What happens when the tadpole larva is kept in iodine deficient pond water ?

Options

A. Development of giant frog
B. Accelerated metamorphosis
C. inhibition of metamorphosis
D. Development of miniature frog

Answer

### Step-by-Step Solution:

1. **Understanding the Context**: The question asks about the effects of iodine deficiency on tadpole larvae, which are the larval stage of frogs, an amphibian species.

2. **Role of Thyroxine**: Thyroxine (T4) is a hormone essential for growth and development in amphibians. It is synthesized from the amino acid tyrosine and requires iodine for its production.

3. **Impact of Iodine Deficiency**: If the pond water is iodine deficient, the tadpole larvae will not be able to produce sufficient amounts of thyroxine. This lack of thyroxine will hinder the normal growth and development processes.

4. **Metamorphosis Process**: Metamorphosis is the biological process through which tadpoles develop into adult frogs. This process is heavily reliant on the presence of thyroxine.

5. **Conclusion**: Due to the lack of iodine, the tadpole larvae will be unable to undergo metamorphosis, leading to a condition where they do not develop into adult frogs. This is referred to as "inhibition of metamorphosis."

6. **Final Answer**: The correct answer to the question is **inhibition of metamorphosis**.