Solution- Human Reproduction Test-1 Class 12 Notes | EduRev

Class 12 : Solution- Human Reproduction Test-1 Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-04 
CLASS - XII BIOLOGY (Human Reproduction) 
 (Answer Key) 
1. The male testes are located in the scrotum outside the abdominal cavity as the scrotum
provides low temperature than the normal body temperature required for
spermatogenesis.
2. The leydig cells synthesise and secrete testicular hormones called androgens.
3. Fimbriae are finger like projections found in the edges of the infundibulum.
4. The seminal plasma along with the sperms constitutes semen.
5. The vigorous contraction of the uterus that results into the delivery of the child at the end
of pregnancy is called parturition.
6. The human sperm is a microscopic structure with a head, middle piece and a tail. The
head has the haploid nucleus and an anterior acrosome that contains the enzymes
required for the fertilization of the egg. The middle piece has numerous mitochondria to
produce the energy for the mobility of the tail of the sperm.
Page 2


CBSE TEST PAPER-04 
CLASS - XII BIOLOGY (Human Reproduction) 
 (Answer Key) 
1. The male testes are located in the scrotum outside the abdominal cavity as the scrotum
provides low temperature than the normal body temperature required for
spermatogenesis.
2. The leydig cells synthesise and secrete testicular hormones called androgens.
3. Fimbriae are finger like projections found in the edges of the infundibulum.
4. The seminal plasma along with the sperms constitutes semen.
5. The vigorous contraction of the uterus that results into the delivery of the child at the end
of pregnancy is called parturition.
6. The human sperm is a microscopic structure with a head, middle piece and a tail. The
head has the haploid nucleus and an anterior acrosome that contains the enzymes
required for the fertilization of the egg. The middle piece has numerous mitochondria to
produce the energy for the mobility of the tail of the sperm.
7. The structural and the functional unit between the developing embryo and the mother
called placenta
- facilitates the supply of nutrients, oxygen to the embryo and also the removal of carbon
dioxide and other excretory products produced by the embryo.
- it also acts as endocrine tissue and produces several hormones.
8. The number of chromosome in the cells is  as follows:
Primary oocyte: 23 pairs. Secondary oocyte: 23. Ootid: 23. Follicle: 23 pairs.
9. The male accessory glands include paired seminal vesicles, a prostrate gland and paired
bulbourethral glands.
These glands secrete seminal plasma rich in fructose, calcium and certain enzymes.
Secretions of bulbourethral glands help in lubrication of the penis.
10. Menstrual cycle has three phases: menstrual, proliferative and secretory.
a) Menstrual Phase: The phase lasts for 3-5 days in human females and during this period
the endometrial lining of the uterus is cast off and is slowly passed out from vagina as a 
mixture of blood. 
b) Proliferative or Follicular Phase: It lasts for 11 days between 6
th
 to 16
th
 day of the
cycle. During this phase one ovarian follicle is changed into Graafian follicle and the 
endometrial layer is rebuilt along with repair of the ruptured blood vessels. Estrogen 
increases. It ends with ovulation. 
c) Secretory Phase: It lasts for 12 days between 17-28 days. The Graafian follicle is
converted to Corpus Luteum. The endometrium grows and thickens further. 
Progesterone increases. It end with the conversion of corpus luteum to corpus albicans. 
Page 3


CBSE TEST PAPER-04 
CLASS - XII BIOLOGY (Human Reproduction) 
 (Answer Key) 
1. The male testes are located in the scrotum outside the abdominal cavity as the scrotum
provides low temperature than the normal body temperature required for
spermatogenesis.
2. The leydig cells synthesise and secrete testicular hormones called androgens.
3. Fimbriae are finger like projections found in the edges of the infundibulum.
4. The seminal plasma along with the sperms constitutes semen.
5. The vigorous contraction of the uterus that results into the delivery of the child at the end
of pregnancy is called parturition.
6. The human sperm is a microscopic structure with a head, middle piece and a tail. The
head has the haploid nucleus and an anterior acrosome that contains the enzymes
required for the fertilization of the egg. The middle piece has numerous mitochondria to
produce the energy for the mobility of the tail of the sperm.
7. The structural and the functional unit between the developing embryo and the mother
called placenta
- facilitates the supply of nutrients, oxygen to the embryo and also the removal of carbon
dioxide and other excretory products produced by the embryo.
- it also acts as endocrine tissue and produces several hormones.
8. The number of chromosome in the cells is  as follows:
Primary oocyte: 23 pairs. Secondary oocyte: 23. Ootid: 23. Follicle: 23 pairs.
9. The male accessory glands include paired seminal vesicles, a prostrate gland and paired
bulbourethral glands.
These glands secrete seminal plasma rich in fructose, calcium and certain enzymes.
Secretions of bulbourethral glands help in lubrication of the penis.
10. Menstrual cycle has three phases: menstrual, proliferative and secretory.
a) Menstrual Phase: The phase lasts for 3-5 days in human females and during this period
the endometrial lining of the uterus is cast off and is slowly passed out from vagina as a 
mixture of blood. 
b) Proliferative or Follicular Phase: It lasts for 11 days between 6
th
 to 16
th
 day of the
cycle. During this phase one ovarian follicle is changed into Graafian follicle and the 
endometrial layer is rebuilt along with repair of the ruptured blood vessels. Estrogen 
increases. It ends with ovulation. 
c) Secretory Phase: It lasts for 12 days between 17-28 days. The Graafian follicle is
converted to Corpus Luteum. The endometrium grows and thickens further. 
Progesterone increases. It end with the conversion of corpus luteum to corpus albicans. 
11. 
 Spermatogenesis  Oogenesis 
1. It occurs inside the testes. 1. It occurs inside the ovary.
2. All the stages are completed inside the
testes. 
2. Majority occurs inside the ovary but last
stages occur in the oviduct. 
3. Spermatogonia develop from the
germinal epithelium lining in the 
seminiferous tubules. 
3. Oogonia develop from the germinal
epithelium overlying the ovary. 
4. All spermatogonia give rise to
spermatocytes. 
4. Only few oogonia give rise to oocytes.
5. Primary spermatocytes divide by
meiosis I to give rise to two secondary 
spematocytes 
5. Primary oocyte undergoes meiosis I to
give rise to one secondary oocyte and a 
polar body. 
6. Secondary spermatocyte divides by
meiosisII to give rise to two spermatids. 
6. Secondary oocyte divides by meiosisII
to form the ovum and the second polar 
body. 
7. Each spermatid differentiates into
spermatozoan or sperm. 
7. No differentiation is required after
meiosisII. 
8. The sperms formed are motile. 8. The ovum or egg is non- motile.
Page 4


