How Do Organisms Reproduce? MCQs Class 10 with Answers

๐Ÿ“˜ Chapter 7: How Do Organisms Reproduce? โ€“ Class 10 Science

Looking for easy and effective ways to revise Chapter 8 of Class 10 Science? Youโ€™re in the right place! Here, weโ€™ve compiled over 100 multiple choice questions (MCQs) based on the latest CBSE syllabus. These questions cover everything from asexual reproduction to human reproductive systems, and include answers in a neat, click-to-reveal format.

Whether youโ€™re preparing for boards, classroom tests, or just brushing up your biology concepts, these MCQs will make learning fun and engaging. Letโ€™s dive in! ๐ŸŒฑ

1. ๐ŸŒฑ Which method of reproduction is common in unicellular organisms?

  • A. Budding
  • B. Binary fission
  • C. Fragmentation
  • D. Spore formation
๐Ÿ” Show Answer

โœ… B. Binary fission

2. ๐Ÿงฌ What is the function of testes in human males?

  • A. Production of ova
  • B. Production of estrogen
  • C. Production of sperm and testosterone
  • D. Fertilization of egg
๐Ÿ” Show Answer

โœ… C. Production of sperm and testosterone

3. ๐ŸŒฟ Which structure in plants helps in vegetative propagation?

  • A. Roots
  • B. Flowers
  • C. Seeds
  • D. Stem tubers
๐Ÿ” Show Answer

โœ… D. Stem tubers

4. ๐Ÿคฐ In which female organ does fertilization usually take place?

  • A. Ovary
  • B. Vagina
  • C. Fallopian tube
  • D. Uterus
๐Ÿ” Show Answer

โœ… C. Fallopian tube

5. ๐Ÿชธ Which of the following is a form of asexual reproduction in Hydra?

  • A. Binary fission
  • B. Budding
  • C. Fragmentation
  • D. Spore formation
๐Ÿ” Show Answer

โœ… B. Budding

6. ๐Ÿฉบ Which hormone triggers the release of an egg during ovulation?

  • A. Estrogen
  • B. FSH
  • C. LH
  • D. Progesterone
๐Ÿ” Show Answer

โœ… C. LH

7. ๐Ÿ„ Which organism reproduces by spore formation?

  • A. Yeast
  • B. Amoeba
  • C. Rhizopus
  • D. Planaria
๐Ÿ” Show Answer

โœ… C. Rhizopus

8. ๐Ÿšซ Which of the following is not a sexually transmitted disease?

  • A. Gonorrhea
  • B. Hepatitis B
  • C. Syphilis
  • D. Typhoid
๐Ÿ” Show Answer

โœ… D. Typhoid

9. ๐Ÿ›ก๏ธ Which contraceptive method prevents sperm reaching the uterus?

  • A. Oral pills
  • B. Copper-T
  • C. Condom
  • D. IUD
๐Ÿ” Show Answer

โœ… C. Condom

10. ๐Ÿ‘ซ What is the chromosomal composition of a human male?

  • A. XX
  • B. XY
  • C. XO
  • D. YY
๐Ÿ” Show Answer

โœ… B. XY

11. ๐ŸŒพ Which plant part is used in artificial vegetative propagation?

  • A. Leaf
  • B. Stem cutting
  • C. Flower
  • D. Seed
๐Ÿ” Show Answer

โœ… B. Stem cutting

12. ๐Ÿงซ Which microbe reproduces by binary fission?

  • A. Paramecium
  • B. Amoeba
  • C. Bacteria
  • D. Fungi
๐Ÿ” Show Answer

โœ… C. Bacteria

13. ๐Ÿ„ In fungi, spores are produced in structures called:

  • A. Conidia
  • B. Sporangia
  • C. Buds
  • D. Zygotes
๐Ÿ” Show Answer

โœ… B. Sporangia

14. ๐Ÿฅš What type of reproduction involves gamete fusion?

  • A. Asexual
  • B. Sexual
  • C. Budding
  • D. Regeneration
๐Ÿ” Show Answer

โœ… B. Sexual

15. ๐ŸŒฑ Which hormone promotes fruit drop?

  • A. Auxin
  • B. Ethylene
  • C. Cytokinin
  • D. Gibberellin
๐Ÿ” Show Answer

โœ… B. Ethylene

16. ๐Ÿšผ Which process ensures genetic variation?

