Class 9 Science - CBSE
Tissues in Action
The chapter 'Tissues in Action' explores how groups of cells work together to perform specific functions in multicellular organisms. Building on the fundamental unit of life, Class 9 CBSE students dive into plant and animal tissues, understanding the division of labor that enables complex life. You will learn about meristematic and permanent tissues in plants, and epithelial, connective, muscular, and nervous tissues in animals. For board exams, this chapter is crucial as it forms the basis of human physiology and plant anatomy, frequently featuring diagram-based questions and structural comparisons.
Start Learning FreeKey Concepts
Meristematic Tissue
Active dividing tissues located at growing regions of plants like root tips and shoot tips, responsible for plant growth.
Permanent Tissue
Derived from meristematic tissue where cells have lost the ability to divide and have taken up a specific permanent shape and function.
Epithelial Tissue
Protective covering tissue in animals that forms the outer skin and lines internal organs and cavities.
Connective Tissue
Animal tissue that binds, supports, and packages other tissues and organs; examples include blood, bone, and cartilage.
Nervous Tissue
Specialized animal tissue made of neurons that transmits electrical impulses quickly across the body to coordinate responses.
Important Formulas
Board Exam Info
In the CBSE Class 9 Science board-style exams, this chapter typically carries around 6 to 8 marks. Questions frequently include labeling diagrams of plant/animal tissues, distinguishing between parenchyma, collenchyma, and sclerenchyma, and explaining the specific functions of blood or nerve cells.
Frequently Asked Questions
What is the main difference between plant and animal tissues?
Plant tissues mostly provide structural support and contain dead supportive cells since plants are stationary, whereas animal tissues are specialized for locomotion, active movement, and complex sensory processing.
Why is blood considered a type of connective tissue?
Blood connects different body organs by transporting oxygen, nutrients, hormones, and wastes, and it originates from mesoderm just like other connective tissues.
How do meristematic and permanent tissues differ?
Meristematic tissues consist of actively dividing cells with thin walls, while permanent tissues consist of mature cells that have a definite shape and do not divide.
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