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Class 9 Biology MCQs (Grade 9) From Textbook

Class 9 Biology MCQs – Certification Test 183

Cellular Structures and Functions MCQ (Question 183) – Study App & e-Book Download

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MCQ 183: The common chemical of secondary walls of xylem cells is:

  1. amino acids
  2. peptidoglycan
  3. chitin
  4. lignin

Class 9 Biology MCQ App & e-Book – Cellular Structures and Functions Admission Tests

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