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General Science

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General Science covers the basic understanding of living and non-living things, cells, tissues, plants, animals, the human body, common diseases, nutrition, the solar system, eclipses, meteors, comets, and the achievements of eminent scientists.

General Science Biology & Basic Science Competitive Exams

General Science covers the basic understanding of living and non-living things, cells, tissues, plants, animals, the human body, common diseases, nutrition, the solar system, eclipses, meteors, comets, and the achievements of eminent scientists. In competitive examinations, this chapter tests scientific awareness, factual understanding, and the ability to connect science with everyday life.

What is General Science?

General Science introduces the basic ideas of biology, health, nutrition, astronomy, and scientific discoveries. It helps students understand how living organisms function, how the human body works, how diseases spread, how food provides energy, and how Earth is connected with the solar system.

This chapter is useful for competitive examinations because it includes direct factual questions, concept-based questions, and practical everyday science. Students should learn definitions, examples, differences, important organs, common diseases, food nutrients, celestial bodies, eclipses, and major scientists with their contributions.

Quick idea: General Science connects classroom science with daily life, health, food, nature, space, and scientific inventions.
Area What It Covers Exam Focus
Living World Living and non-living things, cells, protoplasm, tissues. Differences, definitions, examples.
Plants and Animals Growth, reproduction, basic life processes. Plant and animal reproduction, growth features.
Human Body Important organs and their functions. Heart, lungs, brain, kidney, liver, stomach.
Health and Nutrition Epidemics, prevention, food, nutrients, balanced diet. Diseases, causes, vitamins, proteins, carbohydrates.
Space and Scientists Solar system, meteors, comets, eclipses, eminent scientists. Planets, eclipse types, discoveries, inventions.

“Science is a way of understanding life, nature, health, and the universe.”

Science Tip
Key points
  • Differentiate living and non-living things.
  • Understand cells, protoplasm, and tissues.
  • Study growth and reproduction in plants and animals.
  • Learn important human organs and functions.
  • Know common epidemics, causes, and prevention.
  • Understand food as a source of energy.
  • Revise solar system, meteors, comets, and eclipses.
  • Remember eminent scientists and their achievements.
cells tissues human body nutrition epidemics solar system scientists

Major Topics Covered in General Science

General Science is a broad chapter. It is useful to divide it into living world, human body, health, nutrition, space science, and scientific achievements.

Living and Non-Living

Basic classification of objects around us.

  • Characteristics of life
  • Cells
  • Protoplasm
  • Tissues
  • Growth and reproduction
Human Body

Important organs and their functions.

  • Brain
  • Heart
  • Lungs
  • Kidneys
  • Liver
  • Digestive system
Health and Food

Disease prevention and nutrition.

  • Common epidemics
  • Causes of diseases
  • Prevention methods
  • Constituents of food
  • Balanced diet
Space and Discoveries

Solar system and scientific achievements.

  • Planets
  • Meteors
  • Comets
  • Solar eclipse
  • Lunar eclipse
  • Eminent scientists
Rule: Study General Science by connecting each concept with examples, functions, causes, prevention, and practical applications.
Concept Bank
Living Things
Organisms that show life processes such as growth, respiration, reproduction, nutrition, and response to stimuli.
Non-Living Things
Objects that do not show life processes. Example: stone, table, water, air.
Cell
The basic structural and functional unit of life. All living organisms are made of cells.
Protoplasm
The living substance present inside a cell. It includes cytoplasm and nucleus.
Tissue
A group of similar cells performing a specific function. Example: muscle tissue, nerve tissue.
Balanced Diet
A diet containing carbohydrates, proteins, fats, vitamins, minerals, water, and roughage in proper proportion.
Epidemic
A disease that spreads rapidly among many people in a particular area at the same time.
Eclipse
An eclipse occurs when one celestial body comes in the shadow of another celestial body.

Tip: For exam preparation, revise each term with definition, example, and importance.

