CBSE Class 12 Biology Reproduction In Human Beings Worksheet Set D

Question: Which of the following produces sperms in spermatogenesis?
a) Primary spermatocytes
b) Sertoli cells
c) Immature male germ cells
d) Interstitial cells
Answer: c

Question: Which of the following hormone maintains the function of male sex accessory gland and ducts?
a) Progesterone
b) Androgen
c) Estrogen
d) Luteinizing hormone
Answer: b

Question: Menstruation is triggered by a sudden decline in the amount of hormone secreted by corpus luteum. Identify the hormone.
a) Estrogen
b) Follicle stimulating hormone
c) Luteinizing hormone
d) Progesterone
Answer: d

Question: Spermatids are transformed into sperm by a process called _______.
a) Spermiation
b) Spermiogenesis
c) Implantation
d) Insemination
Answer: b

Question: Which phase of menstrual cycle is also called proliferative phase?
a) Menstruation
b) Ovulatory
c) Follicular
d) Luteal
Answer: c

Question: Which of the following indicates pregnancy?
a) Occurrence of menstrual flow
b) Lack of menstruation
c) When released ovum is not fertilized
d) When Graafian follicle matures and endometrium regenerates
Answer: b

Question: By which process sperms are released from the seminiferous tubules?
a) Spermatogenesis
b) Spermiation
c) Spermiogenesis
d) Insemination
Answer: b

Question: At the time of implantation, the human embryo is called ______.
a) Embryo
b) Zygote
c) Foetus
d) Blastocyst
Answer: d

Question: Which of the following differentiate into embryo?
a) Zygote
b) Morula
c) Inner cell mass
d) Trophoblast
Answer: c

Question: The embryo with 8 to 16 blastomeres is called ________.
a) Morula
b) Blastocyst
c) Placenta
d) Zygote
Answer: a

Question: Which layer of blastocyst gets attached to the endometrium?
a) Inner cell mass
b) Umbilical cord
c) Trophoblast
d) Both inner cell mass and umbilical cord
Answer: c

Question: Which of the following hormones is produced in women only during pregnancy?
a) Estrogen
b) Progesterone
c) Oxytocin
d) Relaxin
Answer: d

Question: Placenta acts as an
a) Corpus luteum
b) Endocrine tissue
c) Embryo
d) Exocrine gland
Answer: b

Question: Which of the following hormone acts on uterine muscle and causes its stronger contraction?
a) Progesterone
b) Relaxin
c) Estrogen
d) Oxytocin
Answer: d

Question: Secretion of milk from the mammary gland towards the end of the pregnancy is called _____.
a) Fertilization
b) Implantation
c) Lactation
d) Parturition
Answer: c

Question: Increased secretion of which hormone starts the process of sperm formation at the time of puberty?
a) TSH
b) GH
c) GnRH
d) PRL
Answer: c

Question: Ejaculation of human male contains about 200–300 million sperms, of which for normal fertility ____% sperms must have normal shape and size and at least ____% must show energetic motility.
a) 50, 50
b) 40, 60
c) 30, 70
d) 60, 40
Answer: d

Question: A sac shaped like an upside down pear with thick lining and muscles in the pelvic area where a fertilized egg grows is called _____.
a) Vagina
b) Uterus
c) Vulva
d) Oviduct
Answer: b

Question: Which of the following is a transporting tube leading from the bladder that brings urine outside the body via penis?
a) Ejaculatory duct
b) Epididymis
c) Urethral meatus
d) Ureter
Answer: c

Question: The ______ lead to vas deferens that ascends to the ______ and loops over the ______.
a) Epididymis, abdomen, urinary bladder
b) Vas efferentia, abdomen, ureter
c) Prostate, stomach, urinary bladder
d) Urinary bladder, ejaculatory duct, abdomen
Answer: a

Question: Which gland releases a small amount of fluid just prior to ejaculation to decrease acidity in the urethra caused by urine?
a) Seminal vesicle
b) Prostate
c) Bulbourethral gland
d) Glans penis
Answer: c

Question: The womb opens into vagina through _______.
a) Hymen
b) Cervix
c) Ampulla
d) Clitoris
Answer: b

Question: Which of the following induces foetal ejection reflex?
a) Transport of embryo in the fallopian tube
b) Initiation of lactation
c) Fully developed foetus and placenta
d) Expulsion of the baby out of the uterus
Answer: c

Question: Which of the following is not a paired structure in male?
a) Vas deferens
b) Epididymis
c) Ejaculatory duct
d) Urethra
Answer: d

Question: Which of the following process induces the completion of the meiotic division of secondary oocyte?
a) Implantation
b) Gametogenesis
c) Fertilization
d) Parturition
Answer: c

Question: Second meiotic division in secondary oocyte results in the formation of
a) First polar body and a diploid ovum
b) Second polar body and a diploid ovum
c) First polar body and a haploid ovum
d) Second polar body and a haploid ovum
Answer: d

