Class 11 Biology Chapter 12: Mineral Nutrition – 100 MCQs with Answers
1. The technique used to determine essentiality of nutrients is:
Answer: A) Hydroponics
2. The first scientist to identify essentiality of elements for plants was:
Answer: C) Julius von Sachs
3. The macronutrient required in highest amount in plants is:
Answer: A) Nitrogen
4. Essential elements are classified based on:
Answer: C) Quantitative requirements
5. Which of the following is not a micronutrient?
Answer: D) Magnesium
6. The element required for opening and closing of stomata:
Answer: B) Potassium
7. Nitrogen in plants is mainly absorbed in the form of:
Answer: B) NO3–
8. The element that is a constituent of chlorophyll is:
Answer: C) Magnesium
9. Which element is needed for synthesis of auxin?
Answer: B) Zinc
10. Chlorosis is caused due to deficiency of:
Answer: D) All of these
11. Necrosis is caused by deficiency of:
Answer: D) All of these
12. Which is a mobile nutrient in plants?
Answer: B) Potassium
13. Leghemoglobin is associated with:
Answer: C) Root nodules
14. Nitrification is carried out by:
Answer: A) Nitrosomonas
15. Enzyme nitrogenase is active under:
Answer: B) Anaerobic
16. The most abundant element in living system:
Answer: A) Oxygen
17. Which element activates RuBisCO enzyme?
Answer: A) Magnesium
18. Legume symbiosis is an example of:
Answer: A) Mutualism
19. Which is not an essential element?
Answer: B) Sodium
20. Phosphorus deficiency is visible in:
Answer: A) Old leaves
21. Biological N₂ fixation is catalysed by:
Answer: A) Nitrogenase
22. Which is a non-symbiotic nitrogen fixer?
Answer: B) Azotobacter
23. The component of ATP and nucleic acids is:
Answer: A) Phosphorus
24. Iron is a constituent of:
Answer: B) Ferredoxin
25. Boron is required in:
Answer: C) Both
26. Which is an immobile element?
Answer: C) Calcium
27. Which of the following is a chelating agent?
Answer: A) EDTA
28. The first stable product of nitrogen assimilation in plants is:
Answer: A) Glutamine
29. Deficiency of iron causes:
Answer: A) Interveinal chlorosis
30. The element present in cysteine and methionine is:
Answer: C) Sulphur
31. Black heart of potato is caused by deficiency of:
Answer: A) Oxygen
32. Chlorosis first appears in older leaves by deficiency of:
Answer: A) Nitrogen
33. The metal associated with photosystem II is:
Answer: B) Manganese
34. The mobile nutrients translocate from:
Answer: B) Old to young leaves
35. Micronutrient involved in splitting of water in photosynthesis:
Answer: B) Manganese
36. Nitrate reductase is a:
Answer: B) Molybdenum enzyme
37. Nitrogenase catalyzes:
Answer: C) N₂ to ammonia
38. Which is the first ion to enter the nodules during N₂ fixation?
Answer: B) Fe2+
39. The element essential for pollen tube growth is:
Answer: B) Boron
40. The first enzyme in ammonium assimilation is:
Answer: A) Glutamine synthetase
41. Deficiency of which causes little leaf disease?
Answer: B) Zinc
42. The site of nitrate reduction in plants is:
Answer: A) Cytosol
43. Which of the following is a micronutrient?
Answer: C) Iron
44. Enzyme urease requires:
Answer: A) Nickel
45. Which is an essential component of cytochromes?
Answer: A) Iron
46. Iron is required for:
Answer: B) Chlorophyll synthesis
47. The element involved in phloem transport is:
Answer: A) Boron
48. Zinc is a component of which hormone?
Answer: A) Auxin
49. Leghemoglobin pigment is:
Answer: B) Red
50. The first step in N₂ fixation involves:
Answer: B) Reduction
51. Out of these, which is NOT an essential micronutrient?
Answer: B) Selenium
52. Which enzyme needs iron as cofactor?
