For the metamorphosis of tadpoles

Question:

For the metamorphosis of tadpoles which of the following elements must be available in water?

(a) Chlorine

(b) Carbon

(c) Sulphur

(d) Iodine

Solution:

(d) For metamorphosis of tadpoles, iodine should be present in water. This is because metamorphosis is brought about by thyroxine hormone that

requires the presence of iodine for its production by thyroid gland.

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