50 Most Important NEET PYQs of Chapter 12: Mineral Nutrition – Part 2 (Q26–50)

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🌱 50 Most Important NEET PYQs of Chapter 12: Mineral Nutrition – Part 2 (Q26–50)

By neetpyqall

Welcome to Part 2 of Mineral Nutrition NEET PYQs! This section (Q26–50) continues our handpicked, most frequently asked and important NEET-level questions, complete with explanations for crystal-clear concept clarity.

26. Which of the following is not a function of potassium in plants?

A) Activates enzymes
B) Maintains turgidity
C) Involved in protein synthesis
D) Constituent of amino acids
✅ Answer: D) Constituent of amino acids
Explanation: Potassium plays a role in enzyme activation and osmoregulation, but it is not a structural component of amino acids.

27. Which is the first observable symptom of mineral deficiency?

A) Necrosis
B) Chlorosis
C) Wilting
D) Shortening of internodes
✅ Answer: B) Chlorosis
Explanation: Chlorosis or yellowing is the most common and first visible symptom of mineral deficiency.

28. Which nutrient deficiency leads to curling of leaves?

A) Calcium
B) Boron
C) Iron
D) Potassium
✅ Answer: D) Potassium
Explanation: Potassium deficiency causes margins of leaves to curl and leads to necrosis.

29. Which element is involved in the biosynthesis of cytokinin?

A) Zn
B) B
C) Mo
D) Mn
✅ Answer: A) Zn
Explanation: Zinc is involved in the biosynthesis of growth hormones including cytokinins.

30. Which element is absorbed in both ionic and molecular form?

A) Nitrogen
B) Phosphorus
C) Iron
D) Sulphur
✅ Answer: A) Nitrogen
Explanation: Plants absorb nitrogen as NO₃⁻, NH₄⁺ (ionic), and sometimes as urea (molecular).

31. A plant deficient in nitrogen shows:

A) Anthocyanin accumulation
B) Necrosis
C) Reduced chlorophyll
D) Stunted growth
✅ Answer: C) Reduced chlorophyll
Explanation: Nitrogen deficiency leads to reduced chlorophyll production and chlorosis.

32. Which element is required for the synthesis of ATP?

A) Magnesium
B) Potassium
C) Phosphorus
D) Iron
✅ Answer: C) Phosphorus
Explanation: Phosphorus is a part of ATP, DNA, RNA, and phospholipids.

33. Which mineral helps in photophosphorylation and chlorophyll formation?

A) Zn
B) Mg
C) Fe
D) Mn
✅ Answer: B) Mg
Explanation: Magnesium is the central atom in chlorophyll and activates many enzymes involved in photosynthesis.

34. Which element plays an important role in nitrogen fixation?

A) Mo
B) Mg
C) Ca
D) B
✅ Answer: A) Mo
Explanation: Molybdenum is part of nitrogenase enzyme that catalyzes nitrogen fixation.

35. Which of the following deficiencies causes the rosetting of leaves?

A) B
B) Zn
C) Mo
D) Mn
✅ Answer: B) Zn
Explanation: Zinc deficiency causes rosetting due to shortened internodes.

36. Which mineral is most immobile in plants?

A) Nitrogen
B) Calcium
C) Potassium
D) Phosphorus
✅ Answer: B) Calcium
Explanation: Calcium is relatively immobile; its deficiency appears in young tissues.

37. Which of these causes inhibition of cell elongation?

A) Calcium deficiency
B) Potassium deficiency
C) Boron deficiency
D) Nitrogen deficiency
✅ Answer: A) Calcium deficiency
Explanation: Calcium is essential for cell wall and membrane stability; its deficiency inhibits elongation.

38. Which of the following is not a micronutrient?

A) Iron
B) Copper
C) Zinc
D) Sulphur
✅ Answer: D) Sulphur
Explanation: Sulphur is a macronutrient.

39. Which element is involved in pollen tube growth?

A) Nitrogen
B) Boron
C) Iron
D) Phosphorus
✅ Answer: B) Boron
Explanation: Boron is essential for cell wall formation and pollen tube elongation.

40. Chlorosis is caused by the deficiency of all except:

A) N
B) K
C) Mg
D) Ca
✅ Answer: D) Ca
Explanation: Calcium deficiency leads to meristematic tissue death, not chlorosis.

41. Which mineral deficiency causes browning of leaf tips?

A) Nitrogen
B) Phosphorus
C) Potassium
D) Magnesium
✅ Answer: C) Potassium
Explanation: Potassium deficiency leads to necrosis, especially at leaf tips.

42. Plants absorb phosphorus in the form of:

A) PO₄³⁻
B) HPO₄²⁻ and H₂PO₄⁻
C) HPO₄⁻ only
D) H₃PO₄
✅ Answer: B) HPO₄²⁻ and H₂PO₄⁻
Explanation: These are the primary absorbable forms of phosphorus by plants.

43. Which element is essential for synthesis of nucleic acids?

A) Phosphorus
B) Sulphur
C) Magnesium
D) Potassium
✅ Answer: A) Phosphorus
Explanation: DNA and RNA are composed of phosphate backbones.

44. Which is a function of iron in plants?

A) Constituent of chlorophyll
B) Part of cytochrome system
C) Absorption of water
D) Structural component of protein
✅ Answer: B) Part of cytochrome system
Explanation: Iron is essential in the electron transport chain in mitochondria and chloroplasts.

45. Deficiency of which nutrient causes early leaf fall?

A) Calcium
B) Potassium
C) Phosphorus
D) Boron
✅ Answer: D) Boron
Explanation: Boron deficiency weakens the cell wall and causes premature leaf drop.

46. Which element maintains the anion–cation balance in plant cells?

A) Mg
B) Ca
C) K
D) Fe
✅ Answer: C) K
Explanation: Potassium regulates ionic balance inside plant cells.

47. The element needed for the synthesis of auxins:

A) Boron
B) Copper
C) Zinc
D) Calcium
✅ Answer: C) Zinc
Explanation: Zinc is involved in the synthesis of indole acetic acid (IAA), an auxin.

48. Sulphur is a constituent of:

A) DNA
B) Protein
C) Starch
D) Lipid
✅ Answer: B) Protein
Explanation: Sulphur is found in amino acids like cysteine and methionine.

49. Which deficiency causes 'brown heart disease' in sugar beet?

A) Manganese
B) Zinc
C) Boron
D) Iron
✅ Answer: C) Boron
Explanation: Boron deficiency causes brown heart or hollow heart disease.

50. Which nutrient activates alcohol dehydrogenase enzyme?

A) Manganese
B) Molybdenum
C) Iron
D) Zinc
✅ Answer: D) Zinc
Explanation: Zinc activates several enzymes including alcohol dehydrogenase.

📘 That's a wrap for Chapter 12: Mineral Nutrition NEET PYQs!
Don’t forget to check out all chapters on:
🔗 neetpyqall.blogspot.com
🔗 biologyatease1.blogspot.com


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