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All questions of Human Reproduction for NEET Exam
The main function of mammalian corpus luteum is to produce: [2014]a)estrogen onlyb)progesteronec)human chorionic gonadotropind)relaxin only Correct answer is option 'B'. Can you explain this answer?
|
Jasmin answered |
I'm also thinking that it is progesterone
Fertilization in humans is practically feasible only if [2016]- a)the sperms are transported into vagina just after the release of ovum in fallopian tube
- b)the ovum and sperms are transported simultaneously to ampullary isthmic junction of the fallopian tube
- c)the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the cervix
- d)the sperms are transported into cervix within 48 hrs of release of ovum in uterus
Correct answer is option 'B'. Can you explain this answer?
Fertilization in humans is practically feasible only if [2016]
a)
the sperms are transported into vagina just after the release of ovum in fallopian tube
b)
the ovum and sperms are transported simultaneously to ampullary isthmic junction of the fallopian tube
c)
the ovum and sperms are transported simultaneously to ampullary - isthmic junction of the cervix
d)
the sperms are transported into cervix within 48 hrs of release of ovum in uterus
|
Yash Saha answered |
(b) The word ampulla is derived from the Latin word 'flask'. Being the second portion of the fallopian tube, it is the intermediate dilated portion which immediately curves over the ovary. This is the common site of human fertilization as both the ovum and sperms are simultaneously transported here
The shared terminal duct of the reproductive and urinary system in the human male is: [2014]- a)Urethra
- b)Ureter
- c)Vas deferens
- d)Vasa efferentia
Correct answer is option 'A'. Can you explain this answer?
The shared terminal duct of the reproductive and urinary system in the human male is: [2014]
a)
Urethra
b)
Ureter
c)
Vas deferens
d)
Vasa efferentia
|
Arya Khanna answered |
(a) Urethra is a tube that connects the urinary bladder to the genitals for the removal of fluids from the body. The urethra travels through the penis, and carries semen as well as urine.
Select the correct option describing gonadotropin activity in a normal pregnant female: [2014]
- a)High level of FSH and LH stimulates the thickening of endometrium.
- b)High level of FSH and LH facilitate implantation of the embryo.
- c)High level of hCG stimulates the synthesis of estrogen and progesterone.
- d)High level of hCG stimulates the thickening of endometrium.
Correct answer is option 'C'. Can you explain this answer?
Select the correct option describing gonadotropin activity in a normal pregnant female: [2014]
a)
High level of FSH and LH stimulates the thickening of endometrium.
b)
High level of FSH and LH facilitate implantation of the embryo.
c)
High level of hCG stimulates the synthesis of estrogen and progesterone.
d)
High level of hCG stimulates the thickening of endometrium.
|
Nilanjan Chakraborty answered |
(c) Synthesis of estrogen and progesterone due to high level of hCG is a normal gonadotropic activity in a normal pregnant female.
Which of the following cells during gametogenesis is normally dipoid? [2015 RS]- a)Spermatid
- b)Spermatogonia
- c)Secondary polar body
- d)Primary polar body
Correct answer is option 'B'. Can you explain this answer?
Which of the following cells during gametogenesis is normally dipoid? [2015 RS]
a)
Spermatid
b)
Spermatogonia
c)
Secondary polar body
d)
Primary polar body
|
Dipanjan Mehta answered |
(b) During gametogenesis, spermatogonia are diploid because of undergoing the process of meiosis.
Select the incorrect statement : [2016]- a)FSH stimulates the sertoli cells which help in spermiogenesis
- b)LH triggers ovulation in ovary
- c)LH and FSH decrease gradually during the follicular phase
- d)LH triggers secretion of androgens from the Leydig cells
Correct answer is option 'C'. Can you explain this answer?
Select the incorrect statement : [2016]
a)
FSH stimulates the sertoli cells which help in spermiogenesis
b)
LH triggers ovulation in ovary
c)
LH and FSH decrease gradually during the follicular phase
d)
LH triggers secretion of androgens from the Leydig cells
|
Aman Sharma answered |
(c) Considering the female reproductive endocrinology, ovulation is the process of the monthly release of the viable oocyte from the ovary between the time of menarche and menopause. During this time, there is a surge in the production of LH and FSH, termed as gonadotropins, thereby initiating estradiol and progesterone secretion from the ovary. Both these hormones are very important for the menstrual cycle.
Which one of the following statements is incorrect about menstruation?[2008]- a)During normal menstruation about 40 ml blood is lost
- b)The menstrual fluid can easily clot
- c)At menopause in the female, there is especially abrupt increase in gonadotropic hormones
- d)The beginning of the cycle of menstruation is called menarche
Correct answer is option 'B'. Can you explain this answer?
Which one of the following statements is incorrect about menstruation?
