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CBSE Class 9 Science Question 13 of 15

Tissues — Question 14

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Question 14

How does the cork act as a protective tissue?

Answer

A strip of secondary meristem located in the cortex forms layers of cells which constitute the cork. Cells of cork are dead and compactly arranged without intercellular spaces. They also have a substance called suberin in their walls that makes them impervious to gases and water. This is how cork act as a protective tissue protecting the plants from any physical or mechanical injuries and pathogenic infection.

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Science | Chapter 6: TissuesWeb Content — Quick Reference

Chapter 6: Tissues — Quick Reference

meristematic tissue permanent tissue epithelial connective muscular nervous xylem phloem neuron

Quick Revision Points

  • Meristematic: actively dividing (apical, lateral, intercalary)
  • Parenchyma (thin, living, storage), Collenchyma (corner-thickened, flexibility), Sclerenchyma (thick, dead, strength)
  • Xylem: water transport upward (mostly dead). Phloem: food transport (mostly living)
  • Epithelial: squamous, cuboidal, columnar, ciliated, glandular
  • Connective: blood, bone, cartilage, tendon (muscle-bone), ligament (bone-bone), areolar, adipose
  • Muscular: striated (voluntary), smooth (involuntary), cardiac (involuntary, never tires)
  • Nervous: neuron = cell body + dendrites + axon; transmits electrical impulses
Exam Tips for Chapter 6
  • Read the detailed chapter notes for complete coverage of all NCERT topics.
  • Practice all NCERT in-text and back exercise questions — they are frequently asked in exams.
  • Focus on comparison tables, diagrams, and definitions — these are high-scoring areas.
  • For numericals (if applicable), practice at least 20 problems of varying difficulty.
  • Refer to the practice question bank (200+ questions) for thorough preparation.
Related Resources
  • Detailed Notes: ch06-tissues.html
  • Practice Questions: 100+ questions with answers in 05-practice-questions/
  • Chapter Test: 30-mark test paper in 06-tests/chapter-tests-30marks/
  • Formula Sheet: Complete formula reference in 03-teacher-aid/formula-sheet.html
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