General Science Study Guide

General Science questions become easier when you identify whether the question is about life processes, human organs, food, disease, space, or scientists.

Question Type What to Recall Typical Clue
Living world question Living vs non-living, cells, tissues Growth, reproduction, respiration, response
Human body question Organ and function Heart pumps blood, lungs help breathing
Disease question Cause, spread, prevention Vaccination, hygiene, mosquito control
Food question Nutrients and balanced diet Energy, growth, repair, deficiency
Solar system question Planets, meteors, comets, eclipses Sun, Moon, Earth, shadow, orbit
Scientist question Scientist and contribution Discovery, invention, law, theory
Exam shortcut: For each subtopic, prepare one table: term, meaning, example, and importance.

Difference Between Living and Non-Living Things

Living things show life processes such as growth, respiration, reproduction, nutrition, excretion, and response to stimuli. Non-living things do not show these life processes.

Basis Living Things Non-Living Things
Cellular structure Made up of one or more cells. Not made up of cells.
Growth Show internal growth. Do not grow by life processes.
Respiration Respire to release energy. Do not respire.
Reproduction Can reproduce their own kind. Cannot reproduce.
Response Respond to stimuli such as light, sound, touch, and temperature. Do not respond by themselves.
Examples Plants, animals, humans, bacteria. Stone, chair, water, soil, air.
Remember: Growth alone is not enough to identify life. Living things show multiple life processes such as respiration, reproduction, and response to stimuli.

Basis of Life: Cells, Protoplasm and Tissues

The cell is the basic unit of life. Protoplasm is the living material inside the cell. A tissue is a group of similar cells working together to perform a particular function.

Term Meaning Important Point
Cell Smallest structural and functional unit of life. Organisms may be unicellular or multicellular.
Cell Membrane Outer boundary of the cell. Controls entry and exit of substances.
Cytoplasm Jelly-like substance inside the cell membrane. Many cell activities occur here.
Nucleus Control centre of the cell. Contains hereditary material.
Protoplasm Living substance of the cell. Includes cytoplasm and nucleus.
Tissue Group of similar cells performing a function. Examples: muscle tissue, nerve tissue, blood tissue.
Exam focus: Cell is the unit of life, nucleus controls cell activities, and tissue is a group of similar cells performing a specific function.

Growth and Reproduction in Plants and Animals

Growth and reproduction are important characteristics of living organisms. Growth increases size and development, while reproduction produces new individuals of the same kind.

Growth in Plants
  • Plants grow throughout life in specific growing regions.
  • Roots grow downward and shoots grow upward.
  • Growth needs water, minerals, sunlight, air, and suitable temperature.
  • Plants prepare food by photosynthesis.
  • Seeds germinate into new plants under suitable conditions.
Growth in Animals
  • Animals grow up to a certain stage of life.
  • Growth depends on food, oxygen, water, hormones, and health.
  • Animals cannot prepare their own food.
  • Young ones develop into adults.
  • Different animals show different life cycles.
Reproduction in Plants
  • Plants reproduce by seeds, spores, stems, roots, and leaves.
  • Flowers are reproductive organs of flowering plants.
  • Pollination and fertilization help seed formation.
  • Some plants reproduce vegetatively, such as potato and sugarcane.
Reproduction in Animals
  • Animals reproduce sexually or asexually.
  • Human beings and most higher animals reproduce sexually.
  • Some animals lay eggs, while some give birth to young ones.
  • Reproduction maintains continuity of species.
Remember: Growth increases the size and development of an organism. Reproduction produces new organisms and maintains the species.

Elementary Knowledge of Human Body and Important Organs

The human body is made up of many organ systems. Each organ performs a specific function necessary for life, growth, movement, protection, and reproduction.

