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💓💓💓DAILY✕45💓💓💓💓
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1.Which of the following gland stimulates the pituitary to release the hormone responsible for parturition?
a)Neuroendocrine gland
b)Pancreas
c)Salivary
d)Gall bladder
TOPIC:
Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed fetus and the Placenta which induces mild uterine contraction called fetal ejection reflex. This triggers the release of oxytocin from the maternal pituitary.
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2.Identify A, B, C, and D in a given diagram and select the correct statement.
a. A is analogous to the labia majora of female
b. B is a male primary sex organ that produces male gamete and secretes gonadotropic hormones
c. C is a male accessory gland that forms 60-70% of the volume of semen
d. D is also male accessory gland and its secretion helps in activation of sperms
a. A is analogous to the labia majora of female
b. B is a male primary sex organ that produces male gamete and secretes gonadotropic hormones
c. C is a male accessory gland that forms 60-70% of the volume of semen
d. D is also male accessory gland and its secretion helps in activation of sperms
a)a, b & d
b)c & d
c)b, c & d
d)a, b, c & d
Explanation
In the above diagram,
A= Vas deference, B=testis/testicles, C=seminal vesicle, D=prostate gland
a- Scrotum is analogous to the labia majora of female
b- Testis is male primary sex organ which produces male gamete and secretes gonadotropic hormones
c- seminal vesicle is a male accessory gland which forms 60-70% of the volume of semen. Sperm make up only 5 percent of the final volume of semen, the thick, milky fluid that the male ejaculates. The bulk of semen is produced by three critical accessory glands of the male reproductive system: the seminal vesicles, the prostate, and the bulbourethral glands.
d- Prostat gland is also male accessory gland and it produces prostatic fluid. This acidic fluid makes up about 20-30% of the semen. It also contains proteins with antibiotic properties that help prevent infections in the male reproductive tract.
A= Vas deference, B=testis/testicles, C=seminal vesicle, D=prostate gland
a- Scrotum is analogous to the labia majora of female
b- Testis is male primary sex organ which produces male gamete and secretes gonadotropic hormones
c- seminal vesicle is a male accessory gland which forms 60-70% of the volume of semen. Sperm make up only 5 percent of the final volume of semen, the thick, milky fluid that the male ejaculates. The bulk of semen is produced by three critical accessory glands of the male reproductive system: the seminal vesicles, the prostate, and the bulbourethral glands.
d- Prostat gland is also male accessory gland and it produces prostatic fluid. This acidic fluid makes up about 20-30% of the semen. It also contains proteins with antibiotic properties that help prevent infections in the male reproductive tract.
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3.If mammalian ovum fails to get fertilized, which one of the following is unlikely ?
Explanation
If the mammalian ovum fails to fertilize, choices (a) & (b) are obvious. Since corpus luteum declines so progesterone also decreases rapidly (progesterone is essential for maintenance of pregnancy). Also estrogen continues to cause growth of the endometrium which ultimately becomes thick enough to break down & cause menstruation. Hence choice. (c) is incorrect as estrogen secretion does not decrease further. Primary follicles continue developing irrespective of ovulatory condition.
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4.Heterogametic male condition does not occur in
Explanation
In birds usually female is designated as ZW, being heterogametic and male is designated as ZZ being homogametic.
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5.The parts of male urethra are
Explanation
Urethra carries urine from the bladder, as well as sperm from the vasa deferential through the penis. Urethra is a thick - walled, muscular duct and it is a common passage for both urine and semen; and called urinogenital duct. Urethra includes three parts - prostatic urethra, membranous urethra and penile urethra.
Key Concepts
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6.Phallic organs in cockroach are related to
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7.Testis is
Explanation
Testes are mesodermal in origin.
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8.Sperm cells are produced in
Explanation
Seminiferous tubules are highly coiled tubules found in testicular lobule of testis. It consists of spermatogonium which divide mitotically to give rise to spermatocytes. These spermatocytes on meiosis give rise to sperm cells.
73% students got it right
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9. The male sex hormone 'testosterone' is secreted by special Leydig's cells present in
Explanation
10.The Leydig cells found in the human body are the secretory source of
Explanation
69% students got it right
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11.Leydig cells are present in the mammalian.
Explanation
Leydig cells, named after the German anatomist Franz von Leydig, secrete the male hormone testosterone.
