12th Grade > Biology
HUMAN REPRODUCTION MCQs
Total Questions : 57
| Page 4 of 6 pages
Answer: Option A. -> True
:
A
Malecircumcisionis the removal of the foreskin from the human penis.The presence of foreskin has been proven to increase chances of cancer of the penis, and hence, in many western countries, circumcision, or removal of the foreskin covering the glans, is done at birth as a routine practice.
:
A
Malecircumcisionis the removal of the foreskin from the human penis.The presence of foreskin has been proven to increase chances of cancer of the penis, and hence, in many western countries, circumcision, or removal of the foreskin covering the glans, is done at birth as a routine practice.
Answer: Option B. -> (i) b, (ii) a, (iii) d, (iv) c
:
B
There are many modes of asexual reproduction such as binary fission, budding, fragmentation, etc. In binary fission, first the genetic material is replicated and then the cells divide into nearly two equal daughter cells. Budding on the other hand follows a similar pattern as binary fission; the differing character is that of the daughter cell being smaller than the parent cell. In the process of fragmentation, a split fragment or part of an organism develops into a fully mature individual. Reproduction by fragmentation is seen in starfish, plants like liverworts, etc.
On the other hand, sexual reproduction involves the fusion of male and female gametes produced by two different individuals or parents. The fusion of gametes results in a zygote which develops into a new individual.
:
B
There are many modes of asexual reproduction such as binary fission, budding, fragmentation, etc. In binary fission, first the genetic material is replicated and then the cells divide into nearly two equal daughter cells. Budding on the other hand follows a similar pattern as binary fission; the differing character is that of the daughter cell being smaller than the parent cell. In the process of fragmentation, a split fragment or part of an organism develops into a fully mature individual. Reproduction by fragmentation is seen in starfish, plants like liverworts, etc.
On the other hand, sexual reproduction involves the fusion of male and female gametes produced by two different individuals or parents. The fusion of gametes results in a zygote which develops into a new individual.
Answer: Option A. -> Spermatids are transformed into sperms in this process
:
A
In testis, the immature male germ cells (spermatogonia) produce sperms by spermatogenesis that begins at puberty. The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.
:
A
In testis, the immature male germ cells (spermatogonia) produce sperms by spermatogenesis that begins at puberty. The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.
Answer: Option A. -> True
:
A
Prostatitis involves inflammation of the prostate gland. It becomes enlarged and painful, often leading to discomfort specifically in the region between the anus and the scrotum.
:
A
Prostatitis involves inflammation of the prostate gland. It becomes enlarged and painful, often leading to discomfort specifically in the region between the anus and the scrotum.
Answer: Option B. -> Both statements are correct
:
B
Fallopian tube extends from the left and right superior corners of the uterus to the edges of the ovaries. It ends in a funnel shaped structure called infundibulum which has finger like projections called fimbriae.
:
B
Fallopian tube extends from the left and right superior corners of the uterus to the edges of the ovaries. It ends in a funnel shaped structure called infundibulum which has finger like projections called fimbriae.
Answer: Option C. -> LH
:
C
Changes in the ovary and the uterus during the menstrual cycle are induced by changes in the levels of pituitary and ovarian hormones. The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase, and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of the cycle (about the 14th day). Rapid secretion of Luteinising Hormone (LH) leading to its maximum level during mid-cycle called LH surge induces rupture of Graafian follicle and thereby, the release of ovum (ovulation).
:
C
Changes in the ovary and the uterus during the menstrual cycle are induced by changes in the levels of pituitary and ovarian hormones. The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase, and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of the cycle (about the 14th day). Rapid secretion of Luteinising Hormone (LH) leading to its maximum level during mid-cycle called LH surge induces rupture of Graafian follicle and thereby, the release of ovum (ovulation).
Answer: Option A. -> Absence of cavity
:
A
The single-celled zygote divides by mitosis, and this division has a special name - it is called cleavage, forming 2 cells. The first division occurs about a day after fertilization, and subsequent divisions occur every 12 to 24 hours after that. From here on, the collection of cells wouldbe broadly called an embryo until the 8th week of gestation. During this period, the embryo further divides to form 4 cells,which divide to form 8 and then 16 cells, and so on. These daughter cells that are formed are known as blastomeres. Once the embryo has reached 8 to 16 blastomeres, it is known as a morula.Soon after the number of cells of the morula increases and they start to “differentiate”, the trophoblast cells secrete fluid into the center of the morula to create a fluid-filled space inside, called the blastocoel. Now that the embryo has taken the form of a hollow ball of cells, it is called a blastula.
:
A
The single-celled zygote divides by mitosis, and this division has a special name - it is called cleavage, forming 2 cells. The first division occurs about a day after fertilization, and subsequent divisions occur every 12 to 24 hours after that. From here on, the collection of cells wouldbe broadly called an embryo until the 8th week of gestation. During this period, the embryo further divides to form 4 cells,which divide to form 8 and then 16 cells, and so on. These daughter cells that are formed are known as blastomeres. Once the embryo has reached 8 to 16 blastomeres, it is known as a morula.Soon after the number of cells of the morula increases and they start to “differentiate”, the trophoblast cells secrete fluid into the center of the morula to create a fluid-filled space inside, called the blastocoel. Now that the embryo has taken the form of a hollow ball of cells, it is called a blastula.
Answer: Option D. -> Both [A] and [R] are true but [R] is not a correct explanation to [A]
:
D
Breast cancer is the second leading cause of death by cancer in women. BRCA1 and BRCA2 are tumour suppressor genes, and mutation of these genes leads to breast cancer and additional risk of various types of cancers. But these gene mutations do not have a link to cervical cancer.Cervical canceris a cancer of the entrance to the uterus.Most cases of cervical cancer are caused by a virus calledhuman papillomavirusorHPV.
:
D
Breast cancer is the second leading cause of death by cancer in women. BRCA1 and BRCA2 are tumour suppressor genes, and mutation of these genes leads to breast cancer and additional risk of various types of cancers. But these gene mutations do not have a link to cervical cancer.Cervical canceris a cancer of the entrance to the uterus.Most cases of cervical cancer are caused by a virus calledhuman papillomavirusorHPV.
Answer: Option B. -> Endometrium
:
B
The menstrual cycle begins on day 1 with the onset of bleeding, known as menstrual phase or menstruation. It is the shedding of the endometrial lining of the uterus. Every month, in response to the increased FSH, LH, and estrogen during follicular growth and ovulation, the endometrium or lining of the uterus undergoes changes. When fertilization doesn’t take place, the corpus luteum degenerates. This degeneration of the corpus luteum leads to a drop in estrogen and progesterone. When this happens the endometrial lining, which is rich in vasculature and very thick, begins to shed.
:
B
The menstrual cycle begins on day 1 with the onset of bleeding, known as menstrual phase or menstruation. It is the shedding of the endometrial lining of the uterus. Every month, in response to the increased FSH, LH, and estrogen during follicular growth and ovulation, the endometrium or lining of the uterus undergoes changes. When fertilization doesn’t take place, the corpus luteum degenerates. This degeneration of the corpus luteum leads to a drop in estrogen and progesterone. When this happens the endometrial lining, which is rich in vasculature and very thick, begins to shed.
Answer: Option D. -> Blastocyst
:
D
The term "implantation" is used to describe process of attachment and invasion of the uterine endometrium by theblastocyst.
:
D
The term "implantation" is used to describe process of attachment and invasion of the uterine endometrium by theblastocyst.
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