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CBSE • Class 9 • Science • Ch 6
Estimated Time: 45 Mins
Study Progress: In Progress

Tissues

In Class 9 Science, "Tissues" provides an authoritative, curriculum-verified master resource aligned with the 2026–27 NCERT syllabus.

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Overview Core Concepts Summary Self Check Take MCQ Test

🧬 Have You Ever Wondered?

How do millions of individual microscopic cells organize themselves into beating heart muscle, rigid bone, or sap-transporting plant veins? A tissue i...

How do millions of individual microscopic cells organize themselves into beating heart muscle, rigid bone, or sap-transporting plant veins? A tissue is a cooperative team of similar cells performing a specialized function.

Why This Chapter Matters

In Class 9 Science, "Tissues" provides an authoritative, curriculum-verified master resource aligned with the 2026–27 NCERT syllabus.

Before You Begin (Prerequisites)

  • Cells as units of life from Chapter 5.
  • Organs and organ systems.
  • Photosynthesis and plant transport.

What You Will Learn (Core Objectives)

  • Define Tissue and explain division of labor in multicellular organisms.
  • Classify Plant Tissues: Meristematic (Apical, Lateral, Intercalary) and Permanent (Simple: Parenchyma, Collenchyma, Sclerenchyma; Complex: Xylem, Phloem).
  • Classify Animal Tissues: Epithelial, Connective, Muscular, and Nervous.
  • Describe the structure of a Neuron (Cell body, Dendrites, Axon).
  • Explain the composition and functions of blood as a fluid connective tissue.

Chapter Roadmap & Progression

1 1. Plant Tissues: Growth & Support
2 2. Animal Tissues: Structure & Comm...

Complete Concept Guide (100% Curriculum Coverage)

1. Plant Tissues: Growth & Support

  • Meristematic Tissues: Actively dividing growth cells: Apical (tips of roots/stems for length), Lateral (cambium for girth/thickness), Intercalary (base of nodes).
  • Simple Permanent: Parenchyma (thin-walled storage/packing cells; Chlorenchyma performs photosynthesis; Aerenchyma provides buoyancy), Collenchyma (flexible corners allowing bending without breaking), Sclerenchyma (dead, thick lignified walls giving hardness, e.g. coconut husk).
  • Complex Vascular: Xylem (conducts water upward) and Phloem (translocates food bidirectionally).

2. Animal Tissues: Structure & Communication

  • Epithelial: Protective barrier sheets (skin, lung alveoli lining).
  • Connective: Binds organs together: Blood (liquid matrix plasma transporting gases/nutrients), Bone (calcium-hardened matrix), Cartilage, Ligament (connects bone to bone), Tendon (connects muscle to bone).
  • Muscular: Contractile fibers: Striated (voluntary), Smooth (involuntary), Cardiac (involuntary rhythmic heart muscle).
  • Nervous: Neurons transmitting electrical nerve impulses via dendrites and axons.

Visual Learning & Conceptual Map

Tissues Master Matrix

Conceptual framework, core mechanisms, and analytical relationships
Academic Architecture

1. Plant Tissues: Growth & Support • 2. Animal Tissues: Structure & Communication

Chapter Summary & 10 Key Takeaways

Takeaway 1
Tissue: Group of similar cells specialized for a specific physiological function.
Takeaway 2
Meristems: Regions of active cell division (Apical=length, Lateral=girth).
Takeaway 3
Sclerenchyma: Dead lignified cells providing mechanical rigidity (coconut husk).
Takeaway 4
Connective Tissues: Bone, cartilage, tendons (muscle-bone), ligaments (bone-bone), blood.
Takeaway 5
Neuron: Structural unit of nervous tissue composed of cyton, dendrites, and axon.

Check Your Understanding (Diagnostic Practice Questions)

Diagnostic questions testing core conceptual clarity. Answers are hidden initially — solve each problem first, then click to reveal the step-by-step verified solution.

1
Distinguish between a Tendon and a Ligament.
Reveal Answer & Explanation
Answer: A Tendon connects a skeletal muscle to a bone (tough and fibrous with limited flexibility); a Ligament connects a bone to another bone (very elastic with high strength).
Tendon=muscle to bone; Ligament=bone to bone.
2
Which plant tissue makes the husk of a coconut hard and stiff?
Reveal Answer & Explanation
Answer: Sclerenchyma tissue, composed of dead cells with heavily thickened, lignified cell walls.
Sclerenchyma with lignin.
3
Draw and describe the three parts of a Nerve Cell (Neuron).
Reveal Answer & Explanation
Answer: A neuron consists of: (1) Cyton (Cell Body) containing the nucleus, (2) Dendrites (short branched projections receiving impulses), and (3) Axon (a long slender fiber transmitting electrical signals away).
Cell body, dendrites, axon.
4
Why is blood classified as a connective tissue?
Reveal Answer & Explanation
Answer: Because it has an extracellular fluid matrix (plasma) in which red blood cells, white blood cells, and platelets are suspended, connecting and serving all organs of the body.
Fluid plasma matrix connecting organs.
5
What is the function of stomata and which cells regulate them?
Reveal Answer & Explanation
Answer: Stomata facilitate gaseous exchange ($\text{CO}_2$ and $\text{O}_2$) and transpiration of water vapor; their opening and closing is regulated by a pair of kidney-shaped Guard Cells.
Gas exchange and guard cells.
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