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Zoology
Human Reproduction
99 questions · Click an option and press Check Answer to reveal the result
1
Secretion of which gland helps in the lubrication of the penis?
A
Prostate
B
Seminal vesicle
C
Bulbourethral (Cowper's) gland
D
Leydig cells
2
The sex of the fetus is determined by:
A
The mother
B
The father
C
Both parents equally
D
The environment
3
GnRH (Gonadotropin Releasing Hormone) levels increase at puberty and act on:
A
Posterior pituitary
B
Anterior pituitary
C
Testis directly
D
Ovary directly
4
The embryo with 8 to 16 blastomeres is called a:
A
Blastocyst
B
Morula
C
Gastrula
D
Trophoblast
5
The process of child birth is called parturition which is induced by a complex neuroendocrine mechanism involving which of the following?
A
GnRH
B
Cortisol
C
FSH
D
Prolactin
6
During the 8th month of pregnancy, testes descend into the scrotal sac through:
A
Haversian canal
B
Central canal
C
Umbilical cord
D
Inguinal canal
7
Spermiogenesis is the process of:
A
Formation of spermatogonia
B
Transformation of spermatids into spermatozoa
C
Release of sperms from seminiferous tubules
D
Formation of secondary spermatocytes
8
Cells undergoing spermiogenesis:
A
Spermatogonia
B
Primary spermatocyte
C
Spermatid
D
Secondary spermatocyte
9
The acrosome of the sperm contains:
A
Mitochondria for energy
B
Genetic material (DNA)
C
Enzymes that help in fertilization
D
Centrioles for cell division
10
The signals for parturition originate from:
A
The mother's pituitary only
B
The fully developed fetus and the placenta
C
The ovary
D
The hypothalamus
11
Finger-like projections that appear on the trophoblast after implantation are:
A
Fimbriae
B
Chorionic villi
C
Placenta
D
Umbilical cord
12
Incorrect statement:
A
Male system in pelvis
B
Spermatogonia diploid
C
Primary oocyte completes second meiosis
D
Urethra opens outside
13
The process of delivery of the fetus (childbirth) is called:
A
Gestation
B
Lactation
C
Parturition
D
Insemination
14
A woman whose pituitary gets damaged can have a baby if she is given
A
20 mg of estrogen and progesterone each day for 14 days
B
Small quantity of estrogen every day for 28 day after evolution
C
Small quantity of FSH and LH each day and large dose of LH on fifteenth day
D
Small quantity of FSH and LH each day
15
In the absence of fertilization, the corpus luteum:
A
Grows larger
B
Degenerates
C
Secretes more estrogen
D
Stops the menstrual cycle
16
Odd man out:
A
Epididymis
B
Bartholin's glands
C
Seminal vesicle
D
Prostate gland
17
Viviparous means:
A
Egg laying
B
Live birth
C
Asexual reproduction
D
External fertilisation
18
The first menstruation begins at puberty and is called:
A
Menopause
B
Menarche
C
Ovulation
D
Gestation
19
Match sperm structure:
A
A-IV, B-II, C-I, D-III
B
A-I, B-III, C-II, D-IV
C
A-II, B-III, C-I, D-IV
D
A-III, B-I, C-II, D-IV
20
Blocked vasa efferentia affects transport:
A
Rete testis → epididymis
B
Epididymis → vas deferens
C
Ovary → uterus
D
Vagina → uterus
21
Statements: I: LH acts on Leydig cells II: Ovary stroma has cortex & medulla
A
I correct II incorrect
B
I incorrect II correct
C
Both correct
D
Both incorrect
22
The funnel-shaped part of the fallopian tube closer to the ovary is the:
A
Isthmus
B
Ampulla
C
Infundibulum
D
Uterus
23
The inner cell mass contains certain cells called ______, which have the potency to give rise to all tissues and organs.
A
Germ cells
B
Stem cells
C
Trophoblast cells
D
Somatic cells
24
Which hormone causes strong uterine contractions during labor?
A
Estrogen
B
Progesterone
C
Oxytocin
D
Prolactin
25
During a single ejaculation, a human male ejaculates about:
A
1-2 million sperms
B
200-300 million sperms
C
500-800 million sperms
D
1 billion sperms
26
The site of fertilization in the human female is:
A
Uterus
B
Vagina
C
Ampullary region of fallopian tube
D
Cervix
27
Which of the following hormones are produced in women ONLY during pregnancy?