[2008]
a)
During normal menstruation about 40 ml blood is lost
b)
The menstrual fluid can easily clot
c)
At menopause in the female, there is especially abrupt increase in gonadotropic hormones
d)
The beginning of the cycle of menstruation is called menarche
|
Shanaya Rane answered |
In human female, the periodic discharge of blood, mucus and cellular debris from uterine wall from non-pregnant women of sexual maturity is known as menstrual cycle. Few hours before the start of mensuration, the spiral arterioles constrict one by one resulting into the blanch mucosa. The mucosa shrinks and the death of the blood deprived tissues takes place.
In humans, at the end of the first meiotic division, the male germ cells differentiate into the[2008]- a)primary spermatocytes
- b)secondary spermatocytes
- c)spermatids
- d)spermatozonia
Correct answer is option 'B'. Can you explain this answer?
In humans, at the end of the first meiotic division, the male germ cells differentiate into the
[2008]
a)
primary spermatocytes
b)
secondary spermatocytes
c)
spermatids
d)
spermatozonia
|
Sonal Kulkarni answered |
In human, at the end of the first meiotic division, the male germ cells differentrate into the secondary.
Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female? [2009]
- a)Maintenance of the hypertrophical endometrial lining
- b)Fertilisation of the ovum
- c)Retention of well -developed corpus luteum
- d)Maintenance of high concentration of sex hormones in the blood stream
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female? [2009]
a)
Maintenance of the hypertrophical endometrial lining
b)
Fertilisation of the ovum
c)
Retention of well -developed corpus luteum
d)
Maintenance of high concentration of sex hormones in the blood stream
|
Pallabi Reddy answered |
Fertilization of ovum is the most likely root cause why menstruation is not taking place in regularly cycling human female. In order for fertilization to occur, one of these sperm must attach itself to the ovum and penetrate its outer surface. The fertilized ovum will then continue travelling down the fallopian tube, taking several days until it reaches the uterus. When it arrives, it attaches itself to the lining of the uterus and continues to grow. If the ovum is not fertilized it will die and the progesterone and oestrogen hormone levels will drop. Without these hormones the prepared uterus lining breaks up and is released through the vagina. This is known as a ‘period’.
Seminal plasma in humans is rich in
[2009]
- a)glucose and certain enzymes but has no calcium
- b)fructose and calcium but has no enzymes
- c)fructose, calcium and certain enzymes
- d)fructose and certain enzymes but poor in calcium
Correct answer is option 'C'. Can you explain this answer?
Seminal plasma in humans is rich in
[2009]
a)
glucose and certain enzymes but has no calcium
b)
fructose and calcium but has no enzymes
c)
fructose, calcium and certain enzymes
d)
fructose and certain enzymes but poor in calcium
|
Aashna Mukherjee answered |
Human seminal plasma is a complex mixture of proteins, glycoproteins, pe ptides, glycope ptides, and prostaglandins secreted by organs of the male reproductive tract. The components of this fluid have been implicated in the suppression of immune response, agonistic effects on sperm-egg binding, and promotion of successful implantation of the human embryo. Seminal plasma in humans is rich in fructose and certain enzymes but poor in calcium.
Vasa efferentia are the ductules leading from[2010]- a)testicular lobules to rete testis
- b)rete testis to vas deferens
- c)vas deferens to epididymis
- d)epididymis to urethra
Correct answer is option 'B'. Can you explain this answer?
Vasa efferentia are the ductules leading from
[2010]
a)
testicular lobules to rete testis
b)
rete testis to vas deferens
c)
vas deferens to epididymis
d)
epididymis to urethra
|
Pooja Saha answered |
Vasa efferentia are ductules leading from rete testis to vas deferens. The rete testis is an anastomosing network of tubules located in the hilum of the testicles that carries sperm from the seminiferous tubules to the vasa efferentia.
Receptors for sperm binding in mammals are present on: (2021)- a)Perivitelline space
- b) Zona pellucida
- c)Corona radiata
- d)Vitelline membrane
Correct answer is option 'B'. Can you explain this answer?
Receptors for sperm binding in mammals are present on: (2021)
a)
Perivitelline space
b)
Zona pellucida
c)
Corona radiata
d)
Vitelline membrane
|
Mira Joshi answered |
The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.
Which of these is not an important component of initiation of parturition in humans ? [2015 RS]- a)Synthesis of prostaglandins
- b)Release of oxytocin
- c)Release of prolactin
- d)Increase in estrogen and progesterone ratio
Correct answer is option 'C'. Can you explain this answer?
Which of these is not an important component of initiation of parturition in humans ? [2015 RS]
a)
Synthesis of prostaglandins
b)
Release of oxytocin
c)
Release of prolactin
d)
Increase in estrogen and progesterone ratio
|
Rajesh Datta answered |
(c) The role of prolactin is not concerned with initiation of parturition in humans. Prolactin is responsible for milk synthesis in mammary glands. When the levels of estrogen and progesterone become low at parturition, then anterior pituitary activates to release prolactin.
