CBSE Questions for Class 12 Medical Biology Human Reproduction Quiz 15 - MCQExams.com

Choose the correct answers from the alternatives given.
Place the following in the correct order concerning the passage of sperm from the testes to the outside of the body
ductus (vas) deferens, rete testes, seminiferous tubules, Epididymis, Urethra, straight tubules
  • 3,4,6,2,1,5
  • 2,4,6,1,3,5
  • 3,6,2,4,1,5
  • 3,6,2,4,5,1
State whether the following statements are true or false .
Oestrus prepares the female reproductive tract for copulation, whereas the menstrual cycle involves an elaborate preparation of the endometrium for implantation of a fertilized egg.
  • True
  • False
During Cleavage there is decrease
  • Size of blastomers
  • Number of blastomers
  • DNA content
  • Nucleocytoplasmic ratio
Statement $$1$$: Zygote is the vital link between two generations.
Statement $$2$$: Zygote is formed due to fusion of two haploid gametes.
  • Both statements $$1$$ and $$2$$ are correct
  • Statement $$1$$ is correct but statement $$2$$ is incorrect
  • Statement $$1$$ is incorrect but statement $$2$$ is correct
  • Both statements $$1$$ and $$2$$ are incorrect
The difference between spermiogenesis and spermiation is 
  • In spermiogenesis spermatoza from sertoli cells are released in the cavity of seminiferous tubules , while in spermiation spermatozoa are formed.
  • In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
  • In spermiogenesis spermatozoa are formed , while in spermiation spermatozoa are released from sertoli cells in to the cavity of seminiferous tubules.
  • In spermiogenesis spermatozoa are formed , while in spermiation spermatids are formed.
Refer to the given graph representing interplay of different hormones (A-D) during menstrual cycle in women and answer the questions that follow.
Which hormones are excreted in urine after menopause?

928459_6a29462f8854400b825bc5c5c4f7106b.JPG
  • A
  • B
  • C
  • Both (B) and (C)
Refer to the given graph representing interplay of different hormones (A-D) during menstrual cycle in women and answer the questions that follow.
Which hormone (A, B, C or D) is necessary for the final follicular growth and ovulation?

928456_eff4143d48374ba8825f9fb3bddbe7a7.JPG
  • A
  • B
  • C
  • D
Which of these combinations is most likely to be present before ovulation occurs ?
  • FSH, corpus luteum, estrogen, secretory uterine lining
  • LH, corpus luteum, progesterone, secretory uterine lining
  • FSH, follicle, estrogen, uterine lining becoming thick
  • Luteinising hormone (LH), follicle, progesterone, thick uterine lining
Though the total number of follicles in the ovaries of a normal young woman is about 4,00,00. The duration between menarche and menopause is limited. This is attributed to the
  • Follicular atresia
  • Liquor folliculi
  • Follicular proliferation
  • Follicular plasticity
Refer to the given graph representing interplay of different hormones (A-D) during menstrual cycle in women and answer the questions that follow.
Which hormone is most effective in producing uterine changes during menstrual cycle?
928460_9fea320dd2954b929c8baf24740c17c4.JPG
  • A
  • B
  • C
  • D
Mature Graafian follicle is generally present in the ovary of a healthy human female around
  • 5-8 day of menstrual cycle
  • 11-17 day of menstrual cycle
  • 18-23 day of menstrual cycle
  • 24-28 day of menstrual cycle.
Refer to the given graph representing interplay of different hormones (A-D) during menstrual cycle in women and answer the questions that follow.
Cessation of secretion of which of these hormones may lead to osteoporosis?

