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Quiz 4
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Q.1
Spermatogenesis occurs in ... ... [ Odisha 2012 ]
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a) Vasa deferentia
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b) Epididymis
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c) Seminiferous tubules
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d) Penis
Explanation
Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis. Answer : (c)
Q.2
Ovulation is caused by ... ... [ Wardha 2005 ]
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a) Oestrogen
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b) Oestrogen and progesterone
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c) FSH and oestrogen
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d) FSH and LH
Explanation
The ovulation process is regulated by fluxing gonadotropic hormone (FSH/LH) levels. FSH stimulates the growth and maturation of immature oocytes into mature (Graafian) follicles before ovulation. Luteinizing Hormone (LH) is a gonadotropin synthesized and secreted by the anterior pituitary gland in response to GnRH Answer : (d)
Q.3
Growth and maturation of Graafian follicle is controlled by .... ... [ MPPMT 1995]
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a) FSH - LH
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b) FSH - LTH
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c) ACTH - LH
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d) GH - ADH
Explanation
FSH stimulates the growth and maturation of immature oocytes into mature (Graafian) follicles before ovulation. Luteinizing Hormone (LH) is a gonadotropin synthesized and secreted by the anterior pituitary gland in response to GnRH Answer : (a)
Q.4
Early embryonic stage that follows blastula is ... ... [ AMU 2000 ]
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a) Morula
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b) Amphiblastula
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c) Radula
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d) Gastrula
Explanation
The Blastula is the early stage of development. When this occurs, the embryo is a ball of hollow cells. The Gastula stage follows Blastula. It includes the three-layer of cells. Answer : (d)
Q.5
In a regularly cycling human female, which can be root cause of menstrual failure?
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a) Fertilisation of ovum
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b) Maintenance of hypertrophical endometrial lining
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c) Maintenance of high titre of sex hormones
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d) Retention of well developed corpus luteum
Explanation
Aerobic exercises which increase your heart rate are the best for relieving period cramps. Cycling falls under that category. exercise bike causes three times as large an increase in the production of the hormone So there is no reason for her menstrual failure But possible if she is pregnant or Fertilisation of ovum Answer : (a)
Q.6
Hormone controlling human menstrual cycle is ... ... [ CBSE 2002 ]
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a) Estrogen
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b) FSH
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c) LH
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d) All the above
Explanation
Answer : (d)
Q.7
Assertion : in a woman after hysterectomy ( removal of uterus), the ovarian cycle is stopped Reason: Stoppage of FSH secretion .... ... [ AIIMS 2000 ]
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a) If both the assertion and reason are true and reason explains the assertion.
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b) If both the assertion and reason are true but reason does not explain the assertion.
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c) If assertion is true but reason is false
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d) If both assertion and reason is false.
Explanation
A hysterectomy is an operation procedure used to remove the uterus (womb). The ovaries produce eggs or ova and production of hormones or chemicals, which regulate menstruation and other aspects of health and well-being, including sexual well-being. The ovaries generally continue to produce hormones and undergo monthly cycle under the influence of pituitary hormones, although in some cases they may have reduced activity. Some hysterectomies also include removal of the ovaries, so the supply of essential female hormones is greatly reduced. This can have various effects. Thus, the correct answer is option d. Answer : (b)
Q.8
During spermatogenesis, the first meiotic division occurs in ... ... [ kerala 2012 ]
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a) Sertoli cells
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b) Spermatids
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c) Secondary spermatocytes
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d) Primary spermatocytes
Explanation
Answer : (d)
Q.9
Sertoli cells are involved in ... .. [ Guj CET 2008]
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a) Excretion
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b) Respiration
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c) Nutrition and morphogenesis of sperms
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d) All the above
Explanation
Answer : (c)
Q.10
In which phase of cell division are oogonia arrested
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a) Anaphase I
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b) Prophase I
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c) Interphase
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d) Both A and B
Explanation
The oogonia form primary oocytes before birth. Primary oocytes begin the first meiotic division before birth but do not complete prophase 1 and stay dormant until puberty. The cell division is oogonia is arrested at the diplotene stage of prophase I. Thus the correct answer is option B. Answer : (b)
Q.11
Lower narrow end of uterus is called ... ...