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle? (2020)- a)Low concentration of LH
- b)Low concentration of FSH
- c)High concentration of Estrogen
- d)High concentration of Progesterone
Correct answer is option 'C'. Can you explain this answer?
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle? (2020)
a)
Low concentration of LH
b)
Low concentration of FSH
c)
High concentration of Estrogen
d)
High concentration of Progesterone
|
Ananya Das answered |
LH (Leutenizing hormone) is produced by pituitary gland in the brain. It triggers ovulation & promotes the development of corpus luteum by rupture of graafian follicle. Which high concentration of estrogen is relesed by moture graafian follicle
The permissible use of the technique amniocentesis is for
[2010]
- a)Detecting sex of the unborn foetus
- b)Artificial insemination
- c)Transfer of embryo into the uterus of the surrogate mother
- d)Detecting genetic abnormality
Correct answer is option 'D'. Can you explain this answer?
The permissible use of the technique amniocentesis is for
[2010]
a)
Detecting sex of the unborn foetus
b)
Artificial insemination
c)
Transfer of embryo into the uterus of the surrogate mother
d)
Detecting genetic abnormality
|
Arindam Khanna answered |
Amniocentesis is a medical procedure in which amniotic fluid (the protective fluid seen around the foetus) is used to detect the genetic abnormality of the foetus.
This procedure can also be used to detect the sex of the unborn foetus, but, this is unethical and is not allowed to do. Therefore, the permissible use of the technique "amniocentesis" is detecting genetic abnormality.
This procedure can also be used to detect the sex of the unborn foetus, but, this is unethical and is not allowed to do. Therefore, the permissible use of the technique "amniocentesis" is detecting genetic abnormality.
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy? [2010]
- a)Fourth month
- b)Fifth month
- c)Sixth month
- d)Third month
Correct answer is option 'B'. Can you explain this answer?
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy? [2010]
a)
Fourth month
b)
Fifth month
c)
Sixth month
d)
Third month
|
Dipanjan Choudhary answered |
The appearance of hair on the head of the foetus and the first movements are important milestones in pregnancy. The correct answer to this question is option B, which is the fifth month.
Explanation:
The development of the foetus during pregnancy is a gradual process that occurs in different stages. Here are some of the key milestones that occur during the fifth month of pregnancy:
1. Foetal movements:
During the fifth month, the foetus begins to move more actively in the womb. These movements may be felt by the mother as "flutters" or "butterflies" in the stomach. As the foetus grows, its movements will become more noticeable and may even keep the mother awake at night.
2. Appearance of hair:
By the fifth month of pregnancy, the foetus will have developed fine hair on its head. This hair is called lanugo and is usually shed before birth. The lanugo helps to regulate the body temperature of the foetus and protect its skin from the amniotic fluid.
3. Development of the nervous system:
During the fifth month, the nervous system of the foetus continues to develop. The brain and spinal cord are becoming more complex, and the foetus is starting to develop its sense of touch, taste, and smell.
4. Growth and development:
By the fifth month of pregnancy, the foetus is about 10 inches long and weighs around 10 ounces. It is starting to look more like a baby, with distinct facial features and limbs that can move independently.
In conclusion, the appearance of hair on the head of the foetus and the first movements are usually observed during the fifth month of pregnancy. This is an exciting time for expectant parents as they begin to feel the presence of their growing baby.
Explanation:
The development of the foetus during pregnancy is a gradual process that occurs in different stages. Here are some of the key milestones that occur during the fifth month of pregnancy:
1. Foetal movements:
During the fifth month, the foetus begins to move more actively in the womb. These movements may be felt by the mother as "flutters" or "butterflies" in the stomach. As the foetus grows, its movements will become more noticeable and may even keep the mother awake at night.
2. Appearance of hair:
By the fifth month of pregnancy, the foetus will have developed fine hair on its head. This hair is called lanugo and is usually shed before birth. The lanugo helps to regulate the body temperature of the foetus and protect its skin from the amniotic fluid.
3. Development of the nervous system:
During the fifth month, the nervous system of the foetus continues to develop. The brain and spinal cord are becoming more complex, and the foetus is starting to develop its sense of touch, taste, and smell.
4. Growth and development:
By the fifth month of pregnancy, the foetus is about 10 inches long and weighs around 10 ounces. It is starting to look more like a baby, with distinct facial features and limbs that can move independently.
In conclusion, the appearance of hair on the head of the foetus and the first movements are usually observed during the fifth month of pregnancy. This is an exciting time for expectant parents as they begin to feel the presence of their growing baby.