CBSE TEST PAPER-04 
CLASS - XII BIOLOGY (Human Reproduction) 
 (Answer Key) 
1. The male testes are located in the scrotum outside the abdominal cavity as the scrotum
provides low temperature than the normal body temperature required for
spermatogenesis.
2. The leydig cells synthesise and secrete testicular hormones called androgens.
3. Fimbriae are finger like projections found in the edges of the infundibulum.
4. The seminal plasma along with the sperms constitutes semen.
5. The vigorous contraction of the uterus that results into the delivery of the child at the end
of pregnancy is called parturition.
6. The human sperm is a microscopic structure with a head, middle piece and a tail. The
head has the haploid nucleus and an anterior acrosome that contains the enzymes
required for the fertilization of the egg. The middle piece has numerous mitochondria to
produce the energy for the mobility of the tail of the sperm.
7. The structural and the functional unit between the developing embryo and the mother
called placenta
- facilitates the supply of nutrients, oxygen to the embryo and also the removal of carbon
dioxide and other excretory products produced by the embryo.
- it also acts as endocrine tissue and produces several hormones.
8. The number of chromosome in the cells is  as follows:
Primary oocyte: 23 pairs. Secondary oocyte: 23. Ootid: 23. Follicle: 23 pairs.
9. The male accessory glands include paired seminal vesicles, a prostrate gland and paired
bulbourethral glands.
These glands secrete seminal plasma rich in fructose, calcium and certain enzymes.
Secretions of bulbourethral glands help in lubrication of the penis.
10. Menstrual cycle has three phases: menstrual, proliferative and secretory.
a) Menstrual Phase: The phase lasts for 3-5 days in human females and during this period
the endometrial lining of the uterus is cast off and is slowly passed out from vagina as a 
mixture of blood. 
b) Proliferative or Follicular Phase: It lasts for 11 days between 6
th
 to 16
th
 day of the
cycle. During this phase one ovarian follicle is changed into Graafian follicle and the 
endometrial layer is rebuilt along with repair of the ruptured blood vessels. Estrogen 
increases. It ends with ovulation. 
c) Secretory Phase: It lasts for 12 days between 17-28 days. The Graafian follicle is
converted to Corpus Luteum. The endometrium grows and thickens further. 
Progesterone increases. It end with the conversion of corpus luteum to corpus albicans. 
11. 
 Spermatogenesis  Oogenesis 
1. It occurs inside the testes. 1. It occurs inside the ovary.
2. All the stages are completed inside the
testes. 
2. Majority occurs inside the ovary but last
stages occur in the oviduct. 
3. Spermatogonia develop from the
germinal epithelium lining in the 
seminiferous tubules. 
3. Oogonia develop from the germinal
epithelium overlying the ovary. 
4. All spermatogonia give rise to
spermatocytes. 
4. Only few oogonia give rise to oocytes.
5. Primary spermatocytes divide by
meiosis I to give rise to two secondary 
spematocytes 
5. Primary oocyte undergoes meiosis I to
give rise to one secondary oocyte and a 
polar body. 
6. Secondary spermatocyte divides by
meiosisII to give rise to two spermatids. 
6. Secondary oocyte divides by meiosisII
to form the ovum and the second polar 
body. 
7. Each spermatid differentiates into
spermatozoan or sperm. 
7. No differentiation is required after
meiosisII. 
8. The sperms formed are motile. 8. The ovum or egg is non- motile.
12. The sperm carries the genetic information from the father in form of 23 chromosomes
(including the male sex chromosome X or Y) while the egg bears the genetic information
from the mother (including the female sex chromosome X). Thus during fertilization the
fusion of the male and the female gametes produce new genetic combination which
introduces variation in the progeny. The zygote or the fertilized egg contain the genetic
information which accordingly controls the development of the embryo.
13. The Fusion of the sperm and the egg in humans result into formation of the diploid
structure called zygote.
The zygote starts dividing mitotically as it moves through the oviduct into the uterus to 
form 2,4,8,16 daughter cells called blastomeres. The stage is called morula. 
The Morula divides further and differentiates into blastocysts. 
The outer layer of blastomeres called trophoblast gets attached to the endometrial layer 
of the uterus. 
The uterine wall divides and encloses the blastocysts and this is referred to as 
implantation.  
The inner layer of blastomeres in the blastocysts gives rise to the embryo. 
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