Organ System Main Function
Brain Nervous system Controls body activities, thinking, memory, and coordination.
Heart Circulatory system Pumps blood throughout the body.
Lungs Respiratory system Help in exchange of oxygen and carbon dioxide.
Stomach Digestive system Helps digest food using digestive juices.
Small Intestine Digestive system Completes digestion and absorbs nutrients.
Liver Digestive and metabolic system Produces bile and helps in metabolism and detoxification.
Kidneys Excretory system Filter blood and remove wastes in the form of urine.
Skin Integumentary system Protects the body and helps regulate temperature.
Bones Skeletal system Provide support, protection, and shape to the body.
Muscles Muscular system Help in movement and posture.
Common trap: The heart pumps blood; it does not purify blood. Kidneys filter blood and remove wastes.

Common Epidemics: Causes and Prevention

An epidemic is the rapid spread of a disease among many people in a region. Epidemics may be caused by bacteria, viruses, parasites, contaminated water, poor sanitation, or disease-carrying insects such as mosquitoes.

Disease / Epidemic Common Cause / Spread Prevention
Cholera Contaminated food and water. Clean drinking water, sanitation, handwashing.
Typhoid Contaminated food and water. Safe food, clean water, vaccination where advised.
Malaria Mosquito bite. Mosquito control, nets, removing stagnant water.
Dengue Aedes mosquito bite. Avoid water stagnation, use mosquito protection.
Influenza Respiratory droplets. Cover coughs, hand hygiene, avoid close contact during illness.
Measles Viral infection spread through droplets. Vaccination and isolation of infected persons.
Plague Bacterial disease associated with rodents and fleas. Rodent control, cleanliness, medical treatment.
Prevention focus: Clean water, sanitation, vaccination, mosquito control, personal hygiene, and early medical care help prevent epidemics.

Food: Source of Energy, Constituents of Food and Balanced Diet

Food provides energy, supports growth, repairs body tissues, protects against diseases, and maintains body functions. A balanced diet contains all essential nutrients in proper quantities.

Constituent Main Function Sources
Carbohydrates Main source of energy. Rice, wheat, potato, sugar, bread.
Proteins Growth and repair of body tissues. Pulses, milk, eggs, fish, meat, beans.
Fats Concentrated source of energy and insulation. Oil, ghee, butter, nuts, seeds.
Vitamins Protect body and regulate functions. Fruits, vegetables, milk, eggs.
Minerals Help in bones, blood, nerves, and body regulation. Green vegetables, milk, fruits, cereals.
Water Helps digestion, circulation, temperature control, and waste removal. Drinking water, fruits, vegetables.
Roughage Helps bowel movement and digestion. Whole grains, fruits, vegetables, salads.
Balanced diet: A balanced diet should contain energy-giving, body-building, and protective foods in suitable proportions.

The Solar System, Meteors, Comets and Eclipses

The solar system consists of the Sun, planets, satellites, asteroids, meteoroids, comets, and other celestial bodies. Earth is a planet of the solar system and the Moon is its natural satellite.

Solar System
  • The Sun is the centre of the solar system.
  • Planets revolve around the Sun in fixed paths called orbits.
  • Earth is the third planet from the Sun.
  • The Moon revolves around Earth.
  • Planets do not have their own light; they reflect sunlight.
Meteors and Comets
  • Meteoroid: Small rocky body moving in space.
  • Meteor: Bright streak seen when a meteoroid enters Earth’s atmosphere.
  • Meteorite: Part of a meteoroid that reaches Earth’s surface.
  • Comet: Icy celestial body with a glowing head and tail near the Sun.
  • Comets move around the Sun in long elliptical orbits.
Solar Eclipse

A solar eclipse occurs when the Moon comes between the Sun and Earth and blocks sunlight from reaching part of Earth.

  • Order: Sun – Moon – Earth
  • Occurs on a new moon day.
  • Can be total, partial, or annular.
Lunar Eclipse

A lunar eclipse occurs when Earth comes between the Sun and the Moon and Earth’s shadow falls on the Moon.

