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Tadpoles of Frog can be made to grow as ...

Tadpoles of Frog can be made to grow as giant sized tadpoles, if they are

A

Administered large amount of thyroxine

B

Administered antithyroid substance like thiourea

C

Reared on a diet rich in egg yolk

D

Reared on a diet rich in egg yolk

Text Solution

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The correct Answer is:
To answer the question "Tadpoles of Frog can be made to grow as giant sized tadpoles, if they are...", we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Tadpole Development**: - Tadpoles are the larval stage of frogs. They undergo metamorphosis to become adult frogs. 2. **Role of Thyroid Hormones**: - The growth and metamorphosis of tadpoles are regulated by thyroid hormones, particularly thyroxine. This hormone is influenced by iodine levels in the body. 3. **Effect of Iodine on Metamorphosis**: - Iodine is essential for the production of thyroxine. When iodine levels are adequate, thyroxine promotes the normal metamorphosis of tadpoles into frogs. 4. **Inducing Giant Size**: - To make tadpoles grow larger without undergoing normal metamorphosis, we need to alter the thyroid hormone activity. This can be achieved by manipulating iodine levels. 5. **Using Antithyroid Substances**: - Administering an antithyroid substance, such as thiouracil, can inhibit the production of thyroxine. This inhibition prevents normal metamorphosis, allowing the tadpoles to continue growing larger without transforming into frogs. 6. **Conclusion**: - Therefore, tadpoles can be made to grow as giant-sized tadpoles if they are administered antithyroid substances like thiouracil, which blocks the action of iodine and thyroxine, preventing metamorphosis. ### Final Answer: Tadpoles of Frog can be made to grow as giant sized tadpoles if they are administered antithyroid substances like thiouracil.
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