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Human Reproduction Mcq
Quiz 5
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Q.1
Proximal centriole of sperm is found in ... ... [ MHTCET 2008]
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a) Head
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b) Neck
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c) Middle piece
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d) Tail
Explanation
The human sperm neck contains two centrioles as well as a specialized PCM. The proximal centriole (PC) is found just near the head base, and the distal centriole (DC) is located further from the head, attached to the base of the axoneme Answer : (b)
Q.2
Stage of sperm before entry into ovum/a prefertilisation process is .... [ JIPMER 2004 ]
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a) Maturation
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b) Insemination
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c) Capacitation
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d) Fertilization
Explanation
Capacitation is a process whereby the glycoprotein coat is modified and seminal proteins are removed from the surface of the sperm. Answer : (c)
Q.3
Chemical substance present on the surface of sperm is ... ... [ MPPMT 1994 ]
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a) Hyaluronidase
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b) Antifertilizin
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c) Agglutinin
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d) Fertilizin
Explanation
Antifertilizin: A protein that reacts with fertilizin, causing sperm to adhere to the egg. Answer : (b)
Q.4
Secretions from which one of the following is rich in fructose, calcium and some enzymes ... ... [ CBSE 2010 ]
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a) Male accessory glands
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b) Pancreas
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c) Liver
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d) Salivary glands
Explanation
Male accessory gland, prostate gland, produces a milky slightly alkaline secretion which forms 25% of the volume of semen. It possesses calcium, phosphate, bicarbonates, enzymes, clotting enzymes, prefibrolysin and prostaglandins. Secretion of the prostate gland nourish and activates the spermatozoa to swim. Prostaglandins helps in liquefying cervical mucus and helps in liquefying cervical mucus and stimulating movement in the female tract. Answer : (a)
Q.5
Fusion of sperm and ovum is ... ... [ RPMT 2006 ]
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a) Amphimixis
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b) Regeneration
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c) Fertilization
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d) None of the above
Explanation
The action or process of fertilizing an egg or a female animal or plant, involving the fusion of male and female gametes to form a zygote. Answer : (c)
Q.6
The process of formation of ova is called ... ... [ MPPMT 1999 ]
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a) Ovulation
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b) Oogenesis
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c) Oviparity
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d) Oviposition
Explanation
Oogenesis the production or development of an ovum. Answer : (b)
Q.7
Capacitation of sperm occurs in ... ... [ DPMT 2007 ]
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a) Female genital tract
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b) Vagina
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c) Vas efferens
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d) Vas deferens
Explanation
Capacitation occurs while sperm reside in the female reproductive tract for a period of time, as they normally do during gamete transport. The length of time required varies with species, but usually requires several hours. Answer : (a)
Q.8
Germinal epithelium of ovary has .... .... [AFMC 1996]
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a) Cuboidal cells
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b) Columnar cells
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c) Squamous cells
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d) Stratified cells
Explanation
The ovarian surface epithelium, also called the germinal epithelium of Waldeyer, is a layer of simple squamous-to-cuboidal epithelial cells covering the ovary. Answer : (a)
Q.9
If mammalian ovum fails to get fertilized which of the following is unlikely ... ... [ CBSE 2005 ]
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a) Corpus luteum will disintegrate
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b) Primary follicle starts developing
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c) Progesterone secretion rapidly declines
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d) Estrogen secretion further decreases
Explanation
Answer : (b)
Q.10
Connective tissue around seminiferous tubules possess endocrine cells called ... ... [ MHT CET 2003 ]
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a) Leydig cells
