Iodine is necessary for the synthesis of which hormone ?

Question

Accepted Answer

Iodine is necessary for the synthesis of the hormone thyroxin, which is produced by the thyroid gland. Thyroxin, also known as T4, is a crucial hormone that regulates metabolism, growth, and development in the body. Iodine is an essential component of thyroxin, and without sufficient iodine, the thyroid gland cannot produce adequate levels of this hormone, leading to conditions such as goiter and hypothyroidism.

Now, let's explain why the other options are incorrect:

1. **Auxin**: Auxin is a plant hormone that plays a role in the regulation of plant growth and development, including cell elongation and differentiation. Iodine is not involved in the synthesis of auxin, as it is specific to plant biology and does not require iodine.

2. **Insulin**: Insulin is a hormone produced by the pancreas that regulates blood glucose levels. It is composed of amino acids and does not require iodine for its synthesis. Therefore, iodine is not necessary for the production of insulin.

3. **Adrenalin**: Adrenalin, also known as epinephrine, is a hormone produced by the adrenal glands. It is involved in the body's fight-or-flight response and is synthesized from the amino acid tyrosine. Iodine is not a component of adrenalin, so it is not needed for its synthesis.

In summary, iodine is specifically required for the synthesis of thyroxin, making Option 3 the correct answer. The other options do not involve iodine in their synthesis processes.