12th Class Biology Chapter 15 MCQs with Answers

Welcome to the 12th Class Biology Chapter 15 MCQs Online Test. We are presenting you with top MCQ questions from the 12th Class Biology Chapter Homeostasis.

We want to tell you that you can find all the 12th Class Biology Chapter 15 MCQs online tests on our website. These online tests are great for learning and as well as for scoring maximum marks in your Intermediate Exams. We are making these Class 12 Biology MCQs online tests for those who want full marks in their exams. Attempt all these Grade 12 Biology Online Multiple Choice Questions MCQs before going for the exam and it will be beneficial for you! These online tests contain all the important multiple choice questions in the important topics of the FSC Part 2 Biology Chapter 15 Homeostasis. 

12th Class Biology Chapter 15 MCQs with Answers

Youth For Pakistan has provided an excellent opportunity for the students of the 12th class to prepare their Biology Chapter 15 Homeostasis online with MCQs test.

This is a free platform for students to prepare for Biology Exams for Class 12 to get the best accomplishments in annual exams. 12th class Students can analyze themself by attempting this online test system as many times as they want until they find themself fully prepared.

MCQs Class 12 Biology with Answers

The purpose of these online MCQs tests is to help you evaluate your 12th Class Biology Chapter 15 MCQs. These Multiple Choice Questions (MCQs) will prepare you for your academic success in the 12th Class Exams. 12th Class Biology Chapters include Ch#15 Homeostasis, Ch#16 Support and Movement, Ch#17 Coordination and Control, Ch#18 Reproduction, Ch#19 Growth and Development, Ch#20 Chromosome and DNA, Ch#21 Cell Cycle, Ch#22 Variation and Genetics, Ch#23 Biotechnology, Ch#24 Evolution, Ch#25 Ecosystem, Ch#26 Some major Ecosystems and Ch#27 Man and his Environment. 

What is Homeostasis?

Each organism of a species has assumed, in evolutionary history, a specific setup of the internal environment at various levels of organization suitable to its surroundings i.e., the external environment. The external environment and its components fluctuate continuously, however, the organism resists and manages these changes by making adjustments to keep its own internal fluctuations within a narrow range thus protecting the internal environment from the harms of the external fluctuations. The protection of the internal environment from the harms of fluctuations in the external environment is termed homeostasis. Homeostasis keeps the internal fluctuations in a narrow range with various control systems compared to wider external fluctuations.

12th Class Biology Chapter 15 MCQs: Homeostasis

1. The more concentrated environment is termed as choose which one is correct:

• Anisotonic
• Isotonic
• Hypotonic
• Hypertonic

2. Mango plant is choose which one is correct:

• Mesophyt
• Hydrophyte
• Xerophyte
• None of the above

3. The excretory system of Planaria called choose which one is correct:

• Metanephridium
• Protonephridium
• Nephrone
• Nephridium

4. In urea cycle, one molecule of Amonia and one molecule of co<sub>2>/sub> combine with one molecule of ornithine to form choose which one is correct:

• Urea
• Arginine
• Arginosuccinate
• Citrulline

5. Unlike an earthworm, metanephridia in mammalian nephrone choose which one is correct:

• Filters blood instead of coelomic fluid
• Function in both osmoregulation and excretion of nitrogenous wastes
• Form urine by changing the composition of fluid inside the tubule
• Is intimately associated with a capillary network

6. Which process in the nephrone is least selective?

• Filteration
• Transport across the epithelium of a collecting duct
• Reabsorption
• Secretion

7. Malpighian tubules are excretory organs found in choose which one is correct:

• Vertebrate
• Annelids
• Insects
• Flatworms

8. Amonia is secreted by most choose which one is correct:

• Adult amphibians
• Organism that produce eggs
• Bony fishes
• Insect

9. The vertebrate liver functions in all the following regulatory processes except choose which one is correct:

• Detoxification of harmful chemicals
• Energy reserves in the formation of glycogen
• Production of Nitrogenous wastes
• Osmoregulation by variable excretion of salts