Which one of the following statements about human sperm is correct?[2010]- a)Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation
- b)The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
- c)Acrosome serves as a sensory structure leading the sperm towards the ovum
- d)Acrosome serves no particular function
Correct answer is option 'B'. Can you explain this answer?
Which one of the following statements about human sperm is correct?
[2010]
a)
Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation
b)
The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
c)
Acrosome serves as a sensory structure leading the sperm towards the ovum
d)
Acrosome serves no particular function
|
Rhea Sarkar answered |
Acrosome a small pointed structure at the tip of nucleus. It breaks down just before fertilization, releasing hydrolytic enzymes that assist penetration between follicle cells that surrounds the ovum, thus facilitating fertilization.
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy? (2021)- a)Foetus
- b)Uterus
- c)Graafian follicle
- d)Corpus luteum
Correct answer is option 'D'. Can you explain this answer?
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy? (2021)
a)
Foetus
b)
Uterus
c)
Graafian follicle
d)
Corpus luteum
|
|
Mira Joshi answered |
In the later phase of pregnancy, a hormone called relaxin is also secreted by the ovary.
If for some reason, the vasa efferentia in the human reproductive system gets blocked, the gametes will not be transported from[2011]- a)testes to epididymis
- b)epididymis to vas deferens
- c)ovary to uterus
- d)vagina to uterus
Correct answer is option 'A'. Can you explain this answer?
If for some reason, the vasa efferentia in the human reproductive system gets blocked, the gametes will not be transported from
[2011]
a)
testes to epididymis
b)
epididymis to vas deferens
c)
ovary to uterus
d)
vagina to uterus
|
|
Shanaya Rane answered |
If the vasa efferentiain the human reproductive system get blocked the gametes will not be transformed from testes to epididymis.
Which extra-embryonic membrane in humans prevents desiccation of the embryo inside the uterus?[2008]- a)Chorion
- b)Allantois
- c)Yolk sac
- d)Amnion
Correct answer is option 'D'. Can you explain this answer?
Which extra-embryonic membrane in humans prevents desiccation of the embryo inside the uterus?
[2008]
a)
Chorion
b)
Allantois
c)
Yolk sac
d)
Amnion
|
|
Shanaya Rane answered |
Amnion is an extraembryonic membrane in human prevents desiccation of the embryo inside the uterus. Amnion is a membrane that encloses the embryo of reptiles, birds and mammals within the amniotic cavity. This cavity is filled with amniotic fluid, in which the embryo is protected from dessication and from external pressure.
Which one of the following is the correct matching of the events occurring during menstrual cycle?[2009]- a)Proliferative phase: Rapid regeneration of myometrium and maturation of Graffian follicle.
- b)Development of corpus luteum : Secretory phase and increased secretion of progesterone.
- c)Menstruation : Break down of myometrium and ovum not fertilised.
- d)Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone.
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is the correct matching of the events occurring during menstrual cycle?
[2009]
a)
Proliferative phase: Rapid regeneration of myometrium and maturation of Graffian follicle.
b)
Development of corpus luteum : Secretory phase and increased secretion of progesterone.
c)
Menstruation : Break down of myometrium and ovum not fertilised.
d)
Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone.
|
Anand Jain answered |
The corpus luteum is essential for establishing and maintaining pregnancy in females. In the ovary, the corpus luteum secretes estrogens and progesterone, which are steroid hormones responsible for the thickening of the endometrium and its development and maintenance, respectively.
The part of fallopian tube closest to the ovary is[2010]- a)isthmus
- b)infundibulum
- c)cervix
- d)ampulla
Correct answer is option 'B'. Can you explain this answer?
The part of fallopian tube closest to the ovary is
[2010]
a)
isthmus
b)
infundibulum
c)
cervix
d)
ampulla
|
Mrinalini Bajaj answered |
The part of fallopian tube closest to the ovary is infundibulum. Infundibulum possess finger-like projections called fimbriae that help in collection of ovum after ovulation. It leads to wider part of oviduct called ampulla. The last part of oviduct is isthmus that has a narrow lumen and joins the uterus.
Given below is a diagrammatic sketch of a portion of human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D.
[2009]- a)vas deferens (A); seminal vesicle (B) prostate (C); bulbourethral gland (D).
- b)vas deferens (A); seminal vesicle (B) bulbourethral gland (C); prostate (D).
- c)ureter (A); seminal vesicle (B); prostate (C); bulbourethral gland (D)
- d)ureter (A); prostate(B); seminal vesicle (C); bulbourethral gland (D)
Correct answer is option 'A'. Can you explain this answer?
Given below is a diagrammatic sketch of a portion of human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D.
