50 Most Important NEET PYQs of Chapter 12: Mineral Nutrition – Part 1 (Q1–25)

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🌿 50 Most Important NEET PYQs of Chapter 12: Mineral Nutrition – Part 1 (Q1–25)

By neetpyqall

Welcome to Part 1 of NEET Previous Year Questions for Chapter 12: Mineral Nutrition. These 25 MCQs have been selected for their relevance and frequency in NEET exams. Each question comes with a detailed solution to boost your understanding and score!

1. Which of the following elements is not essential for plants?

A) Iron
B) Iodine
C) Zinc
D) Manganese
✅ Answer: B) Iodine
Explanation: Iodine is not an essential element for plants, though it is required for animals.

2. Which micronutrient is essential for the photolysis of water?

A) Zn
B) Cu
C) Mn
D) Mo
✅ Answer: C) Mn
Explanation: Manganese is crucial for water splitting in photosystem II during photosynthesis.

3. Which element is a constituent of chlorophyll?

A) Magnesium
B) Iron
C) Zinc
D) Sulphur
✅ Answer: A) Magnesium
Explanation: Mg is centrally located in the chlorophyll molecule.

4. Which nutrient is involved in protein synthesis in plants?

A) Potassium
B) Nitrogen
C) Calcium
D) Sulphur
✅ Answer: B) Nitrogen
Explanation: Nitrogen is an essential component of amino acids and hence proteins.

5. Which deficiency causes interveinal chlorosis in young leaves?

A) Magnesium
B) Sulphur
C) Iron
D) Nitrogen
✅ Answer: C) Iron
Explanation: Iron deficiency leads to chlorosis, especially in younger leaves due to its immobility.

6. Which element activates RuBisCO and PEP carboxylase?

A) Zn
B) K
C) Mg
D) Mn
✅ Answer: C) Mg
Explanation: Magnesium activates both key photosynthetic enzymes.

7. Which of these is a mobile element in plants?

A) Calcium
B) Sulphur
C) Iron
D) Nitrogen
✅ Answer: D) Nitrogen
Explanation: Nitrogen is mobile and moves from older to younger tissues during deficiency.

8. Which is a symptom of phosphorus deficiency?

A) Yellowing of leaves
B) Purplish coloration of leaves
C) Shortening of internodes
D) Browning of leaf tips
✅ Answer: B) Purplish coloration of leaves
Explanation: Due to anthocyanin accumulation under phosphorus deficiency.

9. Which micronutrient is a component of nitrogenase enzyme?

A) Zn
B) Fe
C) Mo
D) Both B and C
✅ Answer: D) Both B and C
Explanation: Nitrogenase contains iron and molybdenum as co-factors.

10. Deficiency of which element causes die-back in plants?

A) Cu
B) Zn
C) Ca
D) K
✅ Answer: A) Cu
Explanation: Copper deficiency results in die-back of shoots and roots.

11. Which essential element is required in the least quantity by plants?

A) Mn
B) Zn
C) Mo
D) Fe
✅ Answer: C) Mo
Explanation: Molybdenum is required in very small quantities but is essential.

12. Which macronutrient is absorbed as a cation?

A) Phosphorus
B) Potassium
C) Nitrogen
D) Sulphur
✅ Answer: B) Potassium
Explanation: K⁺ is absorbed in ionic form by plants.

13. Which element is responsible for maintaining turgidity of cells?

A) Na
B) Ca
C) K
D) Fe
✅ Answer: C) K
Explanation: Potassium regulates osmotic potential, thus maintaining turgor.

14. Yellowing of older leaves is an indication of:

A) Phosphorus deficiency
B) Potassium deficiency
C) Nitrogen deficiency
D) Iron deficiency
✅ Answer: C) Nitrogen deficiency
Explanation: As nitrogen is mobile, older leaves are first affected.

15. Which element is involved in carbohydrate metabolism?

A) Zn
B) B
C) Cu
D) Mo
✅ Answer: A) Zn
Explanation: Zinc activates enzymes involved in carbohydrate metabolism.

16. Which nutrient deficiency is associated with 'whiptail' in cauliflower?

A) Fe
B) Mo
C) B
D) Cu
✅ Answer: B) Mo
Explanation: Molybdenum deficiency causes distorted leaves—'whiptail' in cauliflower.

17. Which of the following is NOT a criterion for essentiality of a mineral nutrient?

A) Deficiency prevents completion of life cycle
B) Irreplaceable by another element
C) Directly involved in metabolism
D) Required in large quantities
✅ Answer: D) Required in large quantities
Explanation: Quantity is not a criterion; even micronutrients are essential.

18. Which of the following is a macronutrient?

A) Manganese
B) Boron
C) Sulphur
D) Copper
✅ Answer: C) Sulphur
Explanation: Sulphur is required in larger amounts, thus a macronutrient.

19. Boron is essential for:

A) Activation of enzymes
B) Pollen germination
C) Chlorophyll synthesis
D) Nitrogen metabolism
✅ Answer: B) Pollen germination
Explanation: Boron plays a key role in reproductive development.

20. Which of these is involved in stomatal regulation?

A) Na⁺
B) K⁺
C) Cl⁻
D) Mg²⁺
✅ Answer: B) K⁺
Explanation: Potassium ions are responsible for the opening and closing of stomata.

21. Which of the following is considered a beneficial element for higher plants?

A) Sodium
B) Molybdenum
C) Selenium
D) Iron
✅ Answer: A) Sodium
Explanation: Sodium is beneficial, especially for C₄ plants like sugar beet.

22. Which plant nutrient is involved in the synthesis of auxin?

A) Copper
B) Boron
C) Zinc
D) Molybdenum
✅ Answer: C) Zinc
Explanation: Zinc is necessary for the synthesis of IAA (Indole Acetic Acid).

23. Necrosis in leaves is caused due to deficiency of:

A) Ca
B) K
C) Mg
D) Cu
✅ Answer: B) K
Explanation: Potassium deficiency causes death of tissues (necrosis).

24. The most abundant element in plants (dry weight) is:

A) N
B) C
C) H
D) O
✅ Answer: B) C
Explanation: Carbon forms the backbone of all organic molecules in plants.

25. Which of the following is essential for cell wall formation?

A) Calcium
B) Potassium
C) Zinc
D) Magnesium
✅ Answer: A) Calcium
Explanation: Calcium is crucial for middle lamella and cell wall stabilization.

📘 Stay tuned for Part 2 (Q26–50) of Mineral Nutrition NEET PYQs!
Get more NEET-targeted biology at:
🔗 neetpyqall.blogspot.com
🔗 biologyatease1.blogspot.com


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