Which one of the following nutrients is concerned with the growth of the plants in view of their role in synthesis of auxin - [AIPMT 2003]a)Sb)Mnc)Znd)KCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Zinc is an essential micronutrient required for the growth and development of plants. It is involved in the synthesis of indoleacetic acid (IAA), which is a natural auxin.

The function of zinc is to activate the enzyme tryptophan synthetase which is responsible for auxin biosynthesis from tryptophan.

Answer

Zinc-deficient soils causing hidden deficiency may remain undetected for many years unless soil or plant … farming methods may lead to the development of a more severe deficiency in the crop … more as a result of hidden zincdeficiency can have an economic impact on the farmer

Answer

Tryptophan is precursor of Auxin/IAA and Zn is the mineral required for tryptophan synthesis.
Hence option C will be the correct answer

Answer

Zn..... is precursor for Auxin

Answer

Role of Nutrients in Plant Growth
Plants require various nutrients for growth, and each nutrient plays a specific role in physiological processes. Among these, zinc (Zn) is particularly significant in the synthesis of auxins, which are vital plant hormones.
Importance of Auxins
- Auxins are crucial for:
- Cell elongation
- Apical dominance
- Root formation
- Fruit development
Zinc’s Function
- Zinc acts as a cofactor for several enzymes involved in:
- Protein synthesis
- Nucleic acid metabolism
- It is essential for the synthesis of auxins, particularly indole-3-acetic acid (IAA), which is the primary auxin in plants.
Consequences of Zinc Deficiency
- A deficiency in zinc can lead to:
- Stunted growth
- Poor root development
- Distorted leaf shapes
- These effects are primarily due to reduced auxin production.
Comparison with Other Nutrients
- Sulfur (S): Important for amino acids and proteins but not directly involved in auxin synthesis.
- Manganese (Mn): Involved in photosynthesis and enzyme activation but does not play a direct role in auxin production.
- Potassium (K): Essential for osmoregulation and enzyme activation but again, not directly tied to auxin synthesis.
Conclusion
In summary, zinc (Zn) is the nutrient that is specifically concerned with the growth of plants due to its critical role in the synthesis of auxins. This makes it essential for various growth processes and overall plant health.

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