10. Non-shivering thermogenesis is choose which one is correct:

• A hormone triggers the heat production by increasing metabolic rate
• A behavioral adaptation for absorbing heat in ectotherms
• Muscle contraction by movements as in winter months
• A heat producing method of large fishes

11. Urea can be eliminated with quantity of water as compared to ammonia choose which one is correct:

• 1/10
• 1/20
• 1/5
• 1/50

12. Oxalates are present in choose which one is correct:

• Meat
• Tomatoes
• Green vegetable only
• Green vegetable and tomatoes
• 13. Movement of ground squirrel to burrows in midday heat is an choose which one is correct:

• Physiological adaptation
• Structural adaptation
• Behavioral adaptation
• Morphological & physiological adaptations

14. Normal body temperature range between choose which one is correct:

• 36.1^oC – 37.8^oC
• 36.0^oC – 38.8^oC
• 36.7^oC – 37.8^oC
• 37.1^oC – 38.6^oC

15. Humming bird belongs to a category called choose which one is correct:

• Heterothem
• Poikilotherms
• Ectothem
• Endotherm

16. Vasodilation choose which one is correct:

• Nucleic acid
• Increase the blood supply to the skin
• Protein
• ADH

17. Nitrogenous base choose which one is correct:

• Ectotherm
• Protien
• Nucleic acid
• ADH

18. Reptile choose which one is correct:

• Protein
• Ectotherm
• Nucleic acid
• ADH

19. Collecting duct choose which one is correct:

• ADH
• Protein
• Ectotherm
• Increase the blood supply to the skin

20. Dialyzer choose which one is correct:

• 15%
• Kidney machine
• Adrenal cortex
• Presence of sweat gland

21. Stone of uric acid choose which one is correct:

• Adrenal cortex
• 15%
• Kidney machine
• 10%

22. Structural adaptation choose which one is correct:

• Presence of sweat gland
• Liver
• Kidney machine
• Adrenal cortex

23. Aldosterone choose which one is correct:

• Presence of sweat gland
• Adrenal cortex
• Liver
• Kidney machine

24. Nephron choose which one is correct:

• Passive loss of water from gills
• Kidney
• Large amount of hypotonic contain little salt
• Body fluid isotonic to external environment

25. Fresh water fish choose which one is correct:

• Body fluid isotonic to external environment
• Passive loss of water from gills
• Large amount of hypotonic urine contain little salt
• Kidney

26. Bile choose which one is correct:

• Liver
• Body fluid isotonic to external environment
• Kidney
• Large amount of hypotonic urine contain little salt

27. Osmoconformers?

• Body fluid isotonic to external environment
• Passive loss of water from gills
• Large amount of hypotonic urine contain little salt
• Kidney

28. Thermoreceptors choose which one is correct:

• Cockroach
• Hypothalamus
• Loop of Henle
• Bowman capsule

29. Uric acid choose which one is correct:

• Cockroach
• Loop of Henle
• Bowman capsule
• Hypothalamus

30. Lithotripsy choose which one is correct:

• Cockroach
• Hypothalamus
• Loop of Henle
• Non-surgical removal of gall bladder stone

31. Posterior lobe choose which one is correct:

• Active transport
• Sensor
• Passive transport
• Ant diuretic hormone

32. Ascending loop of Henle choose which one is correct:

• Passive transport
• Active transport of Na⁺ ions
• Sensor
• Native to cold region

33. Oak choose which one is correct:

• Passive transport
• Active transport
• Sensor
• Native to cold region

34. Receptors choose which one is correct:

• Sensor
• Native to cold region
• Antidiuretic Hormone
• Passive transport

35. Homeostasis ithe s process of maintaining a constant environment despite conditions choose which one is correct:

• External internal
• Internal external
• Both (A) and (B)
• None of these

36. Homeostasis is based on choose which one is correct:

• Thermoregulation only
• Catabolism
• Feed back mechanism
• Anabolism

37. Two major control centers for homeostasis are choose which one is correct:

• Exocrine and endocrine glands
• Apocrine and Heterocrine glands
• Receptors and effectors
• Brain and endocrine glands

38. Which of the following activity is regulated by homeostasis?

• Temperature
• Water balance
• Blood sugar level
• All (A), (B) and (C)