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b) Sertoli cells
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c) Primary germ cells
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d) Both A and B
Explanation
The connective tissue lying in between seminiferous tubules are called Leydig’s cell and it contain yellow pigment granules. Leydig cells are large polyhedral cells which have eccentric nucleus and small lipid containg vacuoles. They secrete testosterone and other androgens. Answer : (a)
Q.11
Ovulation occurs in and on ... ... [ Har PMT 2005 ]
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a) Ovary
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b) About 14th day
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c) Both A and B
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d) None of these
Explanation
Ovulation typically happens around day 14 of a 28-day menstrual cycle in ovary Answer : (c)
Q.12
Gametes are formed in animals from .... ... [ kerala 2004 ]
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a) Muscular tissue
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b) Nervous tissue
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c) Connective tissue
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d) Epithelial tissue
Explanation
The germinal epithelium is the epithelial layer of the seminiferous tubules of the testicles. It is also known as the wall of the seminiferous tubules Answer : (d)
Q.13
For ovulation in reflex ovulators ... ... [ MPPMT 1995 ]
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a) Coitus is necessary
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b) Coitus is not necessary
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c) Plenty of food is not necessary
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d) Plenty of food is necessary
Explanation
Ovulation is the release of the female germ cell, oocyte from ovarian follicle at the ovary surface. The mechanism of ovulation varies between species. It is either cyclical and spontaneous or noncyclical and reflex or induced. Spontaneous ovulation is the ovulatory process in which the maturing ovarian follicles secrete ovarian steroids to generate pulsatilla GnRH (neuropeptide controlling reproduction in vertebrates ) release into the median eminence ( the area which connects hypothalamus to anterior pituitary gland) to cause per- ovulatory LH ( luteinizing hormone) surge. Spontaneously ovulating species go through menstrual cycles and are fertile at the certain period of cycle e.g., ratchet, mice, sheep, humans. Induced or reflex ovulation is the process by which preovulatory LH surge and therefore the ovulation is induced by some components of coitus or mating or some sort of genital stimulation. In some cases, ovulation is induced by plasma of seminal fluid e.g. cats, rabbits, ferrets etc. Thus, the correct answer is option "a" Answer : (a)
Q.14
Identical twins are also known as ... ... [ Odisha 2010 ]
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a) Monozygotic twins
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b) Dizygotic twins
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c) Fraternal twins
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d) Both B and C
Explanation
Monozygotic twins, also known as identical twins, develop from one egg fertilized by one sperm. Answer : (a)
Q.15
In the diagram of section of Graafian follicle, different parts are indicated by alphabets. Choose the correct combination.
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a) a- membrana granulosa, b- theca interna, c-ovum, d-cumulus oophorus, e-antrum, f-theca externa
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b) a -theca externa , b- theca interna , c- ovum , d -membrana granulosa ,e -antrum , f -cumulus oophorus
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c) a -theca externa , b- theca interna , c- ovum , d -cumulus oophorus ,e - antrum , f -membrana granulosa
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d) a -membrana granulosa , b- theca externa , c- ovum , d -cumulus oophorus ,e -antrum , f -theca interna
Explanation
Answer : (b)
Q.16
Thick yellow, high protein fluid produced by mammary glands of woman during first 2-3 days after child birth is ... .....
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a) Meconium
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b) Hymen
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c) Cumulus oophorus
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d) Colostrum
Explanation
Colostrum is a breast fluid produced by humans, cows, and other mammals before breast milk is released. It’s very nutritious and contains high levels of antibodies, which are proteins that fight infections and bacteria. Answer : (d)
Q.17
What is true of cleavage? ... ... [ MPPMT 1989]
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a) Daughter cells or blastomeres grow in size equal to parent cell
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b) Blastomeres separate
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c) Cytoplasm of blastomeres increases after each division
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d) There is no growth of daughter cells
Explanation
Answer : (d)
Q.18
Epididymis is ... ....