92% students got it right
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12.The cells which secrete male sex hormone testosterone are
Explanation
Explanation
Sertoli cells are found in the walls of seminiferous tubules of the testes. they anchor and provide nutrition to the developing germ cells especially the spermatids.
Key Concepts
Perfect Attempt
68% students got it right
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14.
The membranous cover of the ovum at ovulation is
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15.The Leydig cells secrete
A
Oestrogen
B
Testosterone
C
Progesterone
D
Corticosterone
Explanation
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16.
Most Important 
Previous Year
Once a single sperm cell encounters ova, which of the following blocks the entry of additional sperm
Explanation
The corona radiata is the innermost layer of the cells of the cumulus oophorus and is directly adjacent to the zona pellucida, the inner protective glycoprotein layer of the ovum. Its main purpose in many animals is to supply vital proteins to the cell.
ans is D
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17.The capsule enclosing testis of mammal is called as
Explanation62% students got it right
Each testes is externally covered by a white fibrous capsule the tunica albuginea which is produced inside the testis as fibrous septa
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18.The fold of skin covering the penis is called
Explanation
Tip of penis covered with retractile fold of skin called prepuce or fore skin
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19.Bulbourethral gland is also known as
Explanation72% students got it right
A bulbourethral gland, also called a Cowper's gland, named after the English anatomist William Cowper, is one of two small exocrine glands in the male reproductive system.
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20.The cavity present in the graafian follicle is
Explanation64% students got it right
The cavity of graafian follicle is antrum or follicular cavity having liquor folliculi and an eccentrically placed oocyte.
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21.Which of the following is the endocrine tissue of testes
Explanation
Leydig’s cells are endocrine in nature and secrete male sex hormones-androgens.
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22.Corpus luteum secretes.
Explanation
Wasted Attempt
67% students got it right
Cropus luteum is formed by the matured Graafian follicle after ovulation. Cropus luteum secretes a steroid hormone, progesterone.
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23.If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from
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24.Vasa efferentia are the ductules leading from
Explanation
The seminiferous tubules are closed at one end but on the other side they join to a network the rete testis from where fine ciliated ductules, the vasa efferentia arise. Cilia help in conducting sperms. The rete testis is a network of tubules conducting sperm from the seminiferous tubules of the testis to the vasa efferentia.
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25.In mammals, the egg when released from ovary is commonly encased in a layer of cells of ovarian origin, corona radiata. These cells are held together by a cementing substance known as
Explanation
In mammals the covering around the egg is called corona radiata. It is formed of a single layer of follicular cells, cemented together by an adhesive substances the hyaluronic acid.
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26.Cauda epididymis leads to
Explanation
Ans B41% students got it right
Vas deferens is larger duct arises from cauda epididymis and reach up to seminal vesicles.
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27.
Most ImportantProstate gland secretion helps in the formation of
Explanation78% students got it right
Prostate gland is a chestnut shaped gland which lies at the base of the bladder and surrounds the first part of urethra. It contributes an alkaline component to the seminal fluid for sperm motility. The substance made by the prostate helps the sperms to become active.
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28 .Gametogensis is the formation of
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29.
Most ImportantThe substance secreted by the corpus luteum is
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30.Process of spermatogenesis is under the regulatory influence of
Explanation
Spermatogenesis is under control of growth hormone. secretion of both L.H. and FSH is under control of GnRH of hypothalamus.
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31.Middle piece of mammalian sperm possesses
Explanation43% students got it right
Answer A
Sperm has : (i) Head in which acrosome & nucleus are present
(ii) Middle piece in which it contains many mitochondria.
(iii) A long & highly motile tail.
(A short neck is also present between middle piece & head which has centrioles and may sometimes regarded as a part of middle piece)
(ii) Middle piece in which it contains many mitochondria.
(iii) A long & highly motile tail.
(A short neck is also present between middle piece & head which has centrioles and may sometimes regarded as a part of middle piece)
Fertilisation is
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Explanation
Fusion of male and female gametes is called fertilisation. It can be external (outside the female genital tract) like frog. fishes or internal (inside the female genital tract) like mammals. birds, etc.
😀33.Which of the following gland is homologous to Bartholin's gland and helps in lubrication of penis?
Explanation43% students got it right
The male accessory glands include paired seminal vesicles, a prostate and paired (Cowper's glands) bulbourethral glands. Secretions of these glands constitute the seminal plasma which is rich in fructose, calcium and certain enzymes. The secretions of bulbourethral glands also helps in the lubrication of the penis.
Ans is C
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34.
