12th Biology chapter 3: full solution, notes, MCQ, & free PDF | Bihar board

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12th Biology chapter 3 Bihar board with NCERT-Details & Highlights

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12th Biology chapter 3 all objective solutions – download PDF

Question 1. The pituitary hormone by which Sertoli cells are regulated is called

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    • (a) LH
      (b) FSH
      (c) GH
    • (d) prolactin.

Answer: (b) FSH

Question 2. If due to any reason the vasa efferenta of the human reproductive system is closed, then the gametes will not conduct from

    • (a) testis to epididymis
    • (b) vas deferens from epididymis
    • ( c) ovary to uterus
    • (d) vagina From Uterus.

Answer:(a) Epididymis from testis

Question 3. Seminal plasma in humans is rich in

    • (a) fructose and calcium, but does not contain enzymes.
      (b) Glucose and some enzymes, but no calcium.
      (c) Fructose and some enzymes, but low in calcium.
      (d) Contains fructose, calcium and some enzymes.

Answer: (d) Contains fructose, calcium and some enzymes.

Question 4. The function of secretion of prostate gland is

    • (a) to reduce the activity of sperm
    • (b) to attract sperm
    • (c) to stimulate sperm activation
    • (d) none of the above.

Answer: (c) By encouraging sperm activation

Question 5. The end of the epididymis which is at the top of the testis is called

    • (a) cauda epididymis
      (b) vas deferens
      (c) caput epididymis
      (d) gubernaculum.

Answer: (c) Caput epididymis

Question 6. The prostate glands are located under

    • (a) gubernaculum
      (b) seminal vesicles
      (c) epididymis
      (d) bulbourethral gland.

Answer: (b) Seminal vesicles

Question 7. The temperature of the scrotum, which is necessary for the functioning of the testis, is always about ……….. lower than the body temperature.

    • (a) 2°C
      (b) 4°C
      (c) 6°C
      (d) 8°C

Answer: (a) 2°C

Question 8. After ovulation, which part of the ovary of mammals acts as an endocrine gland?

    • (a) stroma
      (b) germinal epithelium
      (c) vitreous membrane
      (d) Grafian follicle

Answer: (d) Grafian follicle

Question 9. The lower narrow end of the uterus is called

    • (a) urethra
      (b) cervix
      (c) clitoris
      (d) vulva.

Answer: (b) Cervix

Question 10. A primary spermatocyte has 2n = 16, which is in the metaphase of the first meiosis. What is the total number of chromatids in each secondary spermatocyte?

    • (a) 16
      (b) 24
      (c) 32
      (d) 8

Answer: (a) 16

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Question 11. At the end of the first meiotic division in humans, male germ cells will differentiate into

    • (a) spermatids
      (b) spermatogonia
      (c) primary spermatocytes
      (d) secondary spermatocytes.

Answer: (d) Secondary spermatocytes.

Question 12. The principal tail piece of human sperm shows the following type of microtubular arrangement

    • (a) 7+2
      (b) 9+2
      (c) 11+2
      (d) 13+2

Answer: (d) 13+2

Question 13. In spermatogenesis, the reductionist division of chromosomes occurs during the transformation of

    • (a) spermatogonia to primary spermatocytes
      (b) primary spermatocytes to secondary spermatocytes
      (c) secondary spermatocytes to spermatids
      (d) spermatids to spermatids.

Answer: (b) Primary spermatocytes to secondary spermatocytes

Question 14. During physiological maturation of sperm, its motility and capacity for fertilization increases here

    • (a) Seminiferous tubules
      (b) Vasa efferenta
      (c) Epididymis
      (d) Vagina

Answer: (b) Vasa efferencia

Question 15. Which of the following is released from the ovary?

    • (a) Primary oocyte
      (b) Secondary oocyte
      (c) Grafian follicles
      (d) Ugonian

Answer: (c) Grafian follicles

Question 16. At which stage of life does oogenesis start in a human female?

    • (a) puberty
      (b) during menarche
      (c) during menopause
      (d) during embryonic development

Answer: (d) during embryonic development

Question 17. After ovulation the graphene follicle gets converted into

    • (a) corpus atresia
    • (b) corpus callosum
    • ( c) corpus luteum
    • (d) corpus albicans.

Answer: (c) Corpus Luteum

Question 18. By Sertoli cells in the cavity of the seminiferous tubules. The method of release of spermatozoa is called

    • (a) spermiogenesis
      (b) spermatogenesis
      (c) spermatocytogenesis
      (d) spermatogenesis.

Answer: (d) Spermation.

Question 19. The tract part of sperm contains

    • (a) proteins
      (b) mitochondria
      (c) centriole
      (d) nucleus.

Answer: (b) Mitochondria

Question 20. Immediately after ovulation, the Mammalian egg is covered with a membrane called

    • (a) chorion
      (b) zona pellucida
      (c) corona radiata
      (d) vitreous membrane.

Answer: (a) chorion

Question 21. Corpus luteum develops from

    • (a) Grafian follicle
    • (b) Nephrostome
    • ( c) Oocytes
    • (d) None of the above.

