10th class General Science notes for board exam Pakistan — chapter-wise summary covering health, environment, matter, energy, and technology for SSC students.

10th Class General Science Notes — Complete Chapter-wise Summary

Quick Answer: 10th class General Science covers health and disease, biotechnology, the environment, matter and energy, information technology, and the universe. For board exams, focus on definitions, key concepts, and diagram-based questions. General Science is offered to Arts group students as an alternative to separate science subjects.

General Science is a broad subject that gives 10th class Arts group students a solid grounding in the natural and applied sciences. Unlike the separate science subjects (Biology, Chemistry, Physics) taken by Science group students, General Science covers all three disciplines at an introductory level, with additional topics on technology, environment, and health.

This chapter-wise summary covers the key points you need for your board exam.

Health, Nutrition, and Disease

This chapter is one of the most important in General Science and appears in short and long questions regularly.

Nutrition and Food

Carbohydrates: Main energy source. Found in rice, bread, potatoes. Glucose (C₆H₁₂O₆) is the simplest carbohydrate.

Proteins: Essential for growth and repair. Made of amino acids. Sources: meat, eggs, pulses (daal), milk.

Fats: Concentrated energy store, insulation. Sources: oil, butter, nuts.

Vitamins and Minerals:

Vitamin A: Vision, skin health. Deficiency causes night blindness. Source: carrots, liver
Vitamin C: Immune system, prevents scurvy. Source: citrus fruits
Vitamin D: Bone health, absorbs calcium. Deficiency causes rickets. Source: sunlight, fish
Iron: Prevents anaemia. Source: red meat, spinach
Calcium: Bones and teeth. Source: milk, dairy

Infectious Diseases

Bacterial diseases: Tuberculosis (TB), typhoid, cholera Viral diseases: Influenza (flu), dengue, COVID-19, hepatitis Parasitic diseases: Malaria (Plasmodium parasite, spread by Anopheles mosquito)

Prevention methods:

Vaccination — introduces weakened pathogen to build immunity
Antibiotics — kill bacteria (not effective against viruses)
Clean water and sanitation — prevents water-borne diseases
Vector control — mosquito nets and spraying to prevent malaria

Non-Communicable Diseases

Diabetes: Insufficient insulin production; high blood sugar
Hypertension: High blood pressure; risks stroke and heart disease
Cancer: Uncontrolled cell division; caused by mutation, smoking, radiation

Biotechnology and Genetic Engineering

This chapter introduces modern biology applications.

Key Concepts

Biotechnology: Using living organisms to develop products beneficial to humans.

Genetic Engineering: Modifying an organism's DNA to change its characteristics.

Insulin for diabetes is produced by inserting the human insulin gene into bacteria
GM crops (genetically modified) are engineered for pest resistance or higher yield

Fermentation: Using microorganisms (bacteria, yeast) to produce useful products.

Yeast ferments sugar → alcohol + CO₂ (used in bread making and beverages)
Bacteria ferment milk → yoghurt and cheese

Antibiotics: Produced by fungi (penicillin from Penicillium mould — discovered by Alexander Fleming). Kill bacteria without harming human cells.

Vaccines: Made from weakened or dead pathogens. Train immune system to recognize and fight real infection.

Environmental Science

Environmental topics are heavily tested and very relevant to Pakistani students given current environmental challenges.

The Environment

Ecosystem: Community of organisms interacting with their physical environment. Biotic factors: Living components (plants, animals, microbes) Abiotic factors: Non-living components (temperature, water, soil, light)

Food Chain: Transfer of energy from one organism to another. Producer → Primary Consumer → Secondary Consumer → Tertiary Consumer Example: Grass → Grasshopper → Frog → Snake → Eagle

Food Web: Multiple interconnected food chains — more accurately represents nature.