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a) Urethra
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b) Cervix
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c) Clitoris
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d) Vulva
Explanation
Answer : (b)
Q.12
Abnormal condition when mammae of man become female like ... ... [ Odisha 2005 ]
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a) Feminisation
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b) Gynochorium
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c) Gynoecium
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d) Gynecomastia
Explanation
Gynecomastia : Enlarged breasts in men is an increase in the amount of breast gland tissue in boys or men, caused by an imbalance of the of the hormones estrogen and testosterone. Option 'd' correct Feminization is the shift in gender roles and sex roles in a society, group, or organization towards a focus upon the feminine. Gynoecium is the female part of a flower, consisting of one or more carpels. Answer : (d)
Q.13
Progesterone is ... ... [ RPMT 1995 ]
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a) Carbohydrate
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b) Steroid
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c) Protein
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d) Sterol
Explanation
Progesterone is a female sex hormone. It's produced mainly in the ovaries following ovulation each month. Answer : (b)
Q.14
Immediate membrane covering the mammalian egg is ... ... [ MPPMT 1994 ]
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a) Corona radiata
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b) Zona pellucida
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c) Vitelline membrane
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d) Chorion
Explanation
The corona radiata is an outer layer of follicular (granulosa) cells that form around a developing oocyte in the ovary and remain with it upon ovulation. Immediately after ovulation, the mammalian egg is covered by a membrane known as zona pellucida. It is a glycoprotein layer surrounding the plasma membrane of mammalian oocytes. It is a vital constitutive part of the oocyte. It is secreted by both the oocyte and the follicular cells. Therefore, the correct answer is option b. Answer : (a)
Q.15
In human female, ovulation occurs during menstrual cycle ... ... [ CBSE 2004 ]
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a) At the end of proliferative phase
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b) In the middle of secretory phase
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c) Just before the end of secretory phase
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d) In the beginning of proliferative phase
Explanation
The inner lining of the uterus (the endometrium) goes through three phases during the typically 28 day menstrual cycle: the menstrual phase (days 1-5), The proliferative phase (days 6-14) , The endometrium is thinnest during the period, and thickens throughout this phase until ovulation occurs and The secretory phase (days 15-28). The ovarian cycle, refers to the cycle in which a woman’s ovaries prepare an egg to be released during ovulation Answer : (a)
Q.16
Which group represents external genitalia of human female? .... ... [ Guj CET 2009]
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a) Labium minora, labium majora , vagina
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b)Labium minora, labium majora , oviduct
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c) Labium minora, labium majora , cervix
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d) Labium minora, labium majora , clitoria
Explanation
External genitalia of human female: Mons pubis, Labia majora, Labia minora, Clitoris, Vestibule, Hymen, Vestibular bulb, Vestibular glands Answer : (d)
Q.17
Stage of embryo development at which implantation occurs in human female is ... ... [ Guj CET 2007 ]
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a) Morula
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b) Zygote
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c) Blastocyst
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d) Neurula
Explanation
In humans, implantation is the stage of pregnancy at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocyst. It is by this adhesion that the embryo receives oxygen and nutrients from the mother to be able to grow. Answer : (c)
Q.18
Sperm are produced in ... ... [ Odisha 2008 ]
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a) Epididymis
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b) Interstitial cells
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c) Prostate gland
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d) Seminiferous tubules
Explanation
Seminiferous tubules are located within the testes, and are the specific location of meiosis, and the subsequent creation of male gametes, namely spermatozoa. Answer : (d)
Q.19
Corpus luteum develops from .... ... [ BHU 1996 ]
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a) Oocyte
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b) Nephrostome
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c) Ruptured Graafian follicle
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d) None of the above
Explanation
Corpus luteum is the remains of the ovarian follicle that has released a mature ovum during a previous ovulation. Answer : (c)
Q.20
In corona radiata, the cells are held together by ... ....
