SCIENCE Class VI Notes
Chapter 1: Components of Food
Lists food items commonly eaten in different regions of India.
Explains the importance of having variety in meals.
Introduces nutrients: carbohydrates, proteins, fats, vitamins, and minerals.
Also mentions dietary fibres and water.
Simple tests to detect the presence of carbohydrates (starch), proteins, and facts. Includes necessary solutions like iodine, copper sulphate and caustic soda.
Carbohydrates:
Exists in the form of starch and sugars.
Test for Starch: Add 2-3 drops of dilute iodine solution. A blue-black color indicates presence of starch.
Proteins:
Test for Protein: Add 2 drops of copper sulphate solution and 10 drops of caustic soda solution to the food item. A violet color indicates presence of proteins.
Fats:
Test for Fats: Wrap food item in paper and crush it. An oily patch indicates presence of fats.
Carbohydrates and fats: provide energy to the body.
Proteins: needed for growth and repair.
Vitamins: protect against diseases and keep eyes, bones, teeth, and gums healthy (Vitamin A, C, D, E, K, B-complex).
Minerals: needed for proper growth and health (calcium, iron, phosphorus, iodine).
Dietary fibres (roughage): provided by plant products, aids in digestion.
Water: helps in absorbing nutrients and removing waste.
Balanced diet: includes all nutrients in right quantities, along with roughage and water.
Discusses the impact of cooking methods on nutrient retention (e.g., washing after cutting, excess water use, heat destroying Vitamin C).
Overeating fats leads to obesity.
Deficiency diseases: caused by lack of nutrients over a long period.
Examples: stunted growth, swelling of face, discolouration of hair, skin diseases, and diarrhoea, caused by protein deficiencies.
Deficiency of both carbohydrates and proteins results in complete cessation of growth.
Lists deficiency diseases caused by Vitamin A, Vitamin B1, Vitamin C, Vitamin D, Calcium, Iodine, and Iron. (Night blindness, Beriberi, Scurvy, Rickets, Tooth decay, Goiter, Anemia)
Fortification of food is the addition of key vitamins and minerals to staple foods such as rice, wheat, oil, milk and salt to improve their nutritional content.
Chapter 2: Sorting Materials into Groups
Objects are grouped based on shape, materials, or other properties.
Materials include glass, metal, plastics, wood, cotton, paper, mud, or soil.
Activity 1: Collecting and separating objects based on materials (paper, wood).
Activity 2: Listing objects made from common materials.
Appearance: Materials look different (wood vs. iron); some may have similarities (iron, copper, aluminum).
Activity 3: Identifying shiny materials and those with lustre.
Lustre: Metals like iron, copper, aluminum, and gold have lustre.
Hardness: Materials can be hard (difficult to compress) or soft (easily compressed).
Soluble and insoluble: Some substances dissolve in water (soluble), others do not (insoluble).
Activity 4: Testing the solubility of sugar, salt, chalk powder, sand, and sawdust.
Activity 5: testing the solubility of vinegar, lemon juice, mustard oil/coconut oil, kerosene.
Liquids: Some mix well with water; others form separate layers.
Gases: Some are soluble in water (oxygen for aquatic life).
Objects may float or sink in water.
Transparency: Materials can be transparent (see-through), opaque (cannot see through), or translucent (see through partially).
Shopkeepers use transparent containers to display items.
Activity 6: Testing transparency by looking through paper, oiled paper.
Materials are grouped for convenience and to study their properties.
Chapter 3: Separation of Substances
Instances of separating substances: straining tea leaves, churning milk for butter, ginning cotton.
Need to separate harmful/non-useful substances from mixtures.
Separation methods include handpicking, threshing, winnowing, sieving, sedimentation, decantation, filtration, evaporation, and condensation.
Handpicking: Removing larger impurities by hand.
Threshing: Separating grain from stalks by beating.
Winnowing: Separating heavier and lighter components with wind.
Sieving: Separating particles of different sizes using a sieve.
Sedimentation: Allowing heavier components to settle.
Decantation: Pouring out the clear liquid above the sediment.
Filtration: Using a filter to separate solid particles from a liquid.
Activity 5: Demonstration and explanation of sedimentation and decantation.
Evaporation: Converting liquid into vapour to separate dissolved solids (e.g., salt from water).
Activity 6: Demonstration of filtration to separate insoluble impurities.
Multiple methods: Using several separation techniques in combination.
Activity 7: Separating sand and salt by decantation, filtration, evaporation, and condensation.
Saturated solution: When no more of a substance can be dissolved in a solution.
Activity 8: Mixing larger quantity of salt in sand than needed to form a saturated solution.
Heating increases solubility: More substance can be dissolved in solution by heating.