  • A. Binary fission
  • B. Budding
  • C. Fertilization
  • D. Spore formation
๐Ÿ” Show Answer

โœ… C. Fertilization

17. ๐Ÿฆ  Yeast reproduces by:

  • A. Binary fission
  • B. Budding
  • C. Fragmentation
  • D. Spore formation
๐Ÿ” Show Answer

โœ… B. Budding

18. ๐ŸŽ‹ Which vegetative propagation uses leaf buds?

  • A. Grafting
  • B. Layering
  • C. Leaf cutting
  • D. Tissue culture
๐Ÿ” Show Answer

โœ… C. Leaf cutting

19. ๐Ÿคฑ The placenta facilitates:

  • A. Waste removal
  • B. Nutrient exchange
  • C. Gas exchange
  • D. All of the above
๐Ÿ” Show Answer

โœ… D. All of the above

20. ๐Ÿงฌ Which term describes development of a new individual from a part?

  • A. Regeneration
  • B. Fragmentation
  • C. Budding
  • D. Sporulation
๐Ÿ” Show Answer

โœ… B. Fragmentation

21. ๐Ÿ‘ถ Which structure produces milk in mammals?

  • A. Urethra
  • B. Mammary glands
  • C. Ovary
  • D. Pituitary
๐Ÿ” Show Answer

โœ… B. Mammary glands

22. ๐Ÿต๏ธ Which flower part develops into fruit?

  • A. Ovary
  • B. Petal
  • C. Stamen
  • D. Sepal
๐Ÿ” Show Answer

โœ… A. Ovary

23. ๐Ÿฉธ The fluid in which sperm swim is:

  • A. Blood
  • B. Semen
  • C. Plasma
  • D. Lymph
๐Ÿ” Show Answer

โœ… B. Semen

24. ๐ŸŒธ Which process forms seeds without fertilization?

  • A. Parthenogenesis
  • B. Pollination
  • C. Double fertilization
  • D. Budding
๐Ÿ” Show Answer

โœ… A. Parthenogenesis

25. ๐ŸŒ IVF stands for:

  • A. In vivo fertilization
  • B. In vitro fertilization
  • C. Internal vesicle formation
  • D. Instant variation factor
๐Ÿ” Show Answer

โœ… B. In vitro fertilization

26. ๐Ÿงซ Which cell division leads to gamete formation?

  • A. Mitosis
  • B. Meiosis
  • C. Binary fission
  • D. Budding
๐Ÿ” Show Answer

โœ… B. Meiosis

27. ๐Ÿฆ  Which method of reproduction is seen in Spirogyra?

  • A. Conjugation
  • B. Budding
  • C. Binary fission
  • D. Spore formation
๐Ÿ” Show Answer

โœ… A. Conjugation

28. ๐Ÿ›ก๏ธ Which barrier prevents sperm entry into the uterus?

  • A. Condom
  • B. Diaphragm (contraceptive)
  • C. IUD
  • D. All of the above
๐Ÿ” Show Answer

โœ… D. All of the above

29. ๐ŸŒก๏ธ Which hormone maintains pregnancy?

  • A. Estrogen
  • B. Progesterone
  • C. LH
  • D. FSH
๐Ÿ” Show Answer

โœ… B. Progesterone

30. ๐ŸŒฑ Which technique produces disease-free plants?

  • A. Layering
  • B. Grafting
  • C. Tissue culture
  • D. Cutting
๐Ÿ” Show Answer

โœ… C. Tissue culture

31. ๐Ÿ—‚๏ธ Which technique is used to clone plants in labs?

  • A. Grafting
  • B. Layering
  • C. Tissue culture
  • D. Cutting
๐Ÿ” Show Answer

โœ… C. Tissue culture

32. ๐Ÿงฌ What is the ploidy of gametes in humans?

  • A. Diploid
  • B. Haploid
  • C. Polyploid
  • D. Triploid
๐Ÿ” Show Answer

โœ… B. Haploid

33. ๐ŸŒฟ Which part of Bryophyllum leaf gives rise to new plantlets?

  • A. Margin
  • B. Midrib
  • C. Veins
  • D. Petiole
๐Ÿ” Show Answer

โœ… A. Margin

34. ๐Ÿฆ  Which protozoan reproduces by multiple fission?