[2009]
a)
vas deferens (A); seminal vesicle (B) prostate (C); bulbourethral gland (D).
b)
vas deferens (A); seminal vesicle (B) bulbourethral gland (C); prostate (D).
c)
ureter (A); seminal vesicle (B); prostate (C); bulbourethral gland (D)
d)
ureter (A); prostate(B); seminal vesicle (C); bulbourethral gland (D)
|
Surbhi Das answered |
The human male reproductive system consists of a number of sex organs that are a part of the human reproductive process. In diagram of male reproductive system of human, the point indicated by A,B,C,D are vas deferens, seminal vesicle, prostate and bulbourethral gland.
Foetal ejection reflex in human female is induced by[2009]- a)release oxytocin from pituitary
- b)fully developed foetus and placenta
- c)differentiation of mammary glands
- d)pressure exerted by amniotic fluid
Correct answer is option 'B'. Can you explain this answer?
Foetal ejection reflex in human female is induced by
[2009]
a)
release oxytocin from pituitary
b)
fully developed foetus and placenta
c)
differentiation of mammary glands
d)
pressure exerted by amniotic fluid
|
Muskaan Basak answered |
Foetal ejection reflex in human female is induced by fully developed foetus and placenta. When a woman is in a lithotomy or semi-sitting position, the Foetal Ejection Reflex is impaired and the increased pain caused by the sacrum’s inability to move as the baby descends can be intolerable.
The signals for parturition originate from[2010]- a)placenta only
- b)placenta as well as fully developed foetus
- c)oxytocin released from maternal pituitary
- d)fully developed foetus only
Correct answer is option 'B'. Can you explain this answer?
The signals for parturition originate from
[2010]
a)
placenta only
b)
placenta as well as fully developed foetus
c)
oxytocin released from maternal pituitary
d)
fully developed foetus only
|
Sneha Basak answered |
Parturition is the process of delivery of the foetus. The signals for parturition originate from the fully developed foetus and placenta that induce uterine contraction called foetal ejection reflex. This triggers the release of oxytocin hormone from pituitary. This in turn leads to expulsion of the baby out of uterus.
In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?[2010]- a)Embryo only, upto 8 cell stage
- b)Either zygote or early embryo upto 8 cell stage
- c)Embryo of 32 cell stage
- d)Zygote only
Correct answer is option 'A'. Can you explain this answer?
In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?
[2010]
a)
Embryo only, upto 8 cell stage
b)
Either zygote or early embryo upto 8 cell stage
c)
Embryo of 32 cell stage
d)
Zygote only
|
Soumya Ahuja answered |
In vitro fertilization is a process where fertilization of egg occurs outside the mother’s womb. This method is used as a major treatment for infertility. This method involves the removal of eggs from the female ovaries. This egg is then allowed to fertilize with sperm in a fluid medium in a test tube. The zygote is allowed to develop for a week. Either zygote or early embryo up to 8 blastomeres is then transferred into the fallopian tube to complete its further development. If the embryo is with more than 8 blastomeres, it is transferred into uterus for successful pregnancy. A baby conceived by fertilization that occurs outside mother body is called test tube baby.
Given below are two statements: (2022)
Statement I: The release of sperms into the seminiferous tubules is called spermiation.
Statement II: Spermiogenesis is the process of formation of sperms from spermatogonia.
In the light of the above statements, choose the most appropriate answer from the options given below :- a)Statement I is correct but Statement II is incorrect
- b)Statement I is incorrect but Statement II is correct
- c)Both Statement I and Statement II are correct
- d)Both Statement I and Statement II are incorrect
Correct answer is option 'A'. Can you explain this answer?
Given below are two statements: (2022)
Statement I: The release of sperms into the seminiferous tubules is called spermiation.
Statement II: Spermiogenesis is the process of formation of sperms from spermatogonia.
In the light of the above statements, choose the most appropriate answer from the options given below :
Statement I: The release of sperms into the seminiferous tubules is called spermiation.
Statement II: Spermiogenesis is the process of formation of sperms from spermatogonia.
In the light of the above statements, choose the most appropriate answer from the options given below :
a)
Statement I is correct but Statement II is incorrect
b)
Statement I is incorrect but Statement II is correct
c)
Both Statement I and Statement II are correct
d)
Both Statement I and Statement II are incorrect
|
Dhruba Mukherjee answered |
Understanding the Statements
To evaluate the correctness of the statements regarding spermatogenesis, let’s analyze each one:
Statement I: Spermiation
- Definition: Spermiation is the process by which mature spermatozoa are released from the Sertoli cells into the seminiferous tubules.
- Correctness: This statement is accurate. Spermiation is indeed the term used for the release of sperm into the seminiferous tubules, marking a crucial step in sperm development.
Statement II: Spermiogenesis
- Definition: Spermiogenesis refers to the final stage of spermatogenesis where spermatids undergo transformation into mature spermatozoa.
