOLOGY (Human Reproduction) 
[ANSWERS] 
Ans1. Ampulla (fallopian tube). 
Ans2. Acrosome contains enzymes e.g. hyaluronidase that helps in dissolving membrane of 
ovum.  
Ans3. Trophoblast. 
Ans4. After ovulation, the graffian follicle ruptures & forms corpus luteum. Corpus luteum 
functions as endocrine glands as they secrete progesterone & estrogen in large 
quantities.  
Ans5. Leydig cells or interstitial cells are located in between the sominiferous tubules. 
Leydig cells secrete male sex hormone TESTOSTERONE which promotes 
development of accessory glands & control male secondary sexual characters.  
Ans6. 
Ans7. Spermatogenesis consists of two phases:- 
I. FORMATIDN OF SPERMATIDS :- It further consist of 3 phases 
i) Multiplication phase :- undifferentiated germ cells undergo repeated division
to produce sperm mother cell or spermatogonia.
ii) Growth phase :- Spermatogonia increase in volume &  is now called PRIMARY
SPERMATOCYTES.
iii) Maturation phase: - primary spermatocyte undergoes meiosis I to produce
small size haploid secondary spermatocyte secondary spermatocyte divides by
meiosis – II & forms haploid Spermatids.
II. FORMATION OF SPERMS :- The tramsformation or differentiation of spermatids into
spermatozoa or sperm is called spermiogenesis & occurs under the influence of 
FSH  
Ans8. i) Spermatogenesis is initiated due to an increase in the secretion of 
Gonadotropin releasing hormone from hypothalamus at the age of puberty. 
ii) The increased levels of GnRH act on anterior pituitary& stimulate the
secretion of two gonadotropins i-e. leuteinizing hormone (LH) & follicle
stimulating hormone (FSH)
iii) LH acts on leydig cells & stimulate them to secrete testosterone
iv) FSH acts on sertoli cells & stimulate secretion of some factors help in
spermiogenesis
Ans9.     During menstrual phase of menstrual cycle which starts on 28
th
 day the endometrial 
lining of female genital tract break down due to lack of progesterone As a result 
bleeding occurs. This monthly flow of blood is caller menstruation.  
During menstrual cycles, the various changes occurs in the ovary under the 
influence of various hormones :-  
i) Menstrual phase :- The levels of hormones LH ,FDH estrogen & progesterone
is very less which results in breakdown of endometrial lining of uterus.
ii) Follicular phase :- In this phase , the levels of pituitary hormones FSH & LH
increases which causes ovarian hormone estrogen to release,. FSH controls
the follicular phase , it stimulates the growth of follicles. Both FSH & LH reach
their peak level in middle of cycle (14
th
 day)
iii) OVULATORY PHASE :-  The level of LH hormones reaches its peak (called LH
swing) induces the ruptures of mature Graffian follicle & there by release of
ovum
iv) Luteal phase :- The LH & FSH hormones begins to decline. After ovulation, the
follicle becomes to ruptures & is transformed into corpus Luteum which
secretes large quantities of progesterone
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