928457_c528f7bd57e841b49ef103e816f5e612.JPG
  • A
  • B
  • C
  • D
The principal tail piece of human sperm shows the microtubular arrangement of __________.
  • 7 + 2
  • 9 + 2
  • 11 + 2
  • 13 + 2
Androgens influence male libido by acting on
  • Testes
  • Penis
  • CNS
  • ANS
Epididymis and ejaculatory duct is connected by
  •  Vas deferens
  • Testis
  • Gubernaculum
  • None of the above
Write in sequence

a) Implantation    b) Blastomeres
c) Zygote             d) Morula
e) Cleavage         f) Blastocyst
  • c - a - b - d - e - f
  • c - e - b - d - f - a
  • c - a - e - d - b - f
  • b - e - f - d - a - c
Half of spermatozoa are without allosomes in
  • Insects of Hemiptera and orthoptera
  • Human beings
  • Drosophila
  • All of the above
In a twenty year old unmarried female who has never conceived and whose age of attainment of puberty was at twelve years. Approximately how many ovum would have been formed till date-
  • $$48-60$$
  • $$96-100$$
  • $$192-200$$
  • None of these
The membranous cover of follicular cells around the ovum of ovulation is
  • Corona radiata
  • Zona radiata
  • Zona pellucida
  • Chorion
Receptor of LH present in
  • Theca externa cells
  • Theca interna cells
  • Corona radiata cells
  • Zona pellucida
The key events in embryo development are given below which is the correct order of seequences 
i) organogenesis    ii) Fertilization    iii) Gastrulation   iv) Neurulation   v) Cleavage
  • v $$\rightarrow$$ ii $$\rightarrow$$ iv $$\rightarrow$$ i $$\rightarrow$$ iii
  • ii $$\rightarrow$$ iii $$\rightarrow$$ v $$\rightarrow$$ i $$\rightarrow$$ iv
  • iii $$\rightarrow$$ iv $$\rightarrow$$ ii $$\rightarrow$$ i $$\rightarrow$$ v
  • ii $$\rightarrow$$ v $$\rightarrow$$ iii $$\rightarrow$$ i $$\rightarrow$$ iv

Identify the correct match of column $$I, II$$ and $$III$$.


Column - $$I$$

 

Column -$$II$$

 

