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Reaching the Age of Adolescence — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceReaching the Age of Adolescence2 Marks
Question
A tadpole is kept in iodine deficient water. How will it affect its growth ? Explain.
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Answer

Tadpoles growing in iodine deficient water have retarded growth. This is because the growth and development is regulated by thyroxine hormone which is produced by thyroid gland.
As iodine is required for thyroxine production, retarded growth is seen in tadpoles when kept in iodine deficient water.

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