A
Estrogen and Progesterone
B
hCG, hPL and Relaxin
C
LH and FSH
D
Thyroxine and Cortisol
28
Odd one out:
A
Rete testis
B
Vasa efferentia
C
Epididymis
D
Seminiferous tubules
29
Read the following statements and find out the incorrect statement(s) :
(a) Humans are sexually reproducing and viviparous.
(b) Transfer of sperm in female genital tract (vagina) is called ejaculation.
(c) There are remarkable differences between the reproductive events in the male and in the female.
(d) Sperm formation continues even in old men, but formation of ovum ceases in women around the age of fifteen years.
(e) The male and female reproductive systems are located in the pelvic region.
A
(a), c and d
B
(b), c and e
C
b and d only
D
b only
30
Hormone acting on Sertoli cells:
A
LH
B
FSH
C
Estrogen
D
Progesterone
31
The release of sperms from the seminiferous tubules is called:
A
Spermiogenesis
B
Spermiation
C
Insemination
D
Ejaculation
32
Sertoli cells provide:
A
Protection to sperms
B
Nutrition to the germ cells
C
Motility to sperms
D
Formation of testosterone
33
Assertion: Testicular lobules present in testis Reason: They are involved in fertilisation
A
A true R false
B
A false R true
C
Both true correct
D
Both true wrong
34
Which of the following statement is false ?
A
Mammary gland differentiates during pregnancy and secrete milk after child birth.
B
The mammary glands are one of the female secondary sexual characteristics.
C
The leydig cells outside the seminiferous tubules, synthesise and secrete testicular hormones (androgens).
D
The cyclical changes in the ovary and the uterus during menstrual cycle are induced by changes in the levels of pituitary hormones only.
35
Female external genitalia include:
A
Ovary
B
Mammary gland
C
Mons pubis, clitoris, labia majora
D
All
36
Leydig cells (interstitial cells) secrete:
A
Estrogen
B
Progesterone
C
Androgens (Testosterone)
D
Cortisol
37
Ovary size:
A
2–6 cm
B
2–4 cm
C
3–6 cm
D
4–8 cm
38
The layer of the uterus that undergoes cyclical changes during the menstrual cycle is:
A
Perimetrium
B
Myometrium
C
Endometrium
D
Mesometrium
39
During embryonic stage, blood is derived from:
A
Ectoderm
B
Endoderm
C
Mesoderm
D
Trophoblast
40
In spermatogenesis, the first meiotic division leads to the formation of:
A
Secondary spermatocytes
B
Spermatogonia
C
Spermatids
D
Primary spermatocytes
41
Nourishing cells in seminiferous tubules:
A
Follicular
B
Leydig
C
Sertoli
D
Spermatogonia
42
During pregnancy, which hormone level is NOT increased?
A
Progesterone
B
Thyroxine
C
Prolactin
D
Luteinizing hormone
43
Select the incorrect statement:
A
Foetal and maternal blood are mixed in placenta and support the gaseous exchange
B
Umbilical cord has 50% maternal and 50% foetal blood
C
Umbilical cord contain 100% foetal blood
D
More than one option is incorrect
44
After ovulation, the remaining parts of the Graafian follicle transform into:
A
Corpus albicans
B
Corpus luteum
C
Primary follicle
D
Antrum
45
By the end of the second month of pregnancy, the fetus develops:
A
Heart
B
Limbs and digits
C
Most of the major organ systems
D
Fine hair and eyelashes
46
Which duct NOT involved in sperm transport?
A
Rete testis
B
Vasa efferentia
C
Oviduct
D
Epididymis
47
Which of the following statements is true? (a) Hymen is a reliable indicator of virginity (b) Milk is stored in alveoli (c) Clitoris is the counterpart of penis (d) The release of ovum is called oogenesis
A
b & c are true
B
a & b are true
C
a & d are true
D
Only a is true
48
Hymen:
A
Protects ovary
B
Covers vaginal opening partially
C
Supports uterus
D
Endometrium growth
49
Which statements are incorrect? I. Testis has 150 compartments II. Each lobule has 3–5 tubules III. Hymen is indicator of virginity IV. Female accessory ducts include uterus, oviduct, vagina
A
I, II and III
B
II and V
C
I, II, IV and V
D
II and III
50
The enlarged end of penis is:
A
Hymen
B
Glans penis
C
Foreskin
D
Epididymis
51
Progesterone is essential for:
A
Ovulation
B
Maintenance of the endometrium
C
Maturation of follicles
D
Formation of sperms
52
Urinogenital duct receives :-
A
Sperms
B
Urine
C
Faecal matter
D
Both (1) and (2)
53
The female external genitalia (vulva) includes all except:
A
Mons pubis
B
Labia majora
C
Hymen
D
Vagina
54
Which statement is true for menstruation cycle in human females?
