Welcome to our ultimate guide on Class 9 Science Chapter 6: Tissues! If you’re a Class 9 student aiming to excel in your 2025 CBSE exams, a parent supporting your child, or a teacher seeking detailed resources, this blog post is your go-to resource. We’ll cover the in-text questions and answers, exercise solutions, and detailed notes for Chapter 6, breaking down the biology of tissues into clear, easy-to-grasp concepts. By the end, you’ll master the types and functions of plant and animal tissues—essential for acing your exams and building a solid Biology foundation!
Chapter 6 explores tissues as groups of cells working together, forming the basis of organs and organisms. From plant growth to animal movement, this chapter connects cells to life’s bigger picture. Let’s dive into the Class 9 Science Chapter 6 questions, answers, and notes!
Why Study Class 9 Science Chapter 6?
Before we begin, let’s understand why this chapter matters. Tissues are the building blocks of organs, enabling specialized functions in plants and animals. This chapter, worth around 25-30 marks in the CBSE Class 9 Science syllabus, is crucial for Biology success. Mastering it in 2025 will boost your exam scores and lay the groundwork for advanced topics in higher classes and exams like NEET.
Let’s break this down into three sections: Notes, In-Text Questions and Answers, and Exercise Solutions.
Class 9 Science Chapter 6 Notes
1. What Are Tissues?
- Definition: A tissue is a group of similar cells performing a specific function.
- Types:
- Plant Tissues: For growth, support, and transport.
- Animal Tissues: For movement, protection, and coordination.
2. Plant Tissues
- Meristematic Tissue:
- Actively dividing cells for growth.
- Types:
- Apical (tips of roots/shoots).
- Lateral (sides, for thickness).
- Intercalary (between nodes).
- Features: Small, thin-walled, dense cytoplasm, no vacuoles.
- Permanent Tissue:
- Mature, non-dividing cells.
- Simple Permanent:
- Parenchyma: Storage, photosynthesis (thin-walled, living).
- Collenchyma: Support in young plants (thickened corners, living).
- Sclerenchyma: Strength (thick-walled, dead).
- Complex Permanent:
- Xylem: Transports water/minerals (tracheids, vessels—dead; parenchyma—living).
- Phloem: Transports food (sieve tubes, companion cells—living; fibers—dead).
3. Animal Tissues
- Epithelial Tissue:
- Covers and protects surfaces (e.g., skin).
- Types:
- Squamous (flat, e.g., lungs).
- Cuboidal (cube-like, e.g., kidney).
- Columnar (tall, e.g., intestine).
- Stratified (layered, e.g., skin).
- Connective Tissue:
- Supports and connects body parts.
- Types:
- Areolar (loose, under skin).
- Adipose (fat storage).
- Bone (hard, support).
- Cartilage (flexible, e.g., ear).
- Blood (fluid, transports O₂, nutrients).
- Muscular Tissue:
- Enables movement.
- Types:
- Skeletal (voluntary, striated, e.g., biceps).
- Smooth (involuntary, non-striated, e.g., intestine).
- Cardiac (involuntary, striated, e.g., heart).
- Nervous Tissue:
- Transmits signals (neurons with axons, dendrites).
- Found in brain, spinal cord, nerves.
4. Key Concepts
- Division of Labor: Tissues specialize for efficiency in multicellular organisms.
- Plant vs. Animal Tissues: Plants have rigid walls and transport tissues; animals have flexible, motile tissues.
These notes summarize the chapter—use them for quick revision!
In-Text Questions and Answers: Page 69
Question 1: What is a tissue?
Answer:
A tissue is a group of similar cells that work together to perform a specific function. For example, muscle tissue in animals contracts for movement, while xylem tissue in plants transports water.
Question 2: What is the utility of tissues in multicellular organisms?
Answer:
In multicellular organisms, tissues enable division of labor, where different groups of cells specialize in tasks like support (bone), transport (blood), or growth (meristem). This improves efficiency and survival.
In-Text Questions and Answers: Page 74
Question 1: Name types of simple tissues.
