Thyroidectomised tadpole will metamorphose by administration of

Pituitary extract

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Thyroxine

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TSH

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Iodine

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Solution

The correct option is A Thyroxine
In frogs, growth and metamorphosis (development of frog from tadpole stage to adult stage) 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, a thyroidectomised tadpole (whose thyroid gland has been removed) will metamorphose by administration of thyroxine hormone.
So, the correct answer is 'Thyroxine'.

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