Topics
Laws of Motion
- Force and Motion
- Distance and Displacement
- Speed and Velocity
- Effect of Speed and Direction on Velocity
- Uniform and Non-uniform Motion
- Acceleration and Retardation
- Types of Acceleration
- Graphical Representation of Motion
- Displacement - Time Graph Or Distance - Time Graph
- Velocity - Time Graphs
- Equations of Motion by Graphical Method
- Derivation of Velocity - Time Relation by Graphical Method
- Derivation of Displacement - Time Relation by Graphical Method
- Derivation of Displacement - Velocity Relation by Graphical Method
- Uniform Circular Motion (UCM)
- Newton’s Laws of Motion
- Newton's First Law of Motion
- Newton’s Second Law of Motion
- Newton's Third Law of Motion
- Conservation of Linear Momentum and Its Principle
Work and Energy
Current Electricity
- Electricity
- Potential and Potential Difference
- Free Electrons
- Electric Current
- Ohm's Law
- Resistance and Resistivity of a Conductor
- Electric Circuit
- Symbols and Functions of Various Components of an Electric Circuits
- Electrical Conduction in Solids
- Experimental Verification of Ohm’s Law
- Resistance of a System of Resistors
- Resistors in Series
- Resistors in Parallel
- Domestic Electrical Connections
- Precautions to Be Taken While Using Electricity
Measurement of Matter
- Laws of Chemical Combination
- Law of Conservation of Matter (Law of Conservation of Mass)
- Law of Constant Proportions (Law of Definite Proportions)
- Atoms: Building Blocks of Matter
- Atomic Mass
- Symbols Used to Represent Atoms of Different Elements
- Molecules of Elements and Compounds
- Molecular Mass
- Mole Concept
- Avogadro's Number
- Periodic Trends in the Modern Periodic Table
- Variable Valency
- Ions (Radicals) and Its Types
- Chemical Formulae of Compounds
Acids, Bases and Salts
- Concept of Acid, Base, and Salt
- Ionic Compounds
- Dissociation of Ionic Compounds
- Arrhenius Theory of Acids and Bases
- Basicity and Acidity
- Ph of Solution
- Indicators
- Neutralization Reaction
- Reactions of Acids
- Reactions of Bases
- Salts
- Classification of Salts
- Water of Crystallization
- Electrolysis
- Electrolysis of Water
Classification of Plants
- Classification of Living Organisms
- Classification of Kingdom Plantae
- Basis for Classification of Plants
- Cryptogams
- Cryptogams > Division I- Thallophyta
- Cryptogams > Division II- Bryophytes
- Cryptogams > Division III- Pteridophytes
- Phanerogams
- Phanerogams > Division I-Gymnosperms
- Phanerogams > Division II- Angiosperms
Energy Flow in an Ecosystem
Useful and Harmful Microbes
Environmental Management
- Weather and Climate
- Importance of Weather in the Living World
- Meteorology
- India Meteorological Department
- Solid Waste Management
- Waste and Its Categories
- Waste
- Harmful effects of solid waste
- Necessity of Solid Waste Management
- 7 Principles of Solid Waste Management
- Period Required for Degradation of Waste
- Disaster Management
- First Aid and Emergency Action
- Methods of Transporting Victims/Patients Safely
Information Communication Technology
- What is Information and Communication Technology ?
- Introduction to Computer
- Parts of Computer and Its Functions
- Architecture of Computer
- Computer Hardware and Software
- Microsoft Word
- Microsoft Excel
- Microsoft Powerpoint
- Applications of Technology in Science
- Opportunities in the field of computers
Reflection of Light
- Introduction to Light
- Mirrors
- Plane Mirror
- Spherical Mirrors
- Spherical Mirror > Concave Mirror
- Spherical Mirror > Convex Mirror
- Fundamental Terms Related to Spherical Mirrors
- Rules for Drawing Ray Diagrams
- Image Formation by Concave Mirror
- Image Formation by Convex Mirror
- Divergence and Convergence of Light
- Sign Convention
- Mirror Equation/Formula
- Linear Magnification by Spherical Mirrors
Study of Sound
Carbon : An Important Element
- Carbon: A Versatile Element
- Straight chains, Branched chains, and Rings of Carbon atoms
- Allotropes of Carbon > Diamond
- Allotropes of Carbon > Diamond
- Allotropes of Carbon > Graphite
- Allotropes of Carbon > Fullerene
- Non-crystalline/Amorphous Forms: Coal
- Non-crystalline/Amorphous Forms: Charcoal
- Hydrocarbons
- Non-crystalline/Amorphous Forms: Coke
- Solubility of Carbon
- Reaction of Carbon
- Carbon Dioxide
- Fire Extinguisher
- Methane
- Biogas Plant
Substances in Common Use
- Important Salts in Daily Life
- Properties and Uses of Sodium Chloride
- Preparation and Uses of Baking Soda
- Preparation and Uses of Bleaching Powder
- Preparation and Uses of Washing Soda
- Some Crystalline Salts
- Soap
