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

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Administered antithyroid substance like thiourea

Administered large amounts of thyroxine

Reared on a diet rich in egg yolk

Reared on a diet rich in both egg yolk and glucose

answer is A.

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Detailed Solution

Concept- Frogs may undergo a gradual metamorphosis process that involves morphological, physiological, behavioral, and biochemical changes as they transition from a larval state to an adult state.
Thyroxine, a hormone essential for the physiological and biochemical changes that occur during frog metamorphosis, regulates metamorphosis in frogs. The neuroendocrine system is in charge of controlling amphibian metamorphosis. Iodine regulates metabolism and is a crucial component of internal secretions. If iodine levels in the diet are low, the endocrine system may not create enough hormones, disrupting the metamorphosis process.
The egg of an amphibian, which may be enormous, has a moderate amount of yolk, which may be a component of the egg rich in nutrients. Its primary purpose is to manufacture food in the event that the embryo serves as a food reserve.
Hence, the correct answer is 1.

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