39. An animal when taken into hot area looses heat by sweating and when to cold area increases muscular activity to produce more heat. The animal is choose which one is correct:

• Homeothermic
• Poikilothermic
• Ectothermic
• None of these

40. What are the components of feed back mechanism?

• Receptors, insulators, effectors
• Receptors, suppressors, effectors
• Receptors, regulators, effectors
• Receptors, depressors, effectors

41. A cell is placed in a solution and swells. This solution is choose which one is correct:

• Isotonic to cell
• Hypertonic to cell
• Hypotonic to cell
• None of these

42. In an isotonic there would be choose which one is correct:

• No net movement of water
• Net movement of water into the cell
• Net movement of water out of the cell
• Bursting of the cell

43. A cell whose internal salt concentration is 0.3 per liter is placed in a solution having salt concentration 0.5 per liter. The solution is choose which one is correct:

• Isotonic to the cell
• Hypotonic to the cell
• Hypertonic to cell
• None of these

44. Osmosis is defined as choose which one is correct:

• Flow of solvent through semi-permeable membrane from higher to less concentrated solution
• Flow of solvent through semi-permeable membrane from less to higher concentrated solution
• Flow of a solute from a semi-permeable membrane
• Flow of water without membrane

45. Plasmolysis of a human red blood cell would occur if the cell were choose right option choose which one is correct:

• In an isotonic solution
• In a hypertonic solution
• In a hypotonic solution
• None of the above

46. When an animal cell is placed in a hypotonic environment,it will choose which one is correct:

• Undergo cytolysis
• Undergo plasmolysis
• Be at equilibrium
• Its turgor pressure decreases

47. The contractile vacuole of a paramecium should be active when the paramecium is in choose which one is correct:

• An isotonic environment
• A hypotonic environment
• A hypertonic environment
• Any environment

48. The tendency of a solution to take up water when separated from pure water by a selectively permeable membrane is called choose which one is correct:

• Osmotic pressure
• Turgor pressure
• Diffusion pressure deficit
• Water potential

49. Xerophytes have choose which one is correct:

• Deep roots for water uptake
• Succulent stems for storage of water
• Few stomata to limit water loss
• All (A), (B) and (C)

50. A plant without cuticle in leaves and stem, having increased number of stomata, partially or completely submerged in water is choose which one is correct:

• Mesophyte
• Hydrophyte
• Both (A) and (B)
• Halophyte

51. The entry of water from salty soil into roots of halophytes takes place because the root of halophytes develop choose which one is correct:

• High water potential
• Low osmotic pressure
• Low water potential
• All of these

52. Animals that do not adjust their internal osmoregularity and are isotonic with their environment are choose which one is correct:

• Osmoconformers
• Osmoregulators
• Thermoregulators
• Thermoconfermors

53. Animals that are not isotonic with their environment and have developed mechanisms to regulate their internal solute and water concentrations are choose which one is correct:

• Osmoconformers
• Osmoregulators
• Thermoregualtors
• Both (A) and (B)

54. Displace the set point of hypothalamus above the normal point of 37°C choose which one is correct:

• Pyrenins
• Pyridoxins
• Pyrogens
• All (A), (B) and (C)

55. An increase in blood sugar level triggers the release of the hormone insulin b the pancreas, the hormone insulin lowers blood sugar level restoring the body to its original blood glucose level by converting glucose to glycogen. This is an example of choose which one is correct:

• Positive feed back
• Negative feed back
• Homeostatic imbalance
• None of these

56. A fish in fresh water choose which one is correct:

• Produces dilute urine
• Have a hypertonic body
• Produces concentrated urine
• (A) and (B)

57. To hags fishes,sea water is choose which one is correct:

• Isotonic
• Hypotonic
• Hypertonic
• None of these

58. A fish in marine water choose which one is correct:

• Produces concentrated urine
• Have a hypotonic body
• Produces dilute urine
• (A) and (B)

59. Metabolic water is choose which one is correct:

• Water outside the cells of animals
• Produced by oxidation of fats
• Useful to desert mammals
• (B) and (C)

