Class 10 Biology App (iOS & Android) | Endocrine System Trivia e-Book PDF

Class 10 Biology MCQs (Grade 10) From Textbook

Class 10 Biology MCQs – Certification Test 253

Endocrine System Trivia (Question 253) – App & e-Book Download

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MCQ 253: The substance required for the production of thyroxin hormone is:

  1. vitamin B
  2. vitamin A
  3. iodine
  4. vitaminD

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