Match List - I with List - II.

  List - I    List - II
(a) Manganese (i)  Activates the enzyme catalase
(b) Magnesium (ii) Required for pollen germination
(c) Boron (iii) Activates enzymes of respiration
(d) Iron (iv) Functions in splitting of water during photosynthesis

Choose the correct answer from the options given below:

  1. (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
  2. (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
  3. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
  4. (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

Answer (Detailed Solution Below)

Option 3 : (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
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CT 1: Botany (Cell:The Unit of Life)
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Detailed Solution

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Concept:

  • Nutrients are generally present in plant tissues in large amounts (in excess of 10 mmole Kg –1 of dry matter) and are called macronutrients.
  • Examples of macronutrients include carbon, hydrogen, oxygen, nitrogen, phosphorous, sulfur, potassium, calcium, and magnesium. 
  • Trace elements, that are needed in very small amounts (less than 10 mmole Kg –1 of dry matter) are called micronutrients.
  • Examples of micronutrients are iron, manganese, copper, molybdenum, zinc, boron, chlorine, and nickel.

Explanation:

  • Manganese plays a major role in the splitting of water to liberate oxygen during photosynthesis.
  • Magnesium activates several enzymes involved in photosynthesis and respiration.
  • Boron is involved in pollen germination.
  • Iron activates catalase and some other enzymes.

Therefore, the correct answer is option 3.

Additional information:

  • Magnesium is a constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.
  • Iron is an important constituent of proteins involved in the transfer of electrons like ferredoxin and cytochromes. It is reversibly oxidized from Fe2+ to Fe3+ during electron transfer.
  • Boron also helps in cell elongation, cell differentiation, and carbohydrate translocation.
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