  • A. Paramecium
  • B. Amoeba
  • C. Plasmodium
  • D. Euglena
๐Ÿ” Show Answer

โœ… C. Plasmodium

35. โš™๏ธ What process produces haploid spores in plants?

  • A. Mitosis
  • B. Meiosis
  • C. Fragmentation
  • D. Budding
๐Ÿ” Show Answer

โœ… B. Meiosis

36. ๐Ÿคฐ Which organ produces progesterone?

  • A. Testes
  • B. Ovary
  • C. Adrenal gland
  • D. Pituitary
๐Ÿ” Show Answer

โœ… B. Ovary

37. ๐ŸŒธ Which cell division increases chromosome number?

  • A. Mitosis
  • B. Meiosis I
  • C. Meiosis II
  • D. None
๐Ÿ” Show Answer

โœ… D. None

38. ๐Ÿงช Which structure stores pollen grains?

  • A. Ovule
  • B. Anther
  • C. Stigma
  • D. Style
๐Ÿ” Show Answer

โœ… B. Anther

39. ๐Ÿ” What ensures alternation of generations in plants?

  • A. Spore germination
  • B. Seed formation
  • C. Gamete fusion
  • D. Both A and C
๐Ÿ” Show Answer

โœ… D. Both A and C

40. ๐ŸŒฟ Which vegetative method uses underground stems?

  • A. Corms
  • B. Rhizomes
  • C. Runners
  • D. Bulbs
๐Ÿ” Show Answer

โœ… B. Rhizomes

41. ๐Ÿฅ Which disease can be prevented by vaccination of HPV?

  • A. AIDS
  • B. Cervical cancer
  • C. Malaria
  • D. Yellow fever
๐Ÿ” Show Answer

โœ… B. Cervical cancer

42. ๐ŸŒก๏ธ What is the viability period of a human ovum?

  • A. 1 day
  • B. 3 days
  • C. 7 days
  • D. 14 days
๐Ÿ” Show Answer

โœ… A. 1 day

43. ๐Ÿงซ Which method is used for rapid mass propagation of elite plants?

  • A. Grafting
  • B. Tissue culture
  • C. Cutting
  • D. Layering
๐Ÿ” Show Answer

โœ… B. Tissue culture

44. ๐Ÿฅš Which substance nourishes the embryo in mammals?

  • A. Amniotic fluid
  • B. Placenta
  • C. Yolk sac
  • D. Uterine lining
๐Ÿ” Show Answer

โœ… B. Placenta

45. โš–๏ธ Which hormone regulates blood sugar?

  • A. Glucagon
  • B. Insulin
  • C. Adrenaline
  • D. Cortisol
๐Ÿ” Show Answer

โœ… B. Insulin

46. ๐ŸŒฟ Which part of mango plant is used for grafting?

  • A. Seed
  • B. Scion & Rootstock
  • C. Leaf
  • D. Flower
๐Ÿ” Show Answer

โœ… B. Scion & Rootstock

47. ๐Ÿ›ก๏ธ Which contraceptive releases hormones?

  • A. Condom
  • B. Copper IUD
  • C. Oral pill
  • D. Diaphragm
๐Ÿ” Show Answer

โœ… C. Oral pill

48. ๐ŸŒฑ Which hormone promotes root growth?

  • A. Auxin
  • B. Gibberellin
  • C. Cytokinin
  • D. Abscisic acid
๐Ÿ” Show Answer

โœ… A. Auxin

49. ๐Ÿฆ  Which STD is caused by bacteria?

  • A. HIV/AIDS
  • B. Gonorrhea
  • C. Herpes
  • D. Hepatitis
๐Ÿ” Show Answer

โœ… B. Gonorrhea

50. ๐Ÿ‘จโ€๐Ÿ‘ฉโ€๐Ÿ‘งโ€๐Ÿ‘ฆ Which reproductive method combines traits of both parents?

  • A. Budding
  • B. Asexual fission
  • C. Sexual reproduction
  • D. Spore formation
๐Ÿ” Show Answer

โœ… C. Sexual reproduction

51. ๐Ÿงฌ What is the role of the epididymis in males?

  • A. Produce sperm
  • B. Store and mature sperm
  • C. Secrete testosterone
  • D. Transport ova
๐Ÿ” Show Answer

โœ… B. Store and mature sperm

52. ๐ŸŒฑ Which plant hormone is responsible for leaf fall?