  • Order: Sun – Earth – Moon
  • Occurs on a full moon day.
  • Can be total or partial.
Common trap: Solar eclipse occurs on new moon day, while lunar eclipse occurs on full moon day.

Achievements of Eminent Scientists

Many scientists have made important contributions to our understanding of life, matter, energy, space, medicine, and technology. Competitive exams often ask direct questions about scientists and their discoveries or inventions.

Scientist Major Achievement / Contribution Area
Isaac Newton Laws of motion and law of gravitation. Physics
Albert Einstein Theory of relativity and mass-energy relation. Physics
Galileo Galilei Improved telescope and supported heliocentric view. Astronomy and Physics
Charles Darwin Theory of evolution by natural selection. Biology
Louis Pasteur Germ theory of disease, pasteurization, vaccines. Microbiology
Alexander Fleming Discovery of penicillin. Medicine
Marie Curie Research on radioactivity; discovery of polonium and radium. Physics and Chemistry
C. V. Raman Discovery of Raman Effect. Physics
Jagadish Chandra Bose Work on radio waves and plant physiology. Physics and Biology
Homi J. Bhabha Major contribution to India’s nuclear science programme. Nuclear Science
A. P. J. Abdul Kalam Contribution to missile and space technology in India. Aerospace and Defence
Gregor Mendel Principles of heredity through experiments on pea plants. Genetics
Exam focus: Prepare scientist-name and contribution pairs. These questions are usually direct and scoring.

Step-by-Step General Science Learning Method

Step Action Example Focus
Step 1 Identify the topic area. Biology, health, nutrition, astronomy, or scientists.
Step 2 Learn the definition clearly. Cell, tissue, epidemic, balanced diet, eclipse.
Step 3 Connect with examples. Heart pumps blood, carbohydrates give energy.
Step 4 Prepare comparison tables. Living vs non-living, solar vs lunar eclipse.
Step 5 Revise factual pairs. Scientist and discovery, disease and prevention.
Important: General Science is best revised through short notes, comparison tables, disease-prevention charts, food-nutrient tables, and scientist-contribution lists.

Solved Examples

Question Explanation Answer
What is the basic unit of life? All living organisms are made up of cells. Cell
Which organ pumps blood in the human body? The heart pumps blood through blood vessels. Heart
Which nutrient is the main source of energy? Carbohydrates provide quick energy to the body. Carbohydrates
Which disease is commonly spread by mosquitoes? Malaria is spread by mosquito bites. Malaria
When does a solar eclipse occur? It occurs when the Moon comes between the Sun and the Earth. Sun – Moon – Earth
When does a lunar eclipse occur? It occurs when the Earth comes between the Sun and the Moon. Sun – Earth – Moon
Who discovered penicillin? Penicillin was discovered by Alexander Fleming. Alexander Fleming
Who is known for the laws of motion? Isaac Newton gave the laws of motion. Isaac Newton

Note: General Science questions often require direct recall supported by clear conceptual understanding.

Common Traps and Shortcuts

Common Traps
  • Thinking all things that move are living things.
  • Confusing cell, tissue, organ, and organ system.
  • Forgetting that plants also respire.
  • Confusing heart and kidney functions.
  • Mixing up disease cause and disease spread.
  • Calling fats the only source of energy.
  • Confusing meteors and meteorites.
  • Mixing up solar and lunar eclipse positions.
  • Forgetting scientist-contribution pairs.
Useful Shortcuts
  • Cell is the basic unit of life.
  • Tissue is a group of similar cells.
  • Heart pumps blood.
  • Lungs exchange gases.
  • Kidneys filter blood.
  • Carbohydrates are the main energy source.
  • Proteins help growth and repair.
  • Solar eclipse: Sun – Moon – Earth.
  • Lunar eclipse: Sun – Earth – Moon.
Exam approach: For every concept, prepare one example. For every disease, learn cause and prevention. For every scientist, remember the key contribution.