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a) A long coiled tube between vasa efferentia and vas deferens
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b) Network of sinuses between seminiferous tubules and efferentia
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c) Connection between vas deferens and seminal vesicle
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d) Intermediate structure between rete testis and vasa efferentia
Explanation
Answer : (a)
Q.19
Function of Sertoli cells is controlled by ... ... [ AFMC 2008 ]
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a) Estrogen
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b) FSH
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c) Testosterone
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d) ACTH
Explanation
Answer : (b)
Q.20
Acrosome of sperm contains ... ... [ Manipal 2005 ]
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a) Hyaluronidase and acrosin
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b) hyaluronic acid and acrosin
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c) Hippuric acid and uric acid
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d) Creatinine
Explanation
Acrosome contains enzymes hyaluronidase and acrosin. These enzymes break down the outer membrane of the ovum, called the zona pellucida, allowing the haploid nucleus in the sperm cell to join with the haploid nucleus in the ovum. Answer : (a)
Q.21
Low level of progesterone and estrogen stimulates production of ... ... [ AMU 2005 ]
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a) FSH - RH
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b) LH
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c) GH
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d) All the above
Explanation
Low levels of estrogen and progesterone signal the pituitary gland to produce Follicle Stimulating Hormone (FSH) Answer : (a)
Q.22
Spermatozoa are nourished during their development by ... ... [ AFMC 1997 ]
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a) Sertoli cells
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b) Interstitial cells
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c) Connective tissue cells
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d) None of the above
Explanation
A Sertoli cell is a "nurse" cell of the testicles that is part of a seminiferous tubule and helps in the process of spermatogenesis, the production of sperm Answer : (a)
Q.23
The cavity contained in Graafian follicle is ... ... [ MHTCET 2010 ]
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a) Antrum
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b) Centrocoel
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c) Blastocoel
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d) Archenteron
Explanation
Answer : (a)
Q.24
In uterus, endometrium proliferates in response to .... ... [ kerala 2004 ]
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a) Relaxin
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b) Oxytocin
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c) Progesterone
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d) Oestrogen
Explanation
The layer of cells that line the uterus is called the endometrium . It is this layer that proliferates in response to estrogen and later, develops into a secretory lining in response to progesterone. Answer : (d)
Q.25
In human the unpaired male reproductive structure is ... ... [ kerala 2010 ]
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a) testis
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b) seminal vesicle
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c) bulbourethral gland
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d) prostate
Explanation
In human the unpaired male reproductive structure is prostate. The paired bulbourethral (Cowper's) glands are small, about the size of a pea, and located near the base of the penis. The paired seminal vesicles are saccular glands posterior to the urinary bladder. The two testicles are egg-shaped male reproductive glands Answer : (d)
Q.26
Spermiogenesis changes .... ...[ MPPMT 1990 ]
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a) Spermatogonium to primary spermatocyte
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b) Primary spermatocyte to secondary spermatocyte
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c) Secondary spermatocyte to spermatid
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d) Spermatid to sperm
Explanation
The primary spermatocyte divides meiotically (Meiosis I) into two secondary spermatocytes; each secondary spermatocyte divides into two equal haploid spermatids by Meiosis II. The spermatids are transformed into spermatozoa (sperm) by the process of spermiogenesis. Answer : (d)
Q.27
Vas efferentia connect the .... ...
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a) Testis with epididymis
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b) Kidneys with cloaca
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c) Testes with urogenital ducts
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d) None of the above
Explanation
The efferent ducts or efferent ductules or ductuli efferentes or ductus efferentes or vasa efferentia connect the testis with the initial section of the epididymis. Answer : (a)
Q.28
Graafian follicle contains ... ... [ MPPMT 2000 ]
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a) many oocytes
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b) many sperms
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c) single oocyte
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d) site for egg fertilisation
Explanation
Ovarian follicles are the basic units of female reproductive biology. Each of them contains a single oocyte (immature ovum or egg cell). Answer : (c)
Q.29
Sperms move actively in female genital tract by ... ...
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a) Creeping
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b) Gliding
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c) Swimming
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d) Jet propulsion
Explanation
A few thousand sperm swim through the uterotubal junctions to reach the Fallopian tubes (uterine tubes, oviducts) where sperm are stored in a reservoir, or at least maintained in a fertile state, by interacting with endosalpingeal (oviductal) epithelium. Answer : (c)
Q.30
Axial filament of sperm is formed by ... ...
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a) Distal centriole
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b) Proximal centriole
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c) Mitochondrial spiral
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d) DNA
Explanation
The distal centriole gives rise to the axial filament which forms the tail and has a (9+2) arrangement Answer : (a)
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