  • A. Auxin
  • B. Ethylene
  • C. Abscisic acid
  • D. Cytokinin
๐Ÿ” Show Answer

โœ… C. Abscisic acid

53. ๐Ÿฆ  Which protozoan reproduces by multiple fission?

  • A. Amoeba
  • B. Plasmodium
  • C. Paramecium
  • D. Euglena
๐Ÿ” Show Answer

โœ… B. Plasmodium

54. โš–๏ธ In human males, testosterone is produced by?

  • A. Seminiferous tubules
  • B. Leydig cells
  • C. Sertoli cells
  • D. Spermatogonia
๐Ÿ” Show Answer

โœ… B. Leydig cells

55. ๐ŸŒฟ Which part of a cactus helps in vegetative propagation?

  • A. Root
  • B. Leaf
  • C. Stem segment
  • D. Flower
๐Ÿ” Show Answer

โœ… C. Stem segment

56. ๐Ÿ”ฌ Which technique allows rapid disease-free plant multiplication?

  • A. Grafting
  • B. Layering
  • C. Tissue culture
  • D. Budding
๐Ÿ” Show Answer

โœ… C. Tissue culture

57. ๐Ÿšผ Which structure carries ovum from ovary to uterus?

  • A. Urethra
  • B. Oviduct
  • C. Ureter
  • D. Fallopian tube
๐Ÿ” Show Answer

โœ… B. Fallopian tube

58. ๐Ÿงช Which hormone is secreted by corpus luteum?

  • A. Estrogen
  • B. Progesterone
  • C. LH
  • D. FSH
๐Ÿ” Show Answer

โœ… B. Progesterone

59. ๐ŸŒธ What is anthesis in flowering plants?

  • A. Fruit formation
  • B. Flower withering
  • C. Anther dehiscence
  • D. Petal unfurling
๐Ÿ” Show Answer

โœ… C. Anther dehiscence

60. โš™๏ธ Which process involves fusion of male and female gametes?

  • A. Pollination
  • B. Fertilization
  • C. Germination
  • D. Double fertilization
๐Ÿ” Show Answer

โœ… B. Fertilization

61. ๐Ÿงฌ What term describes organisms producing both male and female gametes?

  • A. Dioecious
  • B. Monoecious
  • C. Hermaphrodite
  • D. Parthenogenetic
๐Ÿ” Show Answer

โœ… C. Hermaphrodite

62. ๐Ÿฅš Which structure encloses embryo in seed?

  • A. Endosperm
  • B. Seed coat
  • C. Cotyledon
  • D. Testa
๐Ÿ” Show Answer

โœ… B. Seed coat

63. ๐Ÿ‘ถ Which process describes birth of live young?

  • A. Oviparous
  • B. Viviparous
  • C. Ovoviviparous
  • D. Asexual
๐Ÿ” Show Answer

โœ… B. Viviparous

64. ๐ŸŒฟ Which vegetative method uses leaf buds?

  • A. Grafting
  • B. Budding
  • C. Layering
  • D. Leaf cutting
๐Ÿ” Show Answer

โœ… D. Leaf cutting

65. ๐Ÿฆ  Which entity reproduces by sporulation?

  • A. Yeast
  • B. Mucor
  • C. Amoeba
  • D. Hydra
๐Ÿ” Show Answer

โœ… B. Mucor

66. ๐ŸŒธ Which part of pistil receives pollen?

  • A. Ovary
  • B. Style
  • C. Stigma
  • D. Anther
๐Ÿ” Show Answer

โœ… C. Stigma

67. โš—๏ธ Which technique is used for embryo transfer in cattle?

  • A. Budding
  • B. IVF
  • C. Embryo transplant
  • D. Cloning
๐Ÿ” Show Answer

โœ… C. Embryo transplant

68. ๐Ÿ” Which reproductive strategy aids survival in harsh conditions?

  • A. Sexual reproduction
  • B. Asexual reproduction
  • C. Spore formation
  • D. Both B and C
๐Ÿ” Show Answer

โœ… C. Spore formation

69. ๐Ÿง  Which part of the brain regulates reproductive hormones?

  • A. Medulla
  • B. Hypothalamus
  • C. Cerebellum
  • D. Cerebrum
๐Ÿ” Show Answer

โœ… B. Hypothalamus

70. ๐ŸŒŽ Which reproductive method allows adaptation to environment?