60. Plants do not excrete ammonia, urea and uric acid because choose which one is correct:

• They lack nitrogenous waste
• Their metabolism is protein based
• Their nitrogenous products are recycled
• All (A), (B) and (C)

61. Plants excrete choose which one is correct:

• Excess water
• Excess oxygen
• Excess carbon dioxide
• All (A), (B) and (C)

62. Which one of the following has maximum toxicity?

• Ammonia
• Urea
• Uric acid
• Creatinine

63. Which one of the following has medium toxicity?

• Ammonia
• Urea
• Uric acid
• Water

64. Which one of the following has least toxicity?

• Ammonia
• Urea
• Uric acid
• All are highly toxic

65. Guttation take place through choose which one is correct:

• Stomata
• Injured tissue
• Lenticels
• Hydathodes

66. The excretory organs of Planaria are known as choose which one is correct:

• Protonephridia
• Flame cells
• Both (A) and (B)
• Metanephridia

67. Tubular excretory system of earth worm consists of choose which one is correct:

• Protonephridia
• Coxal gland
• Malpighian tubules
• Metanephridia

68. The internal opening of the metanephridium is knows as choose which one is correct:

• Nephrostoms
• Nephridiopore
• Excretory pore
• All (A), (B) and (C)

69. Liver Synthesizes choose which one is correct:

• Non-essential aminoacids
• Plasma proteins
• Cholesterol
• All (A), (B) and (C)

70. In humans, excess nitrogen is eliminated form the body by mainly converting it to choose which one is correct:

• Urea
• Uric acid
• Ammonia
• Amine phosphate

71. The liver is choose which one is correct:

• Smallest internal organ
• Medium-sized internal organ
• Body s largest internal organ
• All options are incorrect

72. The three major body fuels managed by the liver are choose which one is correct:

• Protein, vitamins and minerals
• Carbohydrate, fat and protein
• Glucose, fructose and sucrose
• Glucose, iron and protein

73. Pigments found in bile are formed during catabolism choose which one is correct:

• Haem catabolism
• Globin catabolism
• Cholesterol catabolism
• Both (A) and (C)

74. The nephron is choose which one is correct:

• The site of urine storage
• The function unit of the kidney
• The site where ADH is produced
• Also called the “Bowman’s capsule”

75. From the distal convoluted tubule, filtrate will be carried to the choose which one is correct:

• Renal corpuscle
• Collecting duct
• Nephron loop
• Proximal convoluted tubule

76. All of the following are normally found in urine except choose which one is correct:

• Sodium ions
• Uric acid
• Creatinine
• Glucose

77. Hormone regulates the transfer of sodium from the nephron to the blood choose which one is correct:

• Parathormone
• Anti-diuretic
• Aldosterone
• Vasopression

78. Conversion of ammonia into urea, occurs in choose which one is correct:

• Kidneys
• Lungs
• Intestine
• Liver

79. Separation of amino acid into amino and carboxyl group is know as choose which one is correct:

• Amination
• Excretion
• Deamination
• Egestion

80. Uric acid is the chief nitrogenous waste material in the excretory system of choose which one is correct:

• Reptiles
• Birds
• Insects
• All of these

81. Which of the following is not structure of kidney choose which one is correct:

• Cortex
• Medulla
• Pelvis
• Urethra

82. In mammalian kidney, the pyramids are seen in choose which one is correct:

• Cortex
• Medulla
• Pelvis
• Hilus

83. The number of nephrons in ONE kidney of man is choose which one is correct:

• 4 million
• 2 million
• 8 million
• 1 million

84. ADH increases ——— of ———–from the collecting duct choose which one is correct:

• Absorption, sodium
• Diffusion, chlorine
• Absorption, water
• Diffusion, Ammonia

85. Two counter-current systems are formed in the kidney by the choose which one is correct:

• Henle’s loop and PCT
• Henle’s loop and DCT
• Henle’s loop and collecting duct
• Henle’s loop and vasa rectae

86. Cholesterol is excreted in the choose which one is correct:

• Sebum
• Bile
• Sweat
• Both (A) and (B)

