📘 Class 9 Science (Exploration) – Chapter 3: Tissues in Action
⭐ FACT SHEET (Only Important Facts – No Definitions, No Differences)
🌱 General Facts
Tissues are found only in multicellular organisms.
Division of labour increases the efficiency of multicellular organisms.
Cells with similar structure and function form a tissue.
Tissues combine to form organs.
🌿 Meristematic Tissue Facts
Meristematic cells actively divide throughout life.
They have thin cell walls.
They have a large nucleus.
They contain dense cytoplasm.
Vacuoles are absent or very small.
Intercellular spaces are absent.
Responsible for the growth of plants.
Locations
Apical Meristem → Root and shoot tips
Intercalary Meristem → Base of leaves and internodes
Lateral Meristem (Cambium) → Increases thickness of stem and root
🌳 Permanent Tissue Facts
Formed from meristematic tissue.
Cells become specialized.
Usually have large vacuoles.
May have intercellular spaces.
Perform specific functions instead of growth.
🌾 Parenchyma Facts
Most common plant tissue.
Cells are living.
Stores food and water.
Heals wounds in plants.
Chlorenchyma contains chloroplasts and performs photosynthesis.
Aerenchyma contains air spaces and helps aquatic plants float.
🌿 Collenchyma Facts
Cells are living.
Cell walls are unevenly thickened at the corners.
Gives flexible support.
Found in leaf stalks and young stems.
Allows bending without breaking.
🌰 Sclerenchyma Facts
Cells are dead at maturity.
Walls contain lignin.
Provides mechanical strength.
Makes plant parts hard.
Found in coconut husk, nutshells, and seed coats.
💧 Xylem Facts
Conducts water and minerals.
Movement is mainly upward.
Provides support to plants.
Most xylem cells are dead.
Xylem parenchyma is the only living element.
🍃 Phloem Facts
⭐ FACT SHEET (Only Important Facts – No Definitions, No Differences)
🌱 General Facts
Tissues are found only in multicellular organisms.
Division of labour increases the efficiency of multicellular organisms.
Cells with similar structure and function form a tissue.
Tissues combine to form organs.
🌿 Meristematic Tissue Facts
Meristematic cells actively divide throughout life.
They have thin cell walls.
They have a large nucleus.
They contain dense cytoplasm.
Vacuoles are absent or very small.
Intercellular spaces are absent.
Responsible for the growth of plants.
Locations
Apical Meristem → Root and shoot tips
Intercalary Meristem → Base of leaves and internodes
Lateral Meristem (Cambium) → Increases thickness of stem and root
🌳 Permanent Tissue Facts
Formed from meristematic tissue.
Cells become specialized.
Usually have large vacuoles.
May have intercellular spaces.
Perform specific functions instead of growth.
🌾 Parenchyma Facts
Most common plant tissue.
Cells are living.
Stores food and water.
Heals wounds in plants.
Chlorenchyma contains chloroplasts and performs photosynthesis.
Aerenchyma contains air spaces and helps aquatic plants float.
🌿 Collenchyma Facts
Cells are living.
Cell walls are unevenly thickened at the corners.
Gives flexible support.
Found in leaf stalks and young stems.
Allows bending without breaking.
🌰 Sclerenchyma Facts
Cells are dead at maturity.
Walls contain lignin.
Provides mechanical strength.
Makes plant parts hard.
Found in coconut husk, nutshells, and seed coats.
💧 Xylem Facts
Conducts water and minerals.
Movement is mainly upward.
Provides support to plants.
Most xylem cells are dead.
Xylem parenchyma is the only living element.
🍃 Phloem Facts
