Class 9 Biology MCQs (Grade 9) From Textbook

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Class 9 Biology MCQs – Certification Test 497

Functions of Nitrogen and Magnesium Trivia (Question 497) – App & e-Book Download

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MCQ: 497

The structural component of chlorophyll is

  1. magnesium
  2. potassium
  3. calcium nitrate
  4. calcium phosphate
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Functions of Nitrogen and Magnesium Study Guide – Class 9 Biology App & e-Book Trivia

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