Statement Type Questions

Question: Which of the following is true regarding the male reproductive system?
a) The scrotum keeps the testes warmer, thus helping sperm formation
b) Sperms are diploid
c) It includes testes, accessory ducts and glands, and oviducts
d) Sertoli cells are found in seminiferous tubules and provide nutrition to germ cells
Answer: d

Question: Which of the following statements regarding parturition is incorrect?
a) Prolactin induces uterine contraction
b) It is induced by neuroendocrine mechanism
c) Uterine contraction leads to expulsion of baby through the birth canal
d) Oxytocin plays an important role in the contraction of fallopian tube
Answer: a

Question: Which of the following statement is correct regarding menstruation?
a) The menstrual fluid can easily clot
b) The end of the cycle of menstruation is called menarche
c) At menopause there is abrupt decrease in gonadotropic hormones
d) In human female, menstruation can be deferred by administration of estrogen and progesterone
Answer: d

Question: The sperm and the egg make different contributions to zygote. Which of the following statements are true?
(i) Sperm contributes most of the mitochondria.
(ii) Egg contributes most of the cytoplasm.
(iii) Both sperm and egg contribute haploid nucleus.
(iv) Both sperm and egg contribute centrioles.
a) (i) and (ii)
b) (ii) and (iii)
c) (iii) and (iv)
d) All of these
Answer: b

Question: Which of the following statements regarding mammary gland is incorrect?
a) They are paired glandular structures lying over pectoral muscles
b) Each gland has 100–500 lobulated milk glands
c) Cells of alveoli secrete milk which is stored in alveolar cavity
d) Each milk gland has lactiferous ducts opening at the nipple
Answer: b

Question: Which of the following statement regarding female reproductive system is/are correct?
(i) Myometrium undergoes strong contraction at the time of delivery of baby.
(ii) Ovary is secondary female sex organ which produces female gamete and steroid hormones.
(iii) Ovarian stroma is divided into two zones: inner cortex and outer medulla.
(iv) Infundibulum possess finger like projections which help in collection of ovum after the release of secondary oocyte.
(v) A functional mammary gland is the characteristics of all the mammals (including male and female).
a) (i) and (iv)
b) (i), (ii), (iii) and (v)
c) (iii), (iv) and (v)
d) All the five statements
Answer: a

Assertion / Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question: Assertion : During fertilization only head of spermatozoa enters egg.
Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
Answer: c

Question: Assertion : Death is one of the important regulatory process on earth.
Reason : It avoids over-crowding caused by continuous reproduction.
Answer: a

Question: Assertion : Clitoris is not remnant of penis in females.
Reason : It also have high blood supply and erectile tissue.
Answer: c

Question: Assertion : Interstitial cell is present in the region outside the seminiferous tubule called interstitial spaces.
Reason : Interstitial cells provide nutrition to the sertoli cells.
Answer: c

Question: Assertion : Head of sperm consists of acrosome and mitochondria.
Reason : Acrosome contains spiral row of mitochondria.
Answer: c

Critical Thinking Type Questions

Question: Which of the following group of cells involved in spermatogenesis represent haploid cells?
a) Primary spermatocyte
b) Spermatogonium
c) Both (a) and (b)
d) Secondary spermatocyte
Answer: d

Question: Which of the following is not a uterine function?
a) Mechanical protection of the developing embryo
b) Place of fusion of male and female gametes
c) Nutritional support of the growing embryo
d) Waste removal for the developing embryo
Answer: b

Question: What will happen to pregnancy if placenta fails to function during the gestation?
a) The foetus would be born prematurely
b) The pregnancy would not continue
c) There would be no effect on the pregnancy
d) The corpus luteum would continue to produce hormone until birth
Answer: b

Question: At the time of fertilization, chromosome number
a) remains haploid
b) is halved
c) becomes diploid
d) does not change
Answer: c

Question: Which of the following does not occur during and immediately following fertilization?
a) Fusion of the sperm and ovum nuclei
b) Digestion of cell layers around the oocyte by sperm
c) Division of the oocyte cell by meiosis
d) Implantation of the ovum in the uterus
Answer: d

Question: Which of the following shows the correct sequence of events leading to the formation of mature sperm?
a) Spermatogonium → Secondary spermatocyte → Primary spermatocyte → Spermatids → Sperms
b) Spermatogonium → Primary spermatocyte → Secondary spermatocyte → Spermatids → Sperms
c) Spermatids → Primary spermatocyte → Secondary spermatocyte → Spermatogonium → Sperms
d) Spermatogonium → Spermatids → Secondary spermatocyte → Primary spermatocyte → Sperms
Answer: b

Question: Which of the following is the first change that occurs to the zygote after fertilization?
a) It initiates the formation of a placenta
b) It divides to form a hollow ball of cells called blastocyst
c) It contacts the endometrial wall and becomes buried inside it
d) It begins to secrete hormones
Answer: b