A
Its absence is a clear indication of pregnancy
B
Concentration of progesterone attains its maximum around the middle of cycle
C
Menstruation blood can easily get clotted
D
High level of LH leads to ovulation
55
Observe the diagram of the male reproductive system. Which of the following labelled parts represents seminal vesicles? 
A
A
B
B
C
C
D
D
56
Which of the following statements are correct-
(a) The Menstrual flow results due to breakdown of endometrial lining of the ovary.
(b) The menstrual phase is followed by the secretory phase.
(c) The corpus luteum secretes large amount of progesterone which is essential for the maintenance of the endometrium.
(d) During Proliferative phase, the primary follicles in the ovary grow to become fully matured graafian follicle.
A
(a) and (b)
B
(c) and (d)
C
(b), (c) and (d)
D
(a), (b), (c) and (d)
57
Statement-I : The mitotic division as the zygote moves through the infundibulum of the oviduct.
Statement-II : Cleavage of zygote forms daughter cells blastomeres.
A
Both statement I and statement II are correct
B
Statement I is correct but statement II is incorrect
C
Statement I is incorrect but statement II is correct
D
Both statement I and statement II are incorrect
58
In humans, after one month of pregnancy, the embryo's ______ is formed.
A
Heart
B
Limbs
C
External genital organs
D
Brain
59
Select the correct option given below.
Statement I : At puberty only 60,000 - 80,000 primary follicles are left in both ovaries.
Statement II : Secondary follicle is characterised by a filled cavity called antrum.
A
Both Statement I and II are correct
B
Both Statement I and II are incorrect
C
Only statement I is correct
D
Only statement II is incorrect
60
Testis size:
A
4–5 cm length, 2–3 cm width
B
10–12 cm
C
14–15 cm
D
2–3 cm length, 4–5 cm width
61
Human male ejaculates:
A
100–150 million
B
400–450 million
C
200–300 million
D
500–600 million
62
For the process of spermatogenesis, the temperature of the testes should be:
A
25-30°C
B
33-35°C
C
37°C
D
40°C
63
Assertion (A) : Each ovary is covered by a thin epithelium which encloses the ovarian stroma.
Reason (R) : The epithelium of ovary is made up of germ cells.
Choose the correct answer from the given options:
A
Both (A) and (R) are true and (R) is the correct explanation of (A)
B
Both (A) and (R) are true and (R) is not the correct explanation of (A)
C
Both (A) and (R) are false.
D
(A) is true but (R) is false.
64
Which hormone surge triggers ovulation?
A
FSH
B
Estrogen
C
LH
D
Progesterone
65
The secretion of which layer of the ovum is changed by the sperm to prevent polyspermy?
A
Corona radiata
B
Zona pellucida
C
Plasma membrane
D
Chorion
66
The correct path of sperm transport in the male reproductive system is:
A
Rete testis → Seminiferous tubules → Vasa efferentia → Epididymis
B
Seminiferous tubules → Rete testis → Vasa efferentia → Epididymis
C
Epididymis → Vasa efferentia → Rete testis → Seminiferous tubules
D
Vasa efferentia → Rete testis → Seminiferous tubules → Epididymis
67
A primary oocyte surrounded by a layer of granulosa cells is called:
A
Secondary follicle
B
Tertiary follicle
C
Primary follicle
D
Graafian follicle
68
Statements incorrect: I: Accessory ducts controlled by pancreatic hormones II: Prostate is paired gland
A
I correct II incorrect
B
I incorrect II correct
C
Both correct
D
Both incorrect
69
The first meiotic division of the primary oocyte is completed within the:
A
Primary follicle
B
Secondary follicle
C
Tertiary follicle
D
Corpus luteum
70
Ampulla connects to:
A
Lactiferous duct
B
Mammary tubule
C
Seminiferous tubule
D
Cervical canal
71
A 30-year-old woman has a prolonged luteal phase with two months of missed periods, but is not pregnant. Which of the following hormonal abnormality likely causes the corpus luteum to persist?
A
Deficient secretion of Progesterone
B
Continuous hypersecretion of LH
C
An abrupt preovulatory surge of FSH.
D
A complete absence of circulating estrogen.
72
Each testis has how many testicular lobules :-
A
About 100
B
About 150
C
About 250
D
Infinite
73
Which structure connects seminiferous tubules to epididymis?
