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PUCET (Punjab) Mineral Nutrition — practice questions

Explore 3 free Mineral Nutrition questions in PUCET (Punjab) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Mineral Nutrition questions and exercises with answers

Showing questions 1–3 of 3.

**Macronutrients** (required in large quantities) for plants include:Read the answer and worked solution →Which mineral is needed for **chlorophyll synthesis**?Read the answer and worked solution →Which element is a constituent of **nitrogenase enzyme** (catalyses biological N₂ fixation)?Read the answer and worked solution →

Worked practice questions

**Macronutrients** (required in large quantities) for plants include:

  1. Cu, Zn, B, Mn
  2. C, H, O, N, P, S, Mg, K, Ca
  3. Only Mg and Fe
  4. Only C, H, O
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Correct answer: B. C, H, O, N, P, S, Mg, K, Ca

Macronutrients (>10 mmol/kg of dry matter): C, H, O, N, P, S, K, Ca, Mg. **Micronutrients (trace):** Cu, Zn, B, Mn, Mo, Fe, Cl, Ni. Both essential but in different quantities.

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Which mineral is needed for **chlorophyll synthesis**?

  1. Calcium
  2. Magnesium (central atom of chlorophyll porphyrin ring)
  3. Sulphur
  4. Sodium
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Correct answer: B. Magnesium (central atom of chlorophyll porphyrin ring)

Mg²⁺ sits at the centre of every chlorophyll molecule's porphyrin ring. Mg deficiency → chlorosis (yellowing of older leaves). Mg also activates many enzymes (RuBisCO, ATPases).

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Which element is a constituent of **nitrogenase enzyme** (catalyses biological N₂ fixation)?

  1. Calcium
  2. Molybdenum (and iron) — Mo–Fe cofactor
  3. Sodium
  4. Silicon
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Correct answer: B. Molybdenum (and iron) — Mo–Fe cofactor

Nitrogenase has a complex iron–molybdenum cofactor (FeMoCo). Mo and Fe are essential micronutrients their deficiency cripples N fixation in legumes/Rhizobium. Plants of pulses and free-living N-fixers like Azotobacter need Mo.

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