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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

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

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