- Incorrect Description: The statement incorrectly describes spermiogenesis as the process of formation of sperms from spermatogonia. The correct term for the entire process from spermatogonia to spermatids is spermatogenesis, while spermiogenesis specifically deals with the transformation of spermatids to spermatozoa.
Conclusion
- Based on the analysis:
- Statement I is correct.
- Statement II is incorrect.
Thus, the correct answer is option 'A': Statement I is correct but Statement II is incorrect. This reflects a clear understanding of the definitions and processes involved in male gametogenesis.
To evaluate the correctness of the statements regarding spermatogenesis, let’s analyze each one:
Statement I: Spermiation
- Definition: Spermiation is the process by which mature spermatozoa are released from the Sertoli cells into the seminiferous tubules.
- Correctness: This statement is accurate. Spermiation is indeed the term used for the release of sperm into the seminiferous tubules, marking a crucial step in sperm development.
Statement II: Spermiogenesis
- Definition: Spermiogenesis refers to the final stage of spermatogenesis where spermatids undergo transformation into mature spermatozoa.
- Incorrect Description: The statement incorrectly describes spermiogenesis as the process of formation of sperms from spermatogonia. The correct term for the entire process from spermatogonia to spermatids is spermatogenesis, while spermiogenesis specifically deals with the transformation of spermatids to spermatozoa.
Conclusion
- Based on the analysis:
- Statement I is correct.
- Statement II is incorrect.
Thus, the correct answer is option 'A': Statement I is correct but Statement II is incorrect. This reflects a clear understanding of the definitions and processes involved in male gametogenesis.
A change in the amount of yolk and its distribution in the egg will affect[2009]- a)pattern of cleavage
- b)number of blastomeres produced
- c)fertilization
- d)formation of zygote
Correct answer is option 'A'. Can you explain this answer?
A change in the amount of yolk and its distribution in the egg will affect
[2009]
a)
pattern of cleavage
b)
number of blastomeres produced
c)
fertilization
d)
formation of zygote
|
|
Arindam Khanna answered |
A change in the amount of yolk and its distribution in the egg will affect pattern of cleavage. The pattern of cleavage is influenced by the amount of yolk in the egg. In eggs with less yolk, cleavages are equal, and the resulting blastomeres are of similar size. If the yolk is localized, such as in frog eggs, then clevages are unequal, the cells derived from the yolky region (the vegetal pole) are larger than those derived from the region without yolk (the animal pole).
What happens during fertilisation in humans after many sperms reach close to the ovum?[2011M]- a)Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
- b)All sperms except the one nearest to the ovum lose their tails
- c)Cells of corona radiata trap all the sperms except one
- d)Only two sperms nearest the ovum penetrate zona pellucida
Correct answer is option 'A'. Can you explain this answer?
What happens during fertilisation in humans after many sperms reach close to the ovum?
[2011M]
a)
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
b)
All sperms except the one nearest to the ovum lose their tails
c)
Cells of corona radiata trap all the sperms except one
d)
Only two sperms nearest the ovum penetrate zona pellucida
|
Priyanka Iyer answered |
During fertilisation in humans, many sperms reach close to the ovum. As sperm comes in contact with the zona pellucida layer of the ovum it induces changes in the membrane that blocks the entry of additional sperm. The secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.
At which stage of life the oogenesis process is initiated? (2022)- a)Birth
- b)Adult
- c)Puberty
- d)Embryonic development stage
Correct answer is option 'D'. Can you explain this answer?
At which stage of life the oogenesis process is initiated? (2022)
a)
Birth
b)
Adult
c)
Puberty
d)
Embryonic development stage
|
Poulomi Kaur answered |
Oogenesis Initiation Stage
Oogenesis is the process of egg cell (oocyte) development in females. This intricate process begins during the embryonic development stage.
Embryonic Development Stage
- Oogenesis starts in the female embryo while it is still developing in the womb.
- Primordial germ cells migrate to the developing ovaries and differentiate into oogonia.
- These oogonia undergo mitotic divisions, increasing their numbers.
Primary Oocytes Formation
- By the end of the embryonic stage, oogonia enter the first meiotic division and become primary oocytes.
- Each primary oocyte is surrounded by a layer of follicular cells, forming a structure known as a primordial follicle.
- Importantly, primary oocytes are arrested in prophase I of meiosis until puberty.
Developmental Arrest
- The primary oocytes remain dormant in the ovaries until the female reaches puberty.
- At puberty, hormonal changes stimulate the maturation of these oocytes, leading to the menstrual cycle.
Conclusion
In summary, oogenesis is initiated during the embryonic development stage, making option 'D' the correct answer. This early onset is crucial for the eventual production of eggs that can be fertilized, forming the basis for reproduction in females. Understanding oogenesis is essential for fields such as reproductive biology and medicine, particularly in relation to fertility and developmental disorders.