Column - $$III$$

sertoli cells

a

LH

i

spermatogenesis

leydig's cells

b

inhibin

ii

formation of the ovarian follicle

anterior pituitary

c

testosterone

iii

suppress FSH

ovary

d

estrogen

iv

ovulation
  • $$A=b-iii, B= a-iii, C= c-I, D= d-iv$$
  • $$A= b-iii, B= c-I, C= a=iv, D= d-ii$$
  • $$A= c-ii, B= b-iii, C= a-I, D= d-iv$$
  • $$B= a-iv, A= d-I, C=b-iii, D= c-ii$$
How the FSH controls the spermatogenesis?
  • By releasing testosterone
  • By activation of spermatogonia
  • By promoting the Sertoli cells to release the ABP and inhibin
  • By promoting the Sertoli cells to release testosterone
Fructose is present in the secretion of?
  • Corpus spongiosum
  • Seminal vesicles
  • Urethra
  • Tyson's gland
Identify the incorrect character related to male human reproductive systems.
  • Seminiferous tubules of testis is open into rete testis.
  • Seminiferous tubules of testis open into vasa efferentia through rete testis
  • Epididymis leads to vasa efferentia which ascends to the abdomen.
  • Epididymis is located along the posterior surface of each testis.
Statement about gametogenesis?
  • Spermatogenesis begins at puberty whereas oogenesis begins during embryonic stages
  • Immature male germ cells are called spermatogonia
  • The diploid spermatogonia periodically undergo meiosis
  • Spermatogonia in seminiferous tubules increase in number by mitosis
Diploid zygote is formed by the fusion of male and female gamete. This process
  • Fertilization
  • Budding
  • Pollination
  • Spore
Vas deferens receives a duct from seminal vesicle and opens into urethra as ________.
  • Urethral meatus
  • Ejaculatory duct
  • Ureter
  • Epididymis
Spermatogenesis is induced by?
  • FSH
  • ICSH
  • STH
  • ATH
Which of the following statements regarding the sexual development of the foetus is correct?
  • In the absence of a Y chromosome the sexual development of a foetus will follow the male pattern
  • The development of the foetal gonads into the male type depends on the presence of oestrogen
  • The sex of an individual is determined by a set of genes on the X chromosome
  • The sex of an individual is determined by genes on the Y chromosome
What is the number of chromosomes in primary spermatocyte of human?
  • $$46$$
  • $$44$$
  • $$23$$
  • $$22$$
The sperms undergo physiological maturation, acquiring increased motility and fertilising capacity in?
  • Seminiferous tubules
  • Vasa efferentia
  • Epididymis
  • Vagina
Rewrite the terms in the correct order so as  to be in a logical sequence 
  • Implantation ovulation, child birth, gestation, fertilisation
  • coids, ovum, sperm, sperm duct, urethra, vagina
  • Sperm duct, pents, testes, sperms, semen
  • Puberty, menopause, menstruals, menarche
The following graph shows the levels of pituitary hormones during a menstrual cycle. What do 1 and 2 represent?
1392422_e079bf6b29414537857f2985fc2b64e5.PNG
  • 1-LH, 2-FSH
  • 1- Estrogen, 2-Progesterone
  • 1-FSH, 2-LH
  • 1-Progesterone, 2-Estrogen
The sperms undergo physiology maturation, acquiring increased motility and fertilising capacity in?
  • Seminiferous tubules
  • Vasa efferentia
  • Epididymis
  • Vagina
How many of the following statement about menstrual cycle are correct?
A. One ovum is released during start of menstrual cycle.
B. Graafian follicle transforms into corpus luteum.
C. Menstrual cycle ceases around $$50$$ years of age and termed as menopause.
D. LH and FSH decreases gradually during follicular phase.
  • Four
  • Two
  • Three
  • One
Which statement is incorrect regarding female external genitalia ?
  • Mons pubis is a cushion of fatty tissue covered by skin and pubic hairs
  • Clitoris lies at the upper junction of labia minora below the urethral opening
  • Hymen is not a reliable indicator of virginity
  • Labia majora are fleshy folds of tissue
Spermatogenesis is a process in which 
  • Spermatids change into spermatozoa
  • Spermatogonia produce a spermatid
  • Spermatocytes give rise to spermatozoa
  • Dormant spermatozoa become active fore ejacuation
Choose the correct option from the following based on the diagram
1630550_19265070ea4a4ddb884ce89f7840d176.PNG
  • (a) Spermathecae (e) ovary (f) ovarian funnel (j) prostate gland
  • (a) testis sac (h) accessory glands (g) ovarian funnel, (i) prostate gland
  • (h) Spermathecae (a) ovary (j) ovarian funnel (c) accessory glands
  • (h) testis sac (a) accessory glands (i) ovarian funnel, (g) prostate gland
Semen contains fluid from many parts of the secretory tract, is alkaline to help neutralize the acidic vagina, contains about $$20\%$$ morphologically abnormal sperm, and about $$25\%$$ immotile sperm. Which of the following describes semen that contains sperm with poor motility?
  • Azoospermia
  • Oligospermia
  • Asthenozoospermia
  • Teratozoospermia
Which of following structure is not the content of spermatic cord?
  • Vas-deferens
  • Testicular vessels
  • Testicular nerve
  • Deep artery of corpus cavernosa
Which statement is suitable for luteal phase of menstrual cycle ?
  • Endometrium regenerates through proliferation
  • Endometrium becomes more vascular and glandular
  • Follicular development occurs
  • Endometrium is devoid of glycogen deposits
In female if the ovum does not get fertilized then menstruation occurs. The unfertilised ovum along with thick wall of uterus comes out of uterus through vagina Normally when the female reaches the age about 40-45 years, menstruation stops permanently. This is known a menopause and in this stage woman lose the capacity of carrying embryo. Which of the following is true for the occurrence of this condition?
(P) Bones become porous and thus cannot support the embryo
(Q) Alter the menopause ovum does not permit the sperms to reach it.
(R) After menopause ova are not released from the ovary.
  • Only P
  • Only Q
  • Only R
  • Only P and Q
Match the following columns and select the correct option -
Column-1Column-II
(a) Placenta(i) Androgens
(b) Zona pellucida(ii) Human Chorionic Gonadotropin (hCG)
(c) Bulbo-urethral glands(iii) Layer of the ovum
(d) Leydig cells(iv) Lubrication of the penis
  • (a) - (i), (b) - (iv), (c) - (ii), (d) - (iii)
  • (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)
  • (a) - (II), (b) - (iii), (c) - (iv), (d) - (i)
  • (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
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