Answer: (a) Graphian follicle

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Question 22. Spermatogenesis is induced by

    • (a) FSH
      (b) ICSH
      (c) STH
      (d) ATH

Answer: (a) FSH

Question 23. Secondary maturation takes place in oocyte

    • (a) ovary
      (b) abdominal cavity
      (c) fallopian tube
      (d) uterus.

Answer: (c) Fallopian tube

Question 24. In which stage of oogenesis the first polar body is formed?

    • (a) 1st meiosis
      (b) 2nd mitosis
      (c) 1st mitosis
      (d) differentiation

Answer: (a) 1st meiosis

Question 25. In spermatogenesis, the maturation stage occurs in

    • (a) growth of spermatogonia into primary spermatocytes
      (b) formation of spermatogonia from gonocytes by mitosis
      (c) formation of spermatids from primary spermatocytes by meiosis
      (d) oogonia from spermatocytes by meiosis To become

Answer: (c) Formation of spermatids from primary spermatocytes by meiosis

Question 26. Which of the following group of cells of male gonads represents haploid cells?

    • (a) Spermatogonial cells
      (b) Germinal epithelial cells
      (c) Secondary spermatocytes
      (d) Primary spermatocytes

Answer: (c) Secondary spermatocytes

Question 27. At which stage does the haploid egg get fertilized by the sperm in oogenesis?

    • (a) Primary oocyte
      (b) Secondary oocyte
      (c) Ugonium
      (d) Ovum

Answer: (b) Secondary oocyte

Question 28. In a simple menstrual cycle, which one of the following events is correctly matched with the time period?

    • (a) Release of egg : 5th day
    • (b) Regeneration of endometrium : 5-10 days
    • (c) Endometrium carries nutrients for implantation : 11-18 days
    • (d) Rise of progesterone level : 1-15 Days

Answer: (b) Regeneration of Endometrium : 5-10 days

Question 29. Name the hormone which has no role in the secretion of seasons?

    • (a) LH
      (b) FSH
      (c) Estradiol
      (d) TSH

Answer: (d) TSH

Question 30. The time of maximum chance of conception for a woman from the day of the onset of menstruation is ………….

    • (a) 1st day
      (b) 4th day
      (c) 14th day
      (d) 26th day

Answer: (c) 14th day

Question 31. In the 28 day ovarian cycle of a human, ovulation occurs on

    • (a) day 1 of the cycle
    • (b) day 14 of the cycle
    • (c) day 5 of the cycle
    • (d) day 28 of the cycle.

Answer: (b) 14th day of the cycle

Question 32. Ovulation normally occurs in the male female during the menstrual cycle

    • (a) in the mid-secretory phase
    • (b) immediately before the end of the secretory phase
    • (c) at the beginning of the proliferative phase
    • (d) proliferative phase At the end of

Answer: (d) At the end of the proliferative phase.

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Question 33. The phase of the menstrual cycle which lasts for 7-8 days is

    • (a) Follicular phase
      (b) Ovulatory phase
      (c) Luteal phase
      (d ) Menstrual phase

Answer: (a) Follicular phase

Question 34. Endometrium is repaired by

    • (a) LH
      (b) FSH
      (c) estrogen
      (d) prolactin.

Answer: (c) Estrogen

Question 35. A human female reaches the stage of menopause around this age of

    • (a) 50 years
      (b) 15 years
      (c) 70 years
      (d) 25 years.

Answer: (a) 50 years

Question 36. Which of the following is wrong for a human female?

    • (a) The menstrual cycle is of about 28 days.
      (b) Menopause occurs at the age of 45-55 years.
      (c) The eggs released during pregnancy die.
      (d) Menstruation lasts for about 4 days.

Answer: (c) Eggs released during pregnancy die.

Question 37. Its excretion in urine increases at menopause

    • (a) FSH
      (b) STH
      (c) MSH
      (d) None of the above.

Answer: (a) FSH

Question 38. Oxytocin

    • (a) stimulates the pituitary to secrete vasopressin in adult females of humans .
      (b) Produces powerful uterine contractions at the time of delivery.
      (c) Secreted by the anterior pituitary.
      (d) stimulates the growth of mammary glands.

Answer: (d) Encourages the growth of mammary glands.

Question 39. What is the use of sperms to increase their motility and fertilization capacity? Physiological maturation takes place with

    • (a) seminiferous tubules
      (b) vasa efferenta
      (c) epididymis
      (d) vagina.

Answer: (c) Epididymis

Question 40. An action of the granulous substance which makes the zona pellucida rigid and ensures closure of polyspermy is

    • (a) acrosomal action
      (b) cortical action
      (c) acrocin action
      (d) bindin action.

Answer: (b) Cortical verb

Question 41. The preparation of sperm before penetrating the ovum is

    • (a) spermiation
      (b) cortical action
      (c) spermiogenesis
      (d) capacitation.

Answer: (d) Capacitation.

Question 42. Successfully forming a solid group of 8-16 cells from the zygote after mitotic division is called

    • (a) Blastula
    • ( b) Gestula
    •  (c) Morula
    • (d) None of the above.