Oogenesis is the process of egg cell (oocyte) development in females. This intricate process begins during the embryonic development stage.
Embryonic Development Stage
- Oogenesis starts in the female embryo while it is still developing in the womb.
- Primordial germ cells migrate to the developing ovaries and differentiate into oogonia.
- These oogonia undergo mitotic divisions, increasing their numbers.
Primary Oocytes Formation
- By the end of the embryonic stage, oogonia enter the first meiotic division and become primary oocytes.
- Each primary oocyte is surrounded by a layer of follicular cells, forming a structure known as a primordial follicle.
- Importantly, primary oocytes are arrested in prophase I of meiosis until puberty.
Developmental Arrest
- The primary oocytes remain dormant in the ovaries until the female reaches puberty.
- At puberty, hormonal changes stimulate the maturation of these oocytes, leading to the menstrual cycle.
Conclusion
In summary, oogenesis is initiated during the embryonic development stage, making option 'D' the correct answer. This early onset is crucial for the eventual production of eggs that can be fertilized, forming the basis for reproduction in females. Understanding oogenesis is essential for fields such as reproductive biology and medicine, particularly in relation to fertility and developmental disorders.
Which one of the following statements about morula in humans is correct?[2010]- a)It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
- b)It has far less cytoplasm as well as less DNA than in an uncleaved zygote
- c)It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
- d)It has more cytoplasm and more DNA than an uncleaved zygote
Correct answer is option 'A'. Can you explain this answer?
Which one of the following statements about morula in humans is correct?
[2010]
a)
It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
b)
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
c)
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
d)
It has more cytoplasm and more DNA than an uncleaved zygote
|
|
Sonal Kulkarni answered |
Morula is a solid ball contained within the zone pellucida. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA.
Given below are two statements: (2023)
Statement I: Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.
Statement Il: The cavity of the cervix is called cervical canal which along with vagina forms birth canal.
In the light of the above statements, choose the correct answer from the options given below:- a)Both Statement I and Statement II are true.
- b)Both Statement I and Statement II are false.
- c)Statement I is correct but Statement II is false.
- d)Statement I is incorrect but Statement II is true.
Correct answer is option 'A'. Can you explain this answer?
Given below are two statements: (2023)
Statement I: Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.
Statement Il: The cavity of the cervix is called cervical canal which along with vagina forms birth canal.
In the light of the above statements, choose the correct answer from the options given below:
Statement I: Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.
Statement Il: The cavity of the cervix is called cervical canal which along with vagina forms birth canal.
In the light of the above statements, choose the correct answer from the options given below:
a)
Both Statement I and Statement II are true.
b)
Both Statement I and Statement II are false.
c)
Statement I is correct but Statement II is false.
d)
Statement I is incorrect but Statement II is true.
|
Lead Academy answered |
Option (a) is the correct answer to this question because statement I and statement II both are correct. Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct. The cavity of cervix is called cervical canal which along with vagina forms the birth canal.
The second maturation division of the mammalian ovum occurs[2010]- a)shortly after ovulation before the ovum makes entry into the fallopian tube
- b)until after the ovum has been penetrated by a sperm
- c)until the nucleus of the sperm has fused with that of the ovum
- d)in the graafian follicle following the first maturation division
Correct answer is option 'B'. Can you explain this answer?
The second maturation division of the mammalian ovum occurs
[2010]
a)
shortly after ovulation before the ovum makes entry into the fallopian tube
b)
until after the ovum has been penetrated by a sperm
c)
until the nucleus of the sperm has fused with that of the ovum
d)
in the graafian follicle following the first maturation division
|
Dipanjan Chawla answered |
In Oogenesis, the second maturation division occurs until after the ovum has been penetrated by a sperm. Oogenesis involves the formation of haploid female gametes, ova, from this diploid egg mother cells, oogonia of ovary of female organism.
The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testes is:[2009]- a)spermatogonia - spermatocyte - spermatid -sperms
- b)spermatid - spermatocyte - spermatogonia - sperms
- c)spermatogonia - spermatid - spermatocyte - sperms
- d)spermatocyte - spermatogonia - spermatid - sperms
Correct answer is option 'A'. Can you explain this answer?
The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testes is:
[2009]
a)
spermatogonia - spermatocyte - spermatid -sperms
b)
spermatid - spermatocyte - spermatogonia - sperms
c)
spermatogonia - spermatid - spermatocyte - sperms
d)
spermatocyte - spermatogonia - spermatid - sperms
|
|
Priyanka Iyer answered |
The formation of sperms in mature human testes completed in three important phases in gametogenesis- multiplication, growth and maturation phase. During these phases primarily germ cells change into spermatogonia then spermatocyte during growth phase which change into spermatoids and spermatids into sperms.
