Tissues
Uttar Pradesh Board · Class 9 · Science
Quick revision notes for Tissues — Uttar Pradesh Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Introduction to Tissues
- A tissue is a group of cells similar in structure and function that work together
- Multicellular organisms show division of labour - different cells perform different functions
- Examples: Blood (transport), muscle (movement), nerve cells (message transmission)
Plant Tissues - Meristematic Tissue
- Meristematic tissue consists of actively dividing cells
- Located only at specific regions where growth occurs
- Three types: Apical (tips), Lateral (cambium), Intercalary (nodes)
Plant Tissues - Simple Permanent Tissue
- Formed from meristematic tissue after losing ability to divide
- Process called differentiation leads to specialized functions
- Three types: Parenchyma, Collenchyma, Sclerenchyma
Plant Tissues - Epidermis and Cork
- Epidermis: outermost protective layer, usually single-celled
- Has waxy cuticle to prevent water loss
- Stomata: pores for gas exchange, controlled by guard cells
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