NEET Mineral Nutrition PYQs & Practice Questions

10 free NEET Biology questions on Mineral Nutrition, starting with previous year questions (2016–2023). Tap “Show answer” to check each one. No login needed.

Topics: Roles of Essential Elements · Critical Concentration · Mobile vs Immobile Elements · Manganese Toxicity · Nitrification · Biological Nitrogen Fixation - Nitrogenase · Necessity of Essential Nutrients · Macro and Micronutrients · Essential Mineral Elements · Deficiency Symptoms · Nitrogen Fixation · Role of Mineral Elements

1. Q1NEET 2023Role of Micronutrients

   Match List I with List II: A. Iron, B. Zinc, C. Boron, D. Molybdenum. List II: I. Synthesis of auxin, II. Component of nitrate reductase, III. Activator of catalase, IV. Cell elongation and differentiation. Choose the correct answer from the options given below.

   • A. A-II, B-III, C-IV, D-I
   • B. A-III, B-I, C-IV, D-II
   • C. A-II, B-IV, C-I, D-III
   • D. A-III, B-II, C-I, D-IV
   Show answer

   Answer: A — A-II, B-III, C-IV, D-I

   Iron is an activator of catalase (A-III). Zinc is involved in the synthesis of auxin (tryptophan synthesis) (B-I). Boron is required for cell elongation and differentiation (C-IV). Molybdenum is a component of nitrate reductase (D-II). So the correct match is A-III, B-I, C-IV, D-II.

2. Q2NEET 2022Functions of Micronutrients - Matching

   Match List-I with List-II: (a) Manganese (b) Magnesium (c) Boron (d) Iron -- List-II: (i) Activates the enzyme catalase (ii) Required for pollen germination (iii) Activates enzymes of respiration (iv) Functions in splitting of water during photosynthesis. Choose the correct answer from the options given below:

   • A. a-iii, b-iv, c-ii, d-i
   • B. a-iv, b-iii, c-ii, d-i
   • C. a-iv, b-i, c-ii, d-iii
   • D. a-iii, b-i, c-ii, d-iv
   Show answer

   Answer: A — a-iii, b-iv, c-ii, d-i

   Manganese functions in splitting of water during photosynthesis (iv). Magnesium activates enzymes of respiration (iii) (and is part of chlorophyll). Boron is required for pollen germination (ii). Iron activates the enzyme catalase (i). So a-iv, b-iii, c-ii, d-i.

3. Q3NEET 2022Functions of Micronutrients

   Match List-I with List-II List-I: (a) Manganese (b) Magnesium (c) Boron (d) Iron List-II: (i) Activates the enzyme catalase (ii) Required for pollen germination (iii) Activates enzymes of respiration (iv) Functions in splitting of water during photosynthesis Choose the correct answer from the options given below:

   • A. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
   • B. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
   • C. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
   • D. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
   Show answer

   Answer: A — (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

   Manganese functions in splitting water during photosynthesis(iv), Magnesium activates enzymes of respiration(iii), Boron is required for pollen germination(ii), Iron activates catalase(i). So (a)-(iv),(b)-(iii),(c)-(ii),(d)-(i).

4. Q4NEET 2020Functions of essential elements in plants

   Match the following concerning essential elements and their functions in plants: (a) Iron, (b) Zinc, (c) Boron, (d) Manganese with (i) Photolysis of water, (ii) Pollen germination, (iii) Required for chlorophyll biosynthesis, (iv) IAA biosynthesis

   • A. a-ii, b-i, c-iv, d-iii
   • B. a-iv, b-iii, c-ii, d-i
   • C. a-iii, b-iv, c-ii, d-i
   • D. a-iv, b-ii, c-iii, d-i
   Show answer

   Answer: B — a-iv, b-iii, c-ii, d-i

   Iron is required for chlorophyll biosynthesis (iii), Zinc is needed for IAA (auxin) biosynthesis (iv), Boron is important for pollen germination (ii), and Manganese is involved in the photolysis of water (i). This matches a-iii, b-iv, c-ii, d-i.

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5. Q5NEET 2020Nitrogen fixation products via nitrogenase

   The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are:

   • A. Ammonia alone
   • B. Nitrate alone
   • C. Ammonia and oxygen
   • D. Ammonia and hydrogen
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   Answer: C — Ammonia and oxygen

   The nitrogenase enzyme complex catalyses the reduction of atmospheric N2 to ammonia, and this reaction also generates hydrogen gas as a byproduct.

6. Q6NEET 2018Role of essential elements (turgor regulation)

   Which of the following elements is responsible for maintaining turgor in cells?

   • A. Magnesium
   • B. Calcium
   • C. Potassium
   • D. Sodium
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   Answer: B — Calcium

   Potassium plays a key role in maintaining the turgor pressure of cells, regulating osmotic balance and stomatal movement.

7. Q7NEET 2018Forms of iron absorbed by plants

   In which of the following forms is iron absorbed by plants?

   • A. Ferric
   • B. Both ferric and ferrous
   • C. Free element
   • D. Ferrous
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   Answer: A — Ferric

   Plants can absorb iron in both the ferric (Fe3+) and ferrous (Fe2+) forms from the soil, though ferrous iron is generally more readily absorbed.

8. Q8NEET 2016Role of Elements

   Which is essential for the growth of root tip?

   • A. Mn
   • B. Zn
   • C. Fe
   • D. Ca
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   Answer: C — Fe

   Calcium (Ca) is essential for meristematic growth, especially of root tips, as it is required for cell wall synthesis and membrane function.

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9. Q9Essential Mineral Elements

   Which of the following criteria is NOT used to determine whether a mineral element is essential for a plant?

   • A. The plant must be unable to complete its life cycle without the element
   • B. The element must be directly involved in plant metabolism
   • C. The element must be present in large quantities in the soil
   • D. The requirement for the element must be specific and not replaceable by another element
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   Answer: B — The element must be directly involved in plant metabolism

   Arnon and Stout (1939) proposed three criteria for essentiality: (1) the plant cannot complete its life cycle without it, (2) its requirement must be specific and not replaceable, and (3) it must be directly involved in plant metabolism. The quantity present in soil is irrelevant to its essentiality.

10. Q10Macro and Micronutrients

    Which of the following is classified as a macronutrient in plants?

    • A. Zinc
    • B. Manganese
    • C. Magnesium
    • D. Copper
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    Answer: B — Manganese

    Magnesium (Mg) is a macronutrient required by plants in relatively large amounts (>10 mmole/kg of dry matter). Zinc, Manganese, and Copper are micronutrients required in trace amounts (<10 mmole/kg of dry matter).