The figure given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which one set of three parts out of I-VI have been correctly identified ? [2011]
- a)(II) Endometrium(III) Infundibulum, (IV) Fimbriae
- b)(III) Infundibulum, (IV) Fimbriae, (V) Cervix,
- c)(IV) Oviducal funnel, (V) Uterus, (VI) Cervix
- d)(I) Perimetrium, (II)Myometrium, (Ill) Fallopian tube
Correct answer is option 'B'. Can you explain this answer?
The figure given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which one set of three parts out of I-VI have been correctly identified ? [2011]
a)
(II) Endometrium(III) Infundibulum, (IV) Fimbriae
b)
(III) Infundibulum, (IV) Fimbriae, (V) Cervix,
c)
(IV) Oviducal funnel, (V) Uterus, (VI) Cervix
d)
(I) Perimetrium, (II)Myometrium, (Ill) Fallopian tube
|
Swara Desai answered |
The Fallopian tube is about 10-20 cm long and extends from the periphery of each ovary to the uterus. The part closer to the ovary is funnel-shaped and is called the infundibulum. The edges of the infundibulum possess finger-like projections called fimbriae, which help in the collection of the ovum after ovulation. the uterus opens into the vagina through a narrow cervix.
The testes in humans are situated outside the abdominal cavity insides pouch called scrotum. The purpose served is for[2011]- a)maintaining the scrotal temperature lower than the internal body temperature
- b)escaping any possible compression by the visceral organs
- c)providing more space for the growth of epididymis
- d)providing a secondary sexual feature for exhibiting the male sex
Correct answer is option 'A'. Can you explain this answer?
The testes in humans are situated outside the abdominal cavity insides pouch called scrotum. The purpose served is for
[2011]
a)
maintaining the scrotal temperature lower than the internal body temperature
b)
escaping any possible compression by the visceral organs
c)
providing more space for the growth of epididymis
d)
providing a secondary sexual feature for exhibiting the male sex
|
|
Arya Khanna answered |
The testes are present in the scrotum which maintains the scrotal temperature below 2ºC of the internal body temperature.
Seminal plasma in human males is rich in :[2010]- a)fructose and calcium
- b)glucose and calcium
- c)DNA and testosterone
- d)ribose and potassium
Correct answer is option 'A'. Can you explain this answer?
Seminal plasma in human males is rich in :
[2010]
a)
fructose and calcium
b)
glucose and calcium
c)
DNA and testosterone
d)
ribose and potassium
|
|
Swara Desai answered |
Seminal plasma in human males are rich in fructose, calcium and certain enzymes. They provide a medium for transport of sperms, nourishes and activates sperms.
Identify the correct option (A), (B), (C), (D) with respect to spermatogenesis. (2024)
- a)FSH, Leydig cells, Sertoli cells, spermiogenesis.
- b)ICSH, Interstitial cells, Leydig cells, spermiogenesis.
- c)FSH, Sertoli cells, Leydig cells, spermatogenesis.
- d)ICSH, Leydig cells, Sertoli cells, spermatogenesis.
Correct answer is option 'A'. Can you explain this answer?
Identify the correct option (A), (B), (C), (D) with respect to spermatogenesis. (2024)
a)
FSH, Leydig cells, Sertoli cells, spermiogenesis.
b)
ICSH, Interstitial cells, Leydig cells, spermiogenesis.
c)
FSH, Sertoli cells, Leydig cells, spermatogenesis.
d)
ICSH, Leydig cells, Sertoli cells, spermatogenesis.
|
|
Lead Academy answered |
The correct answer is option no. (A) as
(A) is FSH which is a pituitary hormone.
(B) is Leydig cells which are found in the interstitial space outside of the seminiferous tubules.
(C) is Sertoli cells are found inside the seminiferous tubules.
(D) is Spermiogenesis which is a process that helps in transformation of spermatids into spermatozoa.
(A) is FSH which is a pituitary hormone.
(B) is Leydig cells which are found in the interstitial space outside of the seminiferous tubules.
(C) is Sertoli cells are found inside the seminiferous tubules.
(D) is Spermiogenesis which is a process that helps in transformation of spermatids into spermatozoa.
Sertoli cells are found in[2010]- a)ovaries and secrete progesterone
- b)adrenal cortex and secrete adrenaline
- c)seminiferous tubules and provide nutrition to germ cells
- d)pancreas and secrete cholecystokinin
Correct answer is option 'C'. Can you explain this answer?
Sertoli cells are found in
[2010]
a)
ovaries and secrete progesterone
b)
adrenal cortex and secrete adrenaline
c)
seminiferous tubules and provide nutrition to germ cells
d)
pancreas and secrete cholecystokinin
|
|
Arya Khanna answered |
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.
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Biology 31 Years NEET Chapterwise Solved Papers
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