  • A. Asexual reproduction
  • B. Sexual reproduction
  • C. Vegetative propagation
  • D. Spore formation
๐Ÿ” Show Answer

โœ… B. Sexual reproduction

71. ๐Ÿฉบ Which hormone stimulates milk production?

  • A. Oxytocin
  • B. Prolactin
  • C. Estrogen
  • D. Progesterone
๐Ÿ” Show Answer

โœ… B. Prolactin

72. ๐ŸŒฑ Which vegetative propagation involves cutting and replanting?

  • A. Layering
  • B. Grafting
  • C. Cutting
  • D. Budding
๐Ÿ” Show Answer

โœ… C. Cutting

73. ๐Ÿฆ  Which bacterium reproduces rapidly in binary fission?

  • A. E. coli
  • B. Streptococcus
  • C. Lactobacillus
  • D. Staphylococcus
๐Ÿ” Show Answer

โœ… A. E. coli

74. ๐Ÿฅš Which cells produce ova in human females?

  • A. Spermatogonia
  • B. Follicle cells
  • C. Oogonia
  • D. Leydig cells
๐Ÿ” Show Answer

โœ… C. Oogonia

75. ๐ŸŒฟ Which propagation method uses underground stems?

  • A. Runners
  • B. Rhizomes
  • C. Stolons
  • D. Corms
๐Ÿ” Show Answer

โœ… B. Rhizomes

76. ๐ŸŒธ Which part becomes the seed in flowering plants?

  • A. Ovule
  • B. Anther
  • C. Stigma
  • D. Style
๐Ÿ” Show Answer

โœ… A. Ovule

77. ๐Ÿงฌ During meiosis, crossing over increases:

  • A. Chromosome number
  • B. Genetic variation
  • C. Cell size
  • D. Gamete size
๐Ÿ” Show Answer

โœ… B. Genetic variation

78. ๐Ÿšผ Which structure forms the embryo sac?

  • A. Megaspore
  • B. Microspore
  • C. Zygote
  • D. Endosperm
๐Ÿ” Show Answer

โœ… A. Megaspore

79. ๐Ÿฅผ Which lab technique separates chromosomes for karyotyping?

  • A. Gel electrophoresis
  • B. Centrifugation
  • C. Microscopy
  • D. Staining
๐Ÿ” Show Answer

โœ… A. Gel electrophoresis

80. ๐Ÿฅ Which organ stores sperms until ejaculation?

  • A. Seminal vesicle
  • B. Prostate gland
  • C. Epididymis
  • D. Vas deferens
๐Ÿ” Show Answer

โœ… C. Epididymis

81. ๐ŸŒก๏ธ Which hormone initiates labor in humans?

  • A. Oxytocin
  • B. Progesterone
  • C. Estrogen
  • D. HCG
๐Ÿ” Show Answer

โœ… A. Oxytocin

82. ๐Ÿ” Which process is identical in all asexual reproduction?

  • A. Fertilization
  • B. Budding
  • C. Cell division
  • D. Meiosis
๐Ÿ” Show Answer

โœ… C. Cell division

83. ๐ŸŒฟ What is meant by parthenocarpy?

  • A. Fruit without seed
  • B. Seed without fruit
  • C. Fruit with embryo
  • D. Seedless germination
๐Ÿ” Show Answer

โœ… A. Fruit without seed

84. ๐Ÿงซ Which reproductive disorder is characterized by absence of menstruation?

  • A. Menorrhagia
  • B. Amenorrhea
  • C. Dysmenorrhea
  • D. Oligomenorrhea
๐Ÿ” Show Answer

โœ… B. Amenorrhea

85. ๐Ÿ›ก๏ธ Which vaccination helps prevent cervical cancer?

  • A. Hepatitis B
  • B. HPV
  • C. MMR
  • D. Polio
๐Ÿ” Show Answer

โœ… B. HPV

86. ๐ŸŒฑ Which method uses bulb scales for propagation?

  • A. Corms
  • B. Bulbils
  • C. Scaling
  • D. Leaf cutting
๐Ÿ” Show Answer

โœ… C. Scaling

87. ๐Ÿง  Which gland regulates sleepโ€“wake cycle?