Answer: (c) Morula

Question 43. Cleavage is different from mitosis because it does not have

    • (a) synthetic phase
      (b) growth phase
      (c) (a) and (b) both
      (d) none of the above.

Answer: (b) Growth phase

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Question 44. Which part of the sperm plays an important role in penetrating the egg membrane?

    • (a) allosome
      (b) tail
      (c) autosome
      (d) acrosome

Answer: (d) acrosome

Question 45. Apart from making the egg functional, another role of sperm is to carry

    • (a) RNA
      (b) mitochondria
      (c) DNA
      (d) ribosomes

Answer: (c) DNA

Question 46. During which month of pregnancy does the first movement of the feet and the hair on its head appear?

    • (a) in the fourth month
      (b) in the fifth month
      (c) in the sixth month
      (d) in the third month

Answer: (b) in the fifth month

Question 47. Fetus gets nutrition and oxygen from

    • (a) Elantois
      (b) Placenta
      (c) Yolk sac
    • (d) Corion.

Answer: (b) The placenta

Question 48. Gestula is the embryonic stage in which

    • (a) cleavage takes place.
      (b) Blastocele is formed.
      (c) Germinal layers are formed.
      (d) Solutes are formed.

Answer: (c) Germinal layers are formed.

Question 49. Urine test during pregnancy detects the presence of

    • (a) Human Chorionic Gonadotropin Hormone
      (b) Estrogen
      (c) Progesterone
      (d) Luteinizing Hormone.

Answer: (a) Human chorionic gonadotropin hormone

Question 50. Distinctly in the early stages of human embryo are

    • (a) Gills
      (b) Gill holes
      (c) External ear (pinna)
      (d) Eyebrows.

Answer: (b) Gill hole

Question 51. In the development of human body, ectoderm is responsible for making

    • (a) ovary
      (b) nervous system
      (c) sweat glands
      (d) all of the above.

Answer: (d) All of the above.

Question 52. Vertical column is derived from

    • (a) ectoderm
      (b) nerve cord
      (c) endoderm
      (d) notochord.

Answer: (b) nerve cord

Question 53. The structure that connects the fetus to the placenta is

    • (a) umbilical cord
      (b) amnion
      (c) yolk sac
      (d) Korean.

Ans: (a) Umbilical cord

Question 54. In the incidence of pregnancy, the corpus luteum is maintained by

    • (a) LH
      (b) FSH
      (c) chorionic gonadotropin
      (d) progesterone.

Answer: (c) Chorionic Gonadotropin

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Question 55. Which of the following happens first during embryonic development?

    • (a) Differentiation of organs
      (b) Differentiation of tissues
      (c) Differentiation of organ systems
      (d) Differentiation of cells

Answer: (d) Differentiation of cells

Question 56. After birth, colostrum is released from the mammary glands, it contains

    • (a) small amount of fat and proteins
      (b) proteins and small amount of fat
      (c) proteins and antibodies and less fat
      (d) proteins and Low amounts of fats and antibodies.

Answer: (c) Proteins and antibodies and less fat

Question 57. Choose the mismatch from the following structures of the male reproductive system.

    • (a) Rete testis
      (b) Epididymis
      (c) Vasa efferenta
      (d) Isthmus

Answer: (d) Isthmus

Question 58. Mature Graphian follicles are normally present in the ova of a healthy female at

    • (a) 5-8 days of the menstrual cycle
      (b) 11-17 days of the menstrual cycle
      (c) 18-23 of the menstrual cycle In days
      (d) in days 24-28 of the menstrual cycle.

Answer: (b) On days 11-17 of the menstrual cycle

Question 59. Acrosomal action of sperm is due to

    • (a) its contact with zona pellucida of ova
      (b) actions in the uterine environment of the female
      (c) actions in the epididymal environment of the male
      (d) production of androgens in the uterus.

Answer: (a) Contact of its ova with zona pellucida

Question 60. The duct from the seminal vesicles goes into the vas deferens and opens into the urethra as

    • (a) epididymis
      (b) ejaculatory duct
      (c) efferent duct
      (d) ureter.

Answer: (b) Ejaculatory duct

Question 61. Urethral meatus is related to

    • (a) Urinogenital duct
      (b) Opening of vas deferens in urethra
      (c) External opening of urogenital duct
      (d) Muscles encircling urogenital duct.

Answer: (c) External opening of urogenital duct

Question 62. Morula is a developing stage

    • (a) between zygote and blastocyst
      (b) between blastocyst and gastula
      (c) post- implantation
      (d) between implantation and delivery.

Answer: (a) Between zygote and blastocyst

Question 63. The membrane covering the ovum at the time of ovulation is

    • (a) corona radiata
      (b) zona radiata
      (c) zona pellucida
      (d) chorion.

Answer: (a) Corona Radiata

Question 64. Bartholin’s glands are located on

    • (a) either side of vagina in man
    • (b) on either side of vas deferens in man
    • (c) on either side of penis in man
    • (d) on either side of fallopian tube in man.

Answer: (a) Both sides of the vagina in humans

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