A
Vas deferens
B
Rete testis and vasa efferentia
C
Ejaculatory duct
D
Urethra
74
The number of testicular lobules in each testis is about:
A
100
B
250
C
500
D
1000
75
Which does not have 2n ploidy?
A
Spermatogonium
B
Sertoli cells
C
Primary spermatocyte
D
Spermatids
76
Birth canal formed by:
A
Uterus + cervix
B
Cervix + vagina
C
Ovary + uterus
D
Vagina only
77
GnRH is:
A
Hypothalamic hormone
B
Testicular hormone
C
Pituitary hormone
D
Ovarian hormone
78
Chromosomes in secondary spermatocyte (2n=16):
A
16
B
24
C
32
D
8
79
Phase of menstrual cycle in human that lasts for 7-8 days is
A
Follicular phase
B
Ovulatory phase
C
Luteal phase
D
Menstruation
80
Perimetrium is:
A
Skeletal layer
B
Membranous layer
C
Ciliated layer
D
Ligament
81
The function of ovary is/are:
A
To produce female gamete
B
To produce steroid hormones
C
To provide site for fertilisation
D
Both A and B
82
Copulatory organ in males:
A
Penis
B
Urethra
C
Epididymis
D
Vas deferens
83
The structure that connects the fetus to the placenta for transport of nutrients and oxygen is:
A
Chorionic villi
B
Umbilical cord
C
Yolk sac
D
Amnion
84
There are some events associated with reproduction and embryonic development. Arrange these from first to last and select the correct answer.
(a) Start formation of corpus luteum
(b) Cleavage
(c) Fertilisation
(d) Ovulation
(e) Implantation
(f) Formation of Graafian follicle
(g) Blastocyst
(h) Morula
(i) Zygote
A
f, d, c,a
B
f, d, i, c
C
a, f, d, c
D
i, h, g, f
85
Spermiogenesis is:
A
Spermatogonia → spermatids
B
Spermatids → spermatozoa
C
Spermatocytes → sperms
D
Activation of sperms
86
The process of fusion of a sperm with an ovum is called:
A
Insemination
B
Ovulation
C
Fertilization
D
Implantation
87
The yellowish milk produced during the initial days of lactation is called:
A
Callosum
B
Colostrum
C
Collagen
D
Pitocin
88
Which of the following structures is the first to appear as a result of the differentiation of the inner cell mass immediately after implantation?
A
Ectoderm and endoderm
B
Mesoderm and blastocyst
C
Endoderm and placenta
D
Trophoblast
89
The structural and functional units of the testis where sperms are produced are:
A
Seminal vesicles
B
Seminiferous tubules
C
Rete testis
D
Vasa efferentia
90
Assertion: Penis has erectile tissue Reason: Helps insemination
A
A true R false
B
A false R true
C
Both true correct
D
Both true wrong
91
Oogenesis is initiated during:
A
Puberty
B
Embryonic development stage
C
Birth
D
Menopause
92
The male accessory glands include:
A
Seminal vesicles, Prostate, and Bulbourethral glands
B
Epididymis, Vas deferens, and Rete testis
C
Pituitary, Thyroid, and Adrenal
D
Testis and Scrotum
93
Implantation occurs when the ______ attaches to the endometrium.
A
Morula
B
Zygote
C
Blastocyst
D
Gastrula
94
Select the correct sequence of events:
A
Gametogenesis → Insemination → Fertilization → Implantation → Embryogenesis → Parturition
B
Insemination → Gametogenesis → Fertilization → Implantation → Embryogenesis → Parturition
C
Gametogenesis → Embryogenesis → Insemination → Implantation → Fertilization → Parturition
D
Gametogenesis → Implantation → Insemination → Fertilization → Embryogenesis → Parturition
95
In males, LH (Luteinizing Hormone) acts on:
A
Sertoli cells
B
Leydig cells
C
Spermatids
D
Spermatogonia
96
In the given list how many male accessory ducts are present outside testes?
Rete testis, seminiferous tubule, epididymis, vas deferens, prostate, bulbourethral gland, seminal vesicle.
A
2
B
3
C
4
D
5
97
Spermatogenesis starts due to:
A
Testis formation
B
GnRH increase
C
Posterior pituitary
D
Sertoli nutrition
98
How many spermatozoa are produced from 100 secondary spermatocytes?
A
400
B
300
C
200
D
100
99
Not paired structure:
A
Uterus
B
Cervix
C
Vagina
D
All of these
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