Environmental Problems in Pakistan

Air Pollution:

Causes: Vehicle emissions, industrial smoke, burning waste, brick kilns
Effects: Respiratory diseases, smog, acid rain
Solutions: Catalytic converters, clean energy, tree planting

Water Pollution:

Causes: Industrial waste, agricultural runoff (pesticides, fertilizers), sewage
Effects: Water-borne diseases, death of aquatic life
Solutions: Water treatment plants, proper waste disposal

Soil Pollution:

Causes: Chemical fertilizers and pesticides, plastic waste, industrial chemicals
Effects: Loss of soil fertility, damage to crops
Solutions: Organic farming, proper waste management

Deforestation:

Pakistan has one of the highest deforestation rates in Asia
Effects: Soil erosion, flooding, climate change contribution, loss of biodiversity
Government initiative: Billion Tree Tsunami programme

Global Warming:

Caused by greenhouse gases (CO₂, methane) trapping heat in atmosphere
Pakistan is among the most vulnerable countries despite contributing little to emissions
Glacial retreat in northern Pakistan threatens water supply

Matter, Energy, and Technology

States of Matter

Solid: Definite shape and volume, particles closely packed
Liquid: Definite volume, no definite shape, particles can flow
Gas: No definite shape or volume, particles widely spaced

Changes of state:

Melting: Solid → Liquid (absorbs heat)
Evaporation/Boiling: Liquid → Gas (absorbs heat)
Condensation: Gas → Liquid (releases heat)
Freezing: Liquid → Solid (releases heat)
Sublimation: Solid → Gas directly (e.g., dry ice, camphor)

Energy

Forms of energy: Kinetic, potential, thermal, electrical, chemical, nuclear, sound, light

Law of Conservation of Energy: Energy cannot be created or destroyed, only converted from one form to another.

Renewable vs Non-renewable energy:

Renewable: Solar, wind, hydro, tidal, geothermal (will not run out)
Non-renewable: Coal, oil, natural gas (fossil fuels — finite supply)

Pakistan's energy situation: Pakistan depends heavily on fossil fuels and hydro, with increasing investment in solar and wind energy.

Nuclear Energy

Nuclear Fission: Splitting of heavy atomic nucleus (uranium, plutonium) releases enormous energy. Nuclear Fusion: Joining of light nuclei (hydrogen) releases energy — powers the sun. Pakistan has nuclear power plants at Karachi (KANUPP) and Chashma (CHASNUPP).

Information Technology

Computers and the Internet

Hardware: Physical components (CPU, RAM, hard drive, keyboard, monitor) Software: Programs and operating systems (Windows, Android) Operating System: Manages hardware and provides platform for applications

Types of memory:

RAM (Random Access Memory): Temporary, lost when power off
ROM (Read-Only Memory): Permanent, contains basic startup instructions
Hard Drive/SSD: Permanent storage for files

Importance of IT in Daily Life

Education: E-learning platforms, digital libraries
Healthcare: Electronic medical records, telemedicine
Business: Online banking, e-commerce
Communication: Email, video calling, social media

Cybersecurity basics: Password protection, avoiding phishing emails, not sharing personal information online.

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Frequently Asked Questions

Q: Is General Science harder than separate Biology/Chemistry/Physics? A: General Science is broader but less deep than the separate science subjects. Students generally find it more manageable because no single topic is as detailed. However, the breadth means more topics to cover.

Q: How many marks does General Science carry in 10th class board exams? A: General Science is typically a full paper (75 marks) similar to other science subjects. It is offered to Arts group students who do not take Physics, Chemistry, and Biology separately.

Q: Which chapters of General Science are most important for board exams? A: Health and disease, environmental science, and biotechnology tend to have the most questions. However, the board paper covers all chapters, so balanced preparation is recommended.

Q: Should I memorize definitions for General Science? A: Yes. Board exams reward precise definitions. For every key term (ecosystem, vaccination, biotechnology, etc.), write a clear one-sentence definition and memorize it.

Q: Are diagrams required in General Science? A: Some topics like food chains, ecosystems, and cell diagrams may require simple diagrams. These are less elaborate than biology diagrams but still need to be neat and labelled.