Activity 9: Add salt a saturated solution and heat it to dissolve it.
Solubility varies: Water dissolves different substances in different amounts.
Activity 10: Comparison of different soluble substances in water.
Chapter 4: Getting to Know Plants
Classification of plants: Herbs, shrubs, and trees.
Herbs: Green, tender stems, short, few branches.
Shrubs: Branches near the base, hard stem but thick.
Trees: Tall, hard, thick stem, branches high above ground.
Creepers: Weak stems that spread on the ground.
Climbers: Take support and climb.
Stem: Bears leaves, branches, buds, flowers, and fruits.
Activity 2: Stem helps in upward movement of water.
Leaf: Petiole (attaches to stem) and lamina (broad, green part).
Activity 3: Taking leaf impressions to observe veins and midrib.
Venation: Reticulate (net-like) and parallel.
Activity 4: Transpiration experiment.
Transpiration: Water comes out of leaves as vapour.
Photosynthesis: Leaves prepare food using sunlight, water, and carbon dioxide.
Activity 5: Testing for starch in a leaf.
Root: Absorbs water and minerals.
Activity 6: One plant with root, one without root, to demonstrate function.
Activity 7: Separating young plants grown on wet cotton.
Taproot: Main root with smaller lateral roots.
Fibrous root: No main root, all roots similar.
Leaf venation and root type connection: Reticulate venation plants have taproots, parallel venation have fibrous roots.
Root examples: carrot, radish, sweet potato, turnip, tapioca (where food is stored).
Flower: Parts include sepals, petals, stamens, and pistil.
Activity 10: Dissecting/ studying a flower; noting their parts.
Activity 11: Studying parts of ovary: stigma, style and ovary and cutting it open.
Chapter 5: Body Movements
Movements in the human body, from blinking to locomotion.
Different ways animals move (walking, running, flying, jumping, creeping, crawling, slithering, swimming).
Activity 1: Testing movement of the elbow.
Observation that we are able to bend at joints.
Joints: elbow, shoulder and neck.
Bones make up hard skeleton. Humans body can only bend bones at joints.
Ball and socket joints: Allow movement in all directions (e.g., shoulder).
Activity 2: Making a model to understand the ball and socket joint.
Pivotal joint: Neck joint, allows forward, backward, and side movements.
Hinge joints: Allow back and forth movement (e.g., elbow, knee).
Activity 3: Making a cardboard model to understand the hinge joint.
Fixed joints: Bones cannot move (e.g., upper jaw).
Skeleton: Framework of bones that gives shape to the body.
X-ray images: Used to see bone shapes.
Feel the bones in your forearm, upper arm, lower leg and upper leg.
At birth, human skeleton composed of around 305 bones but changes to 206 bones after some bones have fused together.
Rib cage: Protects internal organs.
Vertebrae: Small bones of the backbone.
Shoulder bones and pelvic bones.
Skull: Made of many bones joined together and protects brain.
Cartilage: Additional parts of the skeleton that are not hard as bones (e.g., ear).
Muscles: Work in pairs to move bones through contraction and relaxation.
Earthworm: Body made of rings, no bones, uses muscles and bristles for movement.
Activity 5: Observation of movement of earthworm.
Snail: Carries shell, moves with muscular foot.
Activity 6: Obsevation of a snail by tilting the glass plate.
Cockroach: Walks, climbs, and flies; has three pairs of legs and two pairs of wings.
Birds: Fly with hollow light bones, wings, strong shoulder bones.
Activity 7: make a paper boat, test streemline to see how it moves through the water.
Fish: Streamlined shape, fins and tails for swimming.
Snakes: Long backbone, thin muscles, moves in loops.
Yoga is an invaluable gift of the ancient Indian tradition. It helps in relieving joint pain.
Chapter 6: The Living Organisms—Characteristics and Habitats
Vacation experiences: Trips to the river Ganga, Himalayas, Rajasthan, and Puri showcasing varied environments.
Inquiry about living organisms in different places.
Activity 1: List of objects, plants, and animals found in different surroundings.
Habitat and Adaptation: Organisms and their respective surroundings.
Adaptation of organisms to differ depending on their place of dwelling.
Terrestrial habitats: Forests, grasslands, deserts, coastal and mountain regions.
Aquatic habitats: Lakes, rivers and oceans.
Biotic components: Living organisms.
Abiotic components: Non-living things (rocks, soil, air, water).
Acclimatisation and adaptation differ, with acclimatisation referring to immediate changes.
Deserts: Adaptations of camels, rats, snakes, and plants.
Activity 3: Comparison and impact on seed growth in a bag covered with a plant.