  • A. Pituitary
  • B. Pineal
  • C. Thymus
  • D. Thyroid
๐Ÿ” Show Answer

โœ… B. Pineal

88. โš—๏ธ Which lab technique clones animals?

  • A. Embryo transfer
  • B. Somatic cell nuclear transfer
  • C. Artificial insemination
  • D. IVF
๐Ÿ” Show Answer

โœ… B. Somatic cell nuclear transfer

89. ๐ŸŒก๏ธ Which hormone maintains uterine lining?

  • A. Estrogen
  • B. Progesterone
  • C. LH
  • D. FSH
๐Ÿ” Show Answer

โœ… B. Progesterone

90. ๐Ÿฅš Which organelle is key in gamete formation?

  • A. Mitochondria
  • B. Nucleus
  • C. Ribosome
  • D. Golgi apparatus
๐Ÿ” Show Answer

โœ… B. Nucleus

91. ๐ŸŒฟ Which hormone delays leaf senescence?

  • A. Cytokinin
  • B. Auxin
  • C. Ethylene
  • D. Abscisic acid
๐Ÿ” Show Answer

โœ… A. Cytokinin

92. ๐Ÿงซ Which STD is viral?

  • A. Gonorrhea
  • B. Syphilis
  • C. HIV/AIDS
  • D. Chlamydia
๐Ÿ” Show Answer

โœ… C. HIV/AIDS

93. ๐Ÿฅ Which organ produces seminal fluid?

  • A. Prostate gland
  • B. Seminal vesicle
  • C. Cowperโ€™s gland
  • D. Epididymis
๐Ÿ” Show Answer

โœ… B. Seminal vesicle

94. ๐ŸŒธ Which part of pistil widens to receive pollen?

  • A. Stigma
  • B. Style
  • C. Ovary
  • D. Anther
๐Ÿ” Show Answer

โœ… A. Stigma

95. ๐Ÿง  Which gland links nervous to endocrine?

  • A. Pituitary
  • B. Thyroid
  • C. Hypothalamus
  • D. Adrenal
๐Ÿ” Show Answer

โœ… C. Hypothalamus

96. ๐ŸŒฑ Which plant shows apomixis?

  • A. Mango
  • B. Citrus
  • C. Banana
  • D. Rose
๐Ÿ” Show Answer

โœ… B. Citrus

97. ๐Ÿงด Which contraceptive is hormone-based long-term?

  • A. Condom
  • B. Implant
  • C. Diaphragm
  • D. IUD
๐Ÿ” Show Answer

โœ… B. Implant

98. ๐Ÿ”ฌ What structure protects sperm DNA?

  • A. Acrosome
  • B. Head
  • C. Tail
  • D. Midpiece
๐Ÿ” Show Answer

โœ… A. Acrosome

99. ๐Ÿฉธ What fluid carries sperm?

  • A. Semen
  • B. Saliva
  • C. Plasma
  • D. Urine
๐Ÿ” Show Answer

โœ… A. Semen

100. ๐ŸŒ Which IVF step fertilizes egg outside body?

  • A. Ovulation induction
  • B. Egg retrieval
  • C. In vitro fertilization
  • D. Embryo transfer
๐Ÿ” Show Answer

โœ… C. In vitro fertilization

โ“ Frequently Asked Questions

๐ŸŒฑ Whatโ€™s the main difference between sexual and asexual reproduction?

Sexual reproduction requires fusion of gametes and leads to genetic variation, while asexual reproduction involves a single parent and produces genetically identical offspring.

๐Ÿงซ How does binary fission occur in bacteria?

The bacterial cell duplicates its DNA and divides into two equal halves, each containing a copy of the original genome.

๐ŸŒฟ What is vegetative propagation in plants?

Vegetative propagation is a form of asexual reproduction where new plants grow from stems, roots, or leaves (e.g., stem cuttings, tubers, runners).

๐Ÿคฐ Where does fertilization occur in humans?

Fertilization typically takes place in the fallopian tube, where the sperm meets and fuses with the ovum.

๐Ÿ„ How are spores different from seeds?

Spores are unicellular reproductive units produced by fungi and some plants, while seeds are multicellular structures containing an embryo, endosperm, and seed coat.

๐Ÿผ What role does the placenta play during pregnancy?

The placenta facilitates nutrient and gas exchange between mother and fetus, and produces hormones like progesterone to maintain pregnancy.

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