12th Grade > Biology
HUMAN REPRODUCTION MCQs
Total Questions : 57
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Answer: Option C. -> Malignant cells spread
:
C
Metastasisis the spread of cancer cells to new areas of the body (often by way of the lymphatic system or bloodstream).Inmetastasis, cancer cells break away from where they first formed (primary cancer), travel through the blood or lymph, and form new tumors (metastatictumors) in other parts of the body.
:
C
Metastasisis the spread of cancer cells to new areas of the body (often by way of the lymphatic system or bloodstream).Inmetastasis, cancer cells break away from where they first formed (primary cancer), travel through the blood or lymph, and form new tumors (metastatictumors) in other parts of the body.
Answer: Option D. -> All animals have fixed sexes.
:
D
Fusion of male and female gametes during sexual reproduction forms a zygote which undergoes various stages of development to form a new individual. Therefore, it takes a long time for completion as compared to asexual methods of reproduction like binary fission, budding, fragmentation, etc. The offspring born through sexual reproduction are not identical to their parents but resemble them. This is because of the variation induced in the zygote due to exchange of genetic material. In lower organisms, the sexes are not fixed. For example in clown fish, sex literally depends on how big they are. The largest fish among the lot is designated as the breeding female while the second largest fish is always the breeding male. Upon death of the breeding female, the breeding male simply turns into the breeding female and replaces her. Sexual reproduction leads to genetic recombination. Sexual reproduction produces new and unique combinations of maternal and paternal alleles in each offspring. That leads to a great diversity of individuals in the population. Natural selection can then act on the population to give some individuals greater fitness than others, leading to changes in the population over time.
:
D
Fusion of male and female gametes during sexual reproduction forms a zygote which undergoes various stages of development to form a new individual. Therefore, it takes a long time for completion as compared to asexual methods of reproduction like binary fission, budding, fragmentation, etc. The offspring born through sexual reproduction are not identical to their parents but resemble them. This is because of the variation induced in the zygote due to exchange of genetic material. In lower organisms, the sexes are not fixed. For example in clown fish, sex literally depends on how big they are. The largest fish among the lot is designated as the breeding female while the second largest fish is always the breeding male. Upon death of the breeding female, the breeding male simply turns into the breeding female and replaces her. Sexual reproduction leads to genetic recombination. Sexual reproduction produces new and unique combinations of maternal and paternal alleles in each offspring. That leads to a great diversity of individuals in the population. Natural selection can then act on the population to give some individuals greater fitness than others, leading to changes in the population over time.
Answer: Option B. -> 16
:
B
The spermatogonia divide mitotically, and some of them undergo two rounds of mitosis, each forming 4 primary spermatocytes, each of whichundergoes meiosis to produce 2 haploid secondary spermatocytes. Each secondary spermatocyte then undergoes mitosis to produce 2 spermatids, which eventually become 2 sperms. Each primary spermatocyte thus, produces 4 sperms. Hence 4 primary spermatocytes would produce 16 sperms.
:
B
The spermatogonia divide mitotically, and some of them undergo two rounds of mitosis, each forming 4 primary spermatocytes, each of whichundergoes meiosis to produce 2 haploid secondary spermatocytes. Each secondary spermatocyte then undergoes mitosis to produce 2 spermatids, which eventually become 2 sperms. Each primary spermatocyte thus, produces 4 sperms. Hence 4 primary spermatocytes would produce 16 sperms.
Answer: Option C. -> Menopause
:
C
The reproductive cycle in the female primates (e.g., monkeys, apes and human beings) is called menstrual cycle. The first menstruation begins at puberty and is called menarche. In human beings, menstrual cycle ceases around 50 years of age; this is termed as menopause. Cyclic menstruation is an indicator of normal reproductive phase and extends between menarche and menopause.
:
C
The reproductive cycle in the female primates (e.g., monkeys, apes and human beings) is called menstrual cycle. The first menstruation begins at puberty and is called menarche. In human beings, menstrual cycle ceases around 50 years of age; this is termed as menopause. Cyclic menstruation is an indicator of normal reproductive phase and extends between menarche and menopause.
Answer: Option D. -> 1
:
D
The process of formation of a mature female gamete is called oogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each foetal ovary; no more oogonia are formed and added after birth. These oogonia undergo mitotic divisions to form primary oocytes, which then begin to undergo meiosis I. They however, get arrested at prophase I. After the onset of puberty, every month, one or more of these primary oocytes continue their meiotic division, and a single ovum is released from one ovary.
:
D
The process of formation of a mature female gamete is called oogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each foetal ovary; no more oogonia are formed and added after birth. These oogonia undergo mitotic divisions to form primary oocytes, which then begin to undergo meiosis I. They however, get arrested at prophase I. After the onset of puberty, every month, one or more of these primary oocytes continue their meiotic division, and a single ovum is released from one ovary.
Answer: Option D. -> Prolactin
:
D
Prolactin, also calledluteotropic hormone(LTH) or luteotropin, a proteinhormone produced by the pituitary gland of mammals that acts with otherhormonesto initiate secretion of milk by the mammary glands.
:
D
Prolactin, also calledluteotropic hormone(LTH) or luteotropin, a proteinhormone produced by the pituitary gland of mammals that acts with otherhormonesto initiate secretion of milk by the mammary glands.
Answer: Option D. -> Catabolic effect on protein and carbohydrate metabolism
:
D
Androgens are male hormones which bring about secondary sexual characters in males. They are anabolic hormones, i.e., they help in “building up” processes such as glycogen formation. Catabolic effect includes breakdown oflarger substances to simpler substances to release energy.
:
D
Androgens are male hormones which bring about secondary sexual characters in males. They are anabolic hormones, i.e., they help in “building up” processes such as glycogen formation. Catabolic effect includes breakdown oflarger substances to simpler substances to release energy.
Answer: Option A. -> Epididymis
:
A
The testes produces around 120 million sperms per day. After maturation and acquiring motility in the epididymis , a lot of the sperms move to thevas deferens where they are stored until ejaculation.
:
A
The testes produces around 120 million sperms per day. After maturation and acquiring motility in the epididymis , a lot of the sperms move to thevas deferens where they are stored until ejaculation.
Answer: Option A. -> It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
:
A
A morula is an embryo at an early stage of embryonic development, consisting of cells (called blastomeres) in a solid ball contained within the zona pellucida. The morula is produced by embryonic cleavage, the rapid division of the zygote. The increase in the number of cells doesn't change the size of the original mass. The divisions are rapid because there is no net growth of the embryo. In the absence of growth, the cell number in the embryo increases while the cell size decreases. Thus, it has an almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.
:
A
A morula is an embryo at an early stage of embryonic development, consisting of cells (called blastomeres) in a solid ball contained within the zona pellucida. The morula is produced by embryonic cleavage, the rapid division of the zygote. The increase in the number of cells doesn't change the size of the original mass. The divisions are rapid because there is no net growth of the embryo. In the absence of growth, the cell number in the embryo increases while the cell size decreases. Thus, it has an almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.
Answer: Option A. -> Epididymis
:
A
The spermatozoa are released into the epididymis in a process called spermiation where they continue to mature. Despite having all the required structural components, the spermatozoa in the seminiferous tubules and the early epididymis are notmotile.However,after around 18 to 24 hours of sitting around in the epididymis, these spermatozoa develop the property of motility.
:
A
The spermatozoa are released into the epididymis in a process called spermiation where they continue to mature. Despite having all the required structural components, the spermatozoa in the seminiferous tubules and the early epididymis are notmotile.However,after around 18 to 24 hours of sitting around in the epididymis, these spermatozoa develop the property of motility.
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