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SCIENCE CLASS- 9

Class 9 Science Worksheets: Chapter-3

Chapter-wise worksheets with competency-based questions and board exam practice based on the latest CBSE syllabus.

CBSE Latest Syllabus Chapter-wise Worksheets

Worksheet: Tissues in Action


Section 1: The Hierarchy of Life

  1. Define Tissue based on the biological hierarchy of organization.
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  2. Complete the flow chart showing the level of organization in a multicellular organism:
    Cells → ____________ → ____________ → Organ Systems → Organism
  3. Explain the concept of "Division of Labour" in multicellular organisms. Why is it more efficient than a single cell performing all functions?

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Section 2: Plant Tissues – Growth and Support

  1. Meristematic Tissues: Match the following meristems with their specific location/function:
    • Apical Meristem: ________________________________ (Function: Increases length)
    • Lateral Meristem: ________________________________ (Function: Increases girth/diameter)
    • Intercalary Meristem: ________________________________ (Function: Regrowth after grazing)
  2. Experiment Analysis: In an experiment, the root tips of an onion bulb in Jar B were cut. Why did the roots stop growing compared to Jar A? [1, 2]

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  3. The Process of Differentiation: How does a meristematic cell become a permanent tissue?
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  4. Simple Permanent Tissues: Fill in the table below:
    Tissue Type Key Characteristic Main Function
    Parenchyma Living cells, thin walls, loosely packed ________________
    Collenchyma Unevenly thickened corners (pectin) ________________
    Sclerenchyma Thick lignified walls, usually dead ________________

Section 3: Complex Tissues – The Transport System

  1. Why are Xylem and Phloem called Complex Permanent Tissues? [3]
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  2. Xylem vs. Phloem:
    • Which tissue transports water and minerals from roots to leaves? ________________
    • Which tissue consists of sieve tubes and companion cells? ________________
    • Unlike Xylem, Phloem is mostly made up of ____________ (living/dead) cells.

Section 4: Animal Tissues – Protection and Connection

  1. Epithelial Tissue Adaptation: Why is the epithelial tissue lining the lungs very thin and flat (single layer), while the skin has many layers? [4]

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  2. Connective Tissues: Identify the tissue based on the description:
    • Connects Muscle to Bone: ________________
    • Connects Bone to Bone (provides stability): ________________
    • Provides flexibility and cushions ends of bones (found in ear/nose): ________________
    • Fluid tissue transporting nutrients and gases: ________________

Section 5: Movement and Response

  1. Differentiate between Voluntary and Involuntary movements with one example of each.

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  2. Muscular Tissues:
    • Which muscle is branched and never gets tired? ________________
    • Which muscle is spindle-shaped and found in the stomach? ________________
    • Skeletal muscles are multinucleate and show light/dark bands called ____________.
  3. The cells of the nervous tissue are called ____________. Name their three main parts:
    1. ________________ 2. ________________ 3. ________________

Section 6: Expert Inquiry (HOTS)

  1. Scientific Application: F.C. Steward grew an entire carrot plant from a single phloem cell. What is this property of plant cells called? [5]
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  2. Critical Thinking: Why is a thick cuticle an advantage for a desert plant but a disadvantage for an underwater plant? [6]

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  3. Clinical Correlation: If a person suffers a ligament tear in their ankle, which specific function of the musculoskeletal system will be hampered? [7]

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