Practice

A) Multiple Choice Questions
  1. The basic unit of life is:
    Tissue Cell Organ Blood
  2. Which organ pumps blood in the human body?
    Lungs Kidney Heart Liver
  3. The main source of energy in food is:
    Vitamins Carbohydrates Minerals Water
  4. A solar eclipse occurs when:
    Earth comes between Sun and Moon Moon comes between Sun and Earth Sun comes between Earth and Moon Mars comes between Sun and Earth
  5. Who discovered penicillin?
    Isaac Newton Alexander Fleming Charles Darwin C. V. Raman
B) Short Answer Questions
  1. Write two differences between living and non-living things. (Hint: Cells, respiration, reproduction, response.)
  2. What is protoplasm? (Hint: Living substance of the cell.)
  3. Name three important organs of the human body and their functions. (Hint: Heart, lungs, kidneys.)
  4. What is a balanced diet? (Hint: All nutrients in proper proportion.)
  5. Differentiate between meteors and comets. (Hint: Bright streak in atmosphere vs icy body orbiting Sun.)
C) Match the Concept with the Correct Meaning
Concept Correct Meaning / Contribution
Cell Basic unit of life
Tissue Group of similar cells performing a function
Heart Pumps blood
Kidneys Filter blood and remove wastes
Carbohydrates Main source of energy
Solar Eclipse Moon comes between Sun and Earth
Alexander Fleming Discovery of penicillin
C. V. Raman Discovery of Raman Effect
General Science Reminder

General Science develops awareness of life processes, cells, tissues, human organs, diseases, nutrition, the solar system, eclipses, and scientific discoveries. This chapter should be revised using comparison tables, organ-function charts, disease-prevention lists, nutrient tables, and scientist-contribution pairs.

Task: Create five General Science questions using one question each from living things, human body, epidemics, food and nutrition, and the solar system.

Show Suggested Answers
Multiple Choice
  1. Cell
    The cell is the basic structural and functional unit of life.
  2. Heart
    The heart pumps blood throughout the body.
  3. Carbohydrates
    Carbohydrates are the main source of energy in food.
  4. Moon comes between Sun and Earth
    A solar eclipse occurs when the Moon comes between the Sun and Earth.
  5. Alexander Fleming
    Alexander Fleming discovered penicillin.
Short Answer Questions
  1. Living things are made up of cells and can respire, grow, reproduce, and respond to stimuli. Non-living things are not made up of cells and do not perform life processes.
  2. Protoplasm is the living substance present inside a cell. It includes the cytoplasm and nucleus.
  3. Heart: pumps blood. Lungs: exchange oxygen and carbon dioxide. Kidneys: filter blood and remove wastes.
  4. A balanced diet is a diet that contains carbohydrates, proteins, fats, vitamins, minerals, water, and roughage in proper proportions.
  5. A meteor is a bright streak seen when a meteoroid enters Earth’s atmosphere. A comet is an icy celestial body that revolves around the Sun and may show a glowing tail.
Concept Matching
  1. Cell → Basic unit of life
  2. Tissue → Group of similar cells performing a function
  3. Heart → Pumps blood
  4. Kidneys → Filter blood and remove wastes
  5. Carbohydrates → Main source of energy
  6. Solar Eclipse → Moon comes between Sun and Earth
  7. Alexander Fleming → Discovery of penicillin
  8. C. V. Raman → Discovery of Raman Effect
Clue Explanation

General Science questions are mostly based on definitions, examples, functions, causes, prevention, and factual pairs. Revise living processes, organ functions, disease prevention, nutrients, eclipses, and scientist achievements regularly.

Exam tips
  • Revise living and non-living differences.
  • Remember cell, tissue, organ, and system order.
  • Learn organ-function pairs.
  • Study epidemics with cause and prevention.
  • Prepare nutrient-source-function table.
  • Differentiate solar and lunar eclipse clearly.
  • Remember meteor, meteorite, and comet differences.
  • Memorize scientist and contribution pairs.
Practice MCQs