Injecting a tadpole with thyroxine would lead to :-a)giant but normal tadpolesb)precocious metamorphosisc)stoppage of metamorphosisd)atrophy of gonadsCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

In frogs, growth and metamorphosis is regulated by Thyroxine gland. Thyroxine is secreted from thyroid gland. It stimulates the consumption of oxygen by metabolically active tissues and also increases the oxidation of glucose in tissues. Hence, tadpoles will undergo metamorphosis if they are injected with thyroxine.

Answer

Thyroxin hormone is responsible for reproduction in frogs therefore answer is B

Answer

Explanation:

Thyroxine is a hormone secreted by the thyroid gland in vertebrates. It plays a vital role in the regulation of metabolism and growth. In amphibians like tadpoles, thyroxine is responsible for initiating and regulating the process of metamorphosis, which is the transformation from a tadpole into an adult frog or toad.

The injection of thyroxine into a tadpole would lead to precocious metamorphosis, which means an early and accelerated transformation into an adult frog. This occurs because thyroxine stimulates the development and differentiation of various organs and tissues during metamorphosis.

Effects of injecting thyroxine into a tadpole:

1. Accelerated development: Thyroxine promotes the growth and differentiation of various organs and tissues in the tadpole. This leads to rapid changes in the body structure and functions, resulting in an accelerated development process.

2. Early metamorphosis: Metamorphosis in tadpoles is a complex process involving the transformation of gills into lungs, development of limbs, and reabsorption of the tail, among other changes. Injecting thyroxine triggers these changes prematurely, causing the tadpole to undergo metamorphosis earlier than normal.

3. Morphological changes: The injection of thyroxine leads to the development of adult characteristics in the tadpole. This includes the growth of limbs, the disappearance of the tail, and the formation of lungs. The tadpole transforms into a miniature version of an adult frog.

4. Functional changes: Along with morphological changes, thyroxine also induces functional changes in the tadpole. For example, the ability to breathe air using lungs instead of gills is developed, allowing the tadpole to live on land as an adult frog.

Conclusion:

Injecting a tadpole with thyroxine would lead to precocious metamorphosis, resulting in an early and accelerated transformation into an adult frog. This occurs due to the effects of thyroxine on the growth, development, and differentiation of various organs and tissues involved in metamorphosis.

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