Question: Study the statement and identify P, Q, R and S.
“During ‘P’ phase of the menstrual cycle, if pregnancy doesn’t happen, the ‘Q’ withers and dies. The drop in ‘R’ levels causes the uterine lining to fall away. This is known as ‘S’.”
a) P–Menstrual, Q–Graafian follicle, R–Estrogen, S–Menarche
b) P–Luteal, Q–Corpus luteum, R–Progesterone, S–Menstruation
c) P–Ovulatory, Q–Endometrium, R–FSH, S–Menopause
d) P–Follicular, Q–Secondary oocyte, R–LH, S–Menstruation
Answer: b

Question: Select the correct sequence of menstrual cycle.
a) Follicular, Menstruation, Luteal, New cycle
b) Luteal, Menstruation, Follicular, New cycle
c) Menstruation, Follicular, Luteal, New cycle
d) Menstruation, Secretory, Follicular, New cycle
Answer: c

Question: Study the statement and identify X and Y.
“Vigorous contraction of the ‘X’ at the end of the ‘Y’ causes expulsion of the foetus.”
a) X–Vagina, Y–Fertilization
b) X–Uterus, Y–Pregnancy
c) X–Placenta, Y–Implantation
d) X–Embryo, Y–Ovulation
Answer: b

Question: What happens during fertilization in humans after many sperms reach close to the ovum?
a) All sperms except one lose their tails
b) Only the closest sperm penetrates zona pellucida
c) Secretions of acrosome help one sperm enter ovum through zona pellucida and plasma membrane
d) Corona radiata traps all sperms except one
Answer: c

Question: Select the option which shows the correct part of a sperm with its corresponding function.
a) Tail: Helps in fertilization using acrosomal enzymes
b) Head: Stimulates Leydig cells to produce androgen
c) Middle piece: Produces energy from mitochondria for tail movement
d) Neck: Essential for maturation and motility of sperm
Answer: c

Question: A gonadotropin hormone “X” acts on interstitial cells and stimulates synthesis and secretion of “Y”. Identify X and Y.
a) X–FSH, Y–Testosterone
b) X–LH, Y–Androgen
c) X–TSH, Y–Progesterone
d) X–GH, Y–Estrogen
Answer: b

Question: The feature of some structures of male reproductive system is given below. Identify the structure which surrounds the primary sex organ of male reproductive system.
a) Enlarged end is called glans penis
b) Travels through penis and carries semen and urine
c) Maintains low temperature (2–2.5°C below body temperature) for sperm maturation
d) Stores sperms prior to ejaculation
Answer: c

Matching Type Questions

Question: Which of the following pair is incorrectly matched?
(a) Leydig cells – Testosterone
(b) Spermatogenesis – Seminiferous tubules
(c) Male reproductive system – Pelvis region
(d) Spermatogonia – Mitotic division
Answer: d

Question: Match the column-I with column-II and select the correct option. Match from the options given below.

Column-I                                             Column-II
A. Primary oocyte                        I. It is formed when oogonia starts division and temporarily arrested at prophase of meiosis I.
B. Secondary oocyte                  II. A large haploid cell which retains bulk of nutrient rich cytoplasm of the primary oocyte.
C. Primary follicle                       III. A large number of these degenerate during the phase from puberty to birth.
D. Oogonia                                 IV. Gamete mother cell.
E. Secondary follicle                   V. Surrounded by more layers of granulosa cells and a new theca.
F. Graafian follicle                      VI. Rupture to release ovum from the ovary.

(a) A – I; B – II; C – III; D – IV; E – V; F – VI
(b) A – III; B – I; C – IV; D – II; E – V; F – VI
(c) A – VI; B – IV; C – V; D – II; E – I; F – III
(d) A – II; B – IV; C – III; D – V; E – I; F – VI
Answer: b

Question: In the given columns, column-I contain features of developing child and column-II contain the time of their occurrence. Select the correct match.

Column-I                                                                                                           Column-II
(Features of occurrence)                                                                   (Time of there developing child)

A. Heart sound                                                                                        I. By the end of the second month of pregnancy
B. Foetus develops limbs and digit                                                           II. During the fifth month
C. Formation of major organ system foetus                                             III. First sign of growing
D. First movement of foetus and appearance of hair on head                  IV. By the end of 12 weeks
E. Body covered with hair, eyelid separate, eyelashes are formed           V. By the end of 24 weeks

(a) A – I; B – II; C – III; D – IV; E – V
(b) A – III; B – I; C – IV; D – II; E – V
(c) A – II; B – I; C – III; D – V; E – IV
(d) A – III; B – IV; C – II; D – V; E – I
Answer: b

Question: Match the column-I with column-II and select the correct option.

Column-I                 Column-II
A. Fertilization         I. Mitotic division
B. Implantation       II. Embryo with 8 to 16 blastomeres
C. Cleavage           III. Ampullary-isthmic junction
D. Morula               IV. Structure formed by the continuous division of 8 to 16 blastomeres
E. Blastocysts         V. Embedding of blastocysts in the endometrium

(a) A – I; B – II; C – IV; D – V; E – III
(b) A – III; B – I; C – IV; D – II; E – V
(c) A – III; B – V; C – I; D – IV; E – II
(d) A – III; B – V; C – I; D – II; E – IV
Answer: d