Question

On removing the thyroid from the tadpole, it will
1. die immediately
2. remain a tadpole throughout life
3. grow into a dwarf frog
4. none of the above

Answer 1

Correct Answer - Option 2 : remain a tadpole throughout life

Concept:

• Tadpoles are the young ones of amphibians, particularly of frogs and toads.
• The process by which a tadpole develops into an adult frog is called Metamorphosis.
• A frog lays eggs that become tadpoles in just a few days.
• These tadpoles live underwater

Explanation:

• Hormone thyroxine present in the thyroid gland of the tadpole initiates the process of Metamorphosis.
• Thyroxine hormone is produced by the thyroid gland in the presence of Iodine.
• That’s why Iodine should be available in sufficient quantity in the water of the pond.
• If iodine is not available in the diet, then the thyroid may produce an insufficient hormone which will affect the process of metamorphosis. 
• Thereby, On removing the thyroid from the tadpole, it will remain a tadpole throughout life