- Radioactivity
- Nature of Radioactive Radiation
- Characteristics of Alpha, Beta and Gamma Rays
- Uses of Radioactive Isotopes
- Harmful Effects of Radiation
- Chemical Substances in Day to Day Life
- Food Colours and Essences
- Dye
- Artificial Colours
- Deodorant
- Teflon
- Powder Coating
- Anodizing
- Ceramic
Life Processes in Living Organisms
- Transportation in Living Organisms
- Transportation in Plants
- Transportation of Water
- Transportation of Food and Other Substances
- Excretion
- Excretion in Plants
- Human Excretory System
- Dialysis and Artificial Kidney
- Control and Co-ordination
- Control and Co-ordination in Plants
- Control and Co-ordination in Human Being
- Nervous Control
- Human Nervous System
- Central Nervous System (CNS)
- Peripheral Nervous System > Somatic Nervous System
- Peripheral Nervous System > Autonomic Nervous System
- Chemical Control
- Endocrine Glands: Location and Important Functions
Heredity and Variation
- Heredity
- Inherited Traits and Expression of Traits
- Chromosomes - The Carriers of Heredity
- Types of Chromosomes
- Deoxyribonucleic Acid (DNA)
- Ribonucleic acid (RNA)
- Gregor Johann Mendel – Father of Genetics
- Monohybrid Cross
- Dihybrid Cross
- Human Genetic Disorders
- Diseases Occuring Due to Mutation in Single Gene (Monogenic Disorders)
- Mitochondrial Disorder
- Disorders Due to Mutations in Multiple Genes : (Polygenic Disorders)
Introduction to Biotechnology
- Tissues - “The Teams of Workers”
- Animal Tissues
- Epithelial Tissue
- Connective Tissue
- Muscular Tissue
- Nervous Tissue
- Plant Tissues
- Meristems or Meristematic Tissues
- Permanent Tissue
- Simple Permanent Tissues (Supporting Tissue)
- Complex Permanent Tissues
- Biotechnology
- Tissue Culture
- Changes in Agricultural Management Due to Biotechnology
- Application of Biotechnology in Floriculture, Nurseries and Forestry
- Agritourism
- Animal Husbandry (Livestock)
- Poultry Farm Management
- Sericulture
Observing Space : Telescopes
- Introduction
- Effects of Fungi
- Preventive Measures
Maharashtra State Board: Class 9
Introduction:
Fungi are microorganisms that reproduce through microscopic spores present in the air. These spores settle and germinate in the presence of sufficient moisture, leading to fungal growth on a variety of surfaces and materials. Fungal hyphae, which are thread-like structures, penetrate deeply into these materials to extract nutrients and reproduce. This activity not only causes visible damage but also weakens the affected items over time.
Maharashtra State Board: Class 9
Effects of Fungi
Effects of Fungi on Materials:
Fungi commonly grow on cotton fabric, gunny bags, leather, and wooden items.
- Leather items such as shoes, belts, purses, and other products are especially vulnerable to fungal damage.
- Fungal hyphae penetrate deeply into these materials, weakening their structure. As a result, the materials become worn out, fragile, and unusable over time.
- Wooden items are also susceptible to fungal decay, which reduces their durability and lifespan.
Effects of Fungi on Food:
Fungi grow on food items like pickles, murabba, jam, sauce, chutney, and other moist, nutrient-rich products.
- During growth and reproduction, fungi release mycotoxins, which are toxic chemicals that contaminate the food. These mycotoxins can cause food poisoning and pose serious health risks if consumed.
- Fungi use the nutrients in food for their growth, making the food inedible. Food contaminated with fungi should never be consumed, as it can lead to illnesses such as vomiting, diarrhoea, and long-term health problems.
Maharashtra State Board: Class 9
Preventive Measures:
- Proper storage is essential to keep materials and food items in a dry and well-ventilated environment, preventing fungal growth.
- It is crucial to use airtight containers to store food products that are prone to fungal contamination.
- Regular cleaning of leather and wooden items is necessary to remove moisture and prevent fungal spores from settling.
- Contaminated items showing visible fungal growth should always be discarded to avoid health risks or further spread of fungi.
- Wooden surfaces must be treated with antifungal solutions or varnishes to protect them from decay caused by fungi.
- Food packaging should ensure minimal exposure to air and moisture to reduce the risk of fungal growth.
- Periodic inspection of stored materials and food items helps identify any early signs of fungal contamination.
- It is advisable to maintain low humidity levels indoors, especially in storage areas, to deter fungal spore germination.