Answer: A) Catalase
53. Which plant absorbs sodium for turgor regulation?
Answer: B) Suaeda
54. Oxygen evolution in photosynthesis involves:
Answer: B) Manganese
55. The pigment essential for nitrogenase protection is:
Answer: B) Leghemoglobin
56. Which is the major form of phosphorus absorbed by plants?
Answer: D) Both B and C
57. Sulphur is required for synthesis of:
Answer: A) Protein
58. Micronutrient needed for synthesis of ascorbic acid is:
Answer: D) Boron
59. The role of potassium is:
Answer: A) Opening of stomata
60. The deficiency symptom of copper is:
Answer: A) Die-back disease
61. The process of reduction of nitrate to ammonia is:
Answer: A) Nitrate assimilation
62. The element essential for synthesis of auxin is:
Answer: B) Zinc
63. Deficiency of calcium in apples leads to:
Answer: A) Bitter pit
64. Which of the following shows a ‘whiptail’ symptom?
Answer: C) Molybdenum
65. Iron deficiency first appears in:
Answer: B) Young leaves
66. Nitrogen is absorbed by plants mainly in the form of:
Answer: C) Nitrate
67. The element which is part of prosthetic group of nitrate reductase:
Answer: C) Molybdenum
68. ‘Crinkle leaf’ in cotton is deficiency of:
Answer: B) Boron
69. Plants compete for:
Answer: D) All above
70. N₂ becomes reduced in presence of:
Answer: D) All above
71. Which ions are actively absorbed by roots?
Answer: D) All above
72. Which element is essential for seed setting?
Answer: C) Boron
73. The mineral deficiency first affecting young leaves is:
Answer: B) Iron
74. Nitrate is finally reduced to:
Answer: B) Ammonia
75. Which micronutrient is essential for pollen tube growth?
Answer: B) Boron
76. ‘Khaira disease’ in rice is due to deficiency of:
Answer: C) Zinc
77. Which transports ammonium ions across membranes?
Answer: C) Ammonium transporters
78. Monocots have higher requirement of:
Answer: D) Potassium
79. The essential macronutrient for nucleic acid formation:
Answer: C) Phosphorus
80. Transamination involves:
Answer: A) Amino group transfer
81. In N₂ fixation, ATP is required for:
Answer: C) Nitrogen reduction
82. Major forms of K+ present in soil:
Answer: D) All above
83. Which is an essential component of cytochromes?
Answer: B) Iron
84. The first formed nitrogenous product of nitrate assimilation is:
Answer: B) Glutamine
85. The ability to fix atmospheric nitrogen is mostly found in:
Answer: B) Blue green algae
86. Which is NOT a plant macronutrient?
Answer: B) Zn
87. Symbiotic N₂ fixer in root nodules of non-legumes:
Answer: A) Frankia
88. S-curves of absorption describe:
Answer: A) Active absorption
89. Phytosiderophores are involved in:
Answer: A) Iron transport
90. Nitrogen deficiency in plants reduces:
Answer: D) All above
91. Denitrification converts:
Answer: A) Nitrate to N₂ gas
92. Which is the primary function of phosphorus in plants?
Answer: A) Component of DNA and ATP
93. ‘Die back’ disease in plants is due to deficiency of:
Answer: A) Copper
94. Young leaves show deficiency of:
Answer: A) Calcium
95. Plants deficient in potassium are:
Answer: A) Small and bushy
96. Most important function of magnesium is:
Answer: B) Chlorophyll formation
97. Amide formation in plants is important for:
Answer: A) Nitrogen transport
98. Which element is most immobile in plants?
Answer: C) Calcium
99. Blue-green algae can fix atmospheric N₂ by means of:
Answer: A) Heterocysts
100. Essential elements take part in:
Answer: D) All above
End of MCQ List.
Paste into WordPress “Custom HTML” block for best formatting.
You may adjust ad slots for your ad account as needed.