Answer:
Simple permanent tissues in plants are:
- Parenchyma: Living, thin-walled, for storage and photosynthesis.
- Collenchyma: Living, thickened corners, for support.
- Sclerenchyma: Dead, thick-walled, for strength.
Question 2: Where is apical meristem found?
Answer:
Apical meristem is found at the growing tips of roots and shoots, responsible for increasing the plant’s length.
In-Text Questions and Answers: Page 79
Question 1: What are the constituents of phloem?
Answer:
Phloem consists of:
- Sieve tubes: Conduct food (living, no nucleus).
- Companion cells: Support sieve tubes (living).
- Phloem parenchyma: Storage (living).
- Phloem fibers: Strength (dead).
Question 2: Name the tissue responsible for movement in our body.
Answer:
Muscular tissue is responsible for movement in our body, with types like skeletal (voluntary), smooth (involuntary), and cardiac (heart).
Exercise Questions and Answers: Page 82
Question 1: Define the term “tissue”.
Answer:
A tissue is a group of similar cells with a common origin that work together to perform a specific function, like xylem transporting water or epithelial tissue protecting surfaces.
Question 2: How many types of elements together make up the xylem tissue? Name them.
Answer:
Xylem has four types of elements:
- Tracheids: Dead, water transport.
- Vessels: Dead, wide tubes for water.
- Xylem parenchyma: Living, storage.
- Xylem fibers: Dead, support.
Question 3: Differentiate between parenchyma, collenchyma, and sclerenchyma on the basis of their cell wall.
Answer:
| Tissue | Cell Wall |
|---|---|
| Parenchyma | Thin, flexible, cellulose |
| Collenchyma | Unevenly thickened (corners), cellulose |
| Sclerenchyma | Thick, lignified, rigid |
Question 4: What are the functions of the stomata?
Answer:
Stomata (in plant epidermis):
- Allow gas exchange (O₂ out, CO₂ in) for photosynthesis and respiration.
- Regulate transpiration (water vapor loss).
Question 5: Diagrammatically show the difference between the three types of muscle fibers.
Answer:
(Imagine a diagram with these descriptions):
- Skeletal Muscle: Long, cylindrical, striated, multinucleated.
- Smooth Muscle: Spindle-shaped, non-striated, single nucleus.
- Cardiac Muscle: Branched, striated, single nucleus, intercalated discs.
Additional Exercise Questions
Question 6: What is the specific function of cardiac muscle?
Answer:
Cardiac muscle contracts rhythmically to pump blood throughout the body, working involuntarily and tirelessly in the heart.
Question 7: Differentiate between striated, unstriated, and cardiac muscles on the basis of their structure and site/location in the body.
Answer:
| Muscle Type | Structure | Location |
|---|---|---|
| Striated | Long, cylindrical, striped | Attached to bones |
| Unstriated | Spindle-shaped, no stripes | Walls of organs |
| Cardiac | Branched, striped, discs | Heart |
Question 8: Name the following:
(a) Tissue that forms the inner lining of our mouth.
(b) Tissue that connects muscle to bone in humans.
(c) Tissue that transports food in plants.
(d) Tissue that stores fat in our body.
Answer:
(a) Epithelial tissue (squamous).
(b) Tendon (connective tissue).
(c) Phloem.
(d) Adipose tissue (connective).
Tips to Master Chapter 6
- Learn Tissue Types: Memorize plant and animal tissues with examples.
- Practice Diagrams: Draw meristematic tissues, muscle types, etc.
- Compare Tables: Focus on differences (e.g., parenchyma vs. sclerenchyma).
- Understand Functions: Link tissues to their roles (e.g., xylem—water).
Class 9 Science Chapter 6: Tissues bridges cells to organs, revealing how life functions at a higher level. With these notes, questions, and solutions, you’re set to excel in your 2025 CBSE exams. This chapter blends structure with purpose, making it both fascinating and scoring.
For more practice, check NCERT solutions and sample papers online. Got doubts? Leave them in the comments—we’re here to help! Keep learning and stay curious!
For all Class 9 Science Chapters: Notes and Question Answers. Click Here.
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