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a) Cytoplasmic connections
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b) Cell membrane interdigitation
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c) Thin layer of intercellular cement
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d) Hyaluronic acid
Explanation
Dispersal of cells in the outer egg envelope (corona radiata) is caused by the action of an enzyme (hyaluronidase) that breaks down a substance (hyaluronic acid) binding corona radiata cells together. Answer : (d)
Q.21
Mobility of mature sperm is controlled by mitochondria present in ... ... [ MPPMT 2002 ]
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a) Head
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b) Middle piece
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c) Tail
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d) All the above
Explanation
The mitochondria lies in the middle piece which provides energy to the sperm to swim. The tail helps the sperm to swim across Answer : (b)
Q.22
Sixty percent of semen is produced by ... ... [ MHTCET 2011 ]
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a) Bartholin's glands
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b) Cowper's glands
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c) Seminal vesicles
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d) Prostate gland
Explanation
Fluids contributed by the seminal vesicles are approximately 60 percent of the total semen volume; these fluids contain fructose, amino acids, citric acid, phosphorus, potassium, and hormones known as prostaglandins. Answer : (c)
Q.23
Number of autosomes in human primary spermatocyte is ... ... [ DPMT 2011 ]
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a) 22
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b) 23
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c) 44
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d) 46
Explanation
A primary spermatocyte will have 46 chromosomes or chromatids. Primary spermatocytes are diploid cells. Secondary spermatocytes are haploid cells with only 23 chromosomes. Answer : (c)
Q.24
What is the total number of polar bodies formed during oogenesis in the ovary? [ MPPMT 1991 ]
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a) 4
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b) 2
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c) 3
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d) 6
Explanation
Answer : (b)
Q.25
Temperature in scrotum necessary for sperm formation should be ... ..
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a) 2°C above body temperature
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b) 2° C below body temperature
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c) 4°C above body temperature
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d) 4° C below body temperature
Explanation
The temperature in scrotum necessary for sperm formation should be 2°C below body temperature. The slightly cooler temperature of the scrotum is necessary for the development of normal sperm. Answer : (b)
Q.26
Fertilizin is ... ... [ JIPMER 2003 ]
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a) Phospholipid
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b) Steroid
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c) Carbohydrate
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d) Glycoprotein
Explanation
Fertilizin is a glycoprotein whose protein part is made up of many amino acids and the carbohydrate part is composed of one or more monosaccharide sugars. Answer : (d)
Q.27
Sperm capacitation involves ... .... [ MHT CET 2007 ]
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a) Change in shape
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b) Release of mitochondria
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c) Removal of membrane fatty acids
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d) Hyaluronic acid
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.28
After ovulation, Graafian follicle forms ... ... [ CBSE 1999 ]
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a) Corpus luteum
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b) Corpus albicans
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c) Corpus artesia
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d) Corpus callosum
Explanation
Answer : (a)
Q.29
In spermatogenesis, reduction division of chromosomes occurs during conversion of ... .. [ WB 2012 ]
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a) Primary spermatocytes to secondary spermatocytes
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b) Spermatogonia to primary spermatocytes
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c) Spermatids to sperms
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d) Secondary spermatocytes to spermatids
Explanation
The primary spermatocyte divides meiotically (Meiosis I) into two secondary spermatocytes. Each secondary spermatocyte divides into two equal haploid spermatids by Meiosis II. Answer : (a)
Q.30
Glands of male reproductive system are ... ...
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a) Prostate, Cowper's and seminal
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b) Prostate and seminal vesicles
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c) Prostate, Bertholin's and seminal
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d) Seminal vesicles and Bertholin's glands
Explanation
The male accessory glands are the prostate, Cowpers (bulbourethral gland), seminal vesicles, ampullary gland and urethral glands. Answer : (a)
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