87. Malpighian body is composed of choose which one is correct:

• Bowman’s capsule only
• Glomerulus only
• Bowman’s capsule & Glomerulus
• Henle’s loop and vasa rectae

88. Daily urine output of man is choose which one is correct:

• 1-2 liters
• 1-3 liters
• 1-4 liters
• 1-5 liters

89. Tubular structure which carries urine from bladder to outside choose which one is correct:

• Ureter
• Hilus
• Pelvis
• Urethra

90. Ultrafiltration occurs in choose which one is correct:

• Bowman s capsule
• Proximal convoluted tube
• Henle s loop
• Distal convoluted tube

91. The greater the demand of conserving water, the greater would be the number of choose which one is correct:

• Juxta-medullary nephrons
• Cortical nephrons
• Capillaries of glomerulus
• Both (A) and (B)

92. Each kidney is enclosed by a thin membranous covering called choose which one is correct:

• Peritonium
• Peritreme
• Perizonium
• All (A), (B) and (C)

93. Ph of human urine is choose which one is correct:

• 7.4
• 3.5
• 5.00
• 8.00

94. The hormone which increases the reabsorption of calcium ions in nephron is choose which one is correct:

• Aldosterone
• Parathormone
• Anti-diuretic
• Vasopression

95. The process by which some poisonous substances are secreted from peritubular capillaries into nephric filtrate is termed as choose which one is correct:

• Tubular reabsorption
• Tubular secretion
• Counter-current exchange
• None of these

96. It is a cyclic process of enzymatic reactions which operates in the liver cells as a result of which urea is formed from ammonia, carbondioxide and NH2 group choose which one is correct:

• Ornithine cycle
• Citruline cycle
• Arginine cycle
• All of these

97. Regulation of body temperature in homiotherms during cold environmental temperature involve choose which one is correct:

• Vaso-consriction
• Erection of hairs
• Increase in sub-cutaneous fat
• All (A), (B) and (C)

98. Blood enters the kidney through a branch of aorta called choose which one is correct:

• Afferent arteriole
• Renal artery
• Efferent arteriole
• Renal vein

99. A capillary tuft from which fluid leaves the circulatory system choose which one is correct:

• Bowman capsule
• Proximal convoluted tube
• Glomerulus
• Loop of Henle

100. In ectotherms and endotherms heat can be lost through choose which one is correct:

• Evaporation
• Radiation
• Convection
• All (A), (B) and (C)

101. Percentage of kidney stones composed of calcium oxalate phosphate choose which one is correct:

• 5%
• 20%
• 70%
• 90%

102. About % of kidney stones composed of uric acid choose which one is correct:

• 5%
• 20%
• 70%
• 90%

103. Dialysis cleans the blood by choose which one is correct:

• An artificial kidney
• Filtering it within abdomen
• Removing glucose from blood
• Both (A) and (B)

104. Haemodialysis means choose which one is correct:

• Removing the blood
• Cleaning the blood
• Diluting the blood
• All options are correct

105. These are animals that produce metabolic heat at low rates and rely primarily on conditions of their surroundings choose which one is correct:

• Endotherms
• Heterotherms
• Ectotherms
• Both (B) and (C)

106. These are animals capable of varying degrees of endothermic heat production, but they generally do not regulate body temperature within as narrow a range as endotherms choose which one is correct:

• Ectotherms
• Poikilotherms
• Hearotherms
• None of these

107. It is technique of breaking stones inside kidneys, ureters and urinary bladder choose which one is correct:

• Lithotrophy
• Lithography
• Lithotripsy
• All options are correct

108. Mammals maintain their body temperature within a range of choose which one is correct:

• 25°C to 35°C
• 30°C to 40°C
• 36°C to 43°C
• 36°C to 38°C

109. Birds maintain their body temperature within a range of choose which one is correct:

• 25°C to 35°C
• 30°C to 40°C
• 41°C to 43°C
• 36°C to 38°C

110. Regulation of body temperature in homiotherms during high environmental temperature involve choose which one is correct:

• Vaso-dilation
• Lowering the hairs
• Reduction in sub-cutaneous fat
• All (A), (B) and (C)