Mountain regions: Adaptations of trees, yaks, snow leopards, and mountain goats.
Grasslands: Adaptations of lions and deer.
Oceans: Adaptations of fish, squids, octopus, dolphins, and whales.
Ponds and lakes: Adaptations of aquatic plants (roots, stems, leaves) and frogs.
Organisms classified as living and non-living based on common characteristics.
Common characteristics, including need for: Food, Respiration, Excretion, Responsiveness, Reproduction, Movement, Growth, Death
Activity 4: Determine the effect of light on potted plants.
Activity 5: Observe the behaviour of growing potatoes.
Debate of common characteristics, as there are times it can be difficult to label them.
Chapter 7: Motion and Measurement of Distances
Modes of transport, from ancient times to modern ones.
Initial methods of travel: Foot, animals and small boats.
19th Century steam engine leads to new means of transport.
Introduction of cars, trucks, and buses.
Early 1900s saw the development of airplanes and now there is spacecrafts.
People knew the distances traveled. By this, they know which places to walk.
Importance of measuring lengths and distances.
Measurement of desks using gilli and danda (non-standard units).
Activity 1: Measurement of classroom length and breadth using foot length as a unit.
Activity 2: Measurement of table width by handspan; use string to measure portions.
Need for Standard Units of Measurement.
Old Methods that people used to know the distances between them:
Using a Cubit for the length from the Elbow to the finger.
Using a Yard by measure from the Chin to the outstretched arm.
Using Paces or steps.
Development of French System of Units, which led to the metric system.
SI (System International) Units of Measurement.
SI unit of length: Metre (m); also centimetre (cm) and millimetre (mm).
Kilometre (km) used for larger distances;
Three different Ways to properly measure length:
Place the scale along the object
Correct the Ends of the measurement
Correct Position of the eye
Activity 3: Measuring height of classmate using hand span and metre scale.
Correct method to measure a curved line with a string.
Distinction between objects at rest and in motion.
Activity 5: Think of some objects and list them into a table as either at Rest or in Motion.
Activity 6: Track the movement of an ant.
Types of Motion: Rectilinear, Circular, and Periodic.
Rectilinear motion: Object move in a Straight Line.
Circular motion: The distance of the stone from the hand is the same.
Periodic motion: Where an Object or Part of it repeats its motion after a fixed interval
Chapter 8: Light, Shadows and Reflections
Importance of light in seeing objects.
Luminous objects: Emit their own light (e.g., torch bulb, Sun).
Non-luminous objects: Visible through reflected light.
Transparent: See-through objects.
Opaque: Does not allow light and cant see through it.
Translucent: Allows light to pass partially.
Activity 1: test objects as each of these three definitions.
Shadows: Dark patches formed when light is obstructed by an opaque object.
Activity 2: Hold opaque objects in sunlight; have students sketch and identify their shadows.
Activity 3: Torch and cardboard activity in the dark to show need for a screen to see shadows.
Misleading nature of shadows regarding shapes.
Activity 4: Chair on school ground or a Notebook with light.
Pinhole camera: Simple device to form images.
Activity 5: Making and using a pinhole camera with boxes and tracing paper.
Images are inverted in a pinhole camera/observe light during a solar eclipse.
Straight-line path of light. (If light can shine through a line). Opaque objects make a shadow.
Activity 6: Check if light travels in a straight line.
Mirrors and Reflection: reflection of objects in front of mirror.
Activity 7: Beam light with mirror at friend (bouncing light).
Activity 8: Comb/Mirror experiment with sunlight.
Chapter 9: Electricity and Circuits
Uses of electricity in daily life.
Electricity to light a home, roads, markets, and factories after sunset.
Electric Cell: Provides electricity in a torch.
Electric cells are used for alarm clocks, wristwatches, transistor radios, ect.
An electric cell has a Metal Cap (Positive Terminal) and a Metal Disc (Negative Terminals), and + signs and - signs on the cell to reflect the positives and negatives.
Electric cell produces current through the chemicals stored in them.
A Bulb is needed for the electric circuit, made of glass that is fixed to a metallic base.
Caution: Electricity can be dangerous.
Filament in middle of bulb that glows.
Activity 1: Inside view of the bulb
Activity 2: try to connect a bulb to four different lenghts of wires. These wires are differently collared. You can add tape made by an electric to help with the wires being held.
Electric Circuit: A complete path for electricity to pass (current to flow) between the two terminals of the electric cell.
Electric Bulb glows when the electrical current is going through the it.
Filament: The reason why a bulb is not glowing.
Activity 3: make touch at home by gathering; touch bulb, peace of wire, a rubber band.
Electric Switch: Device that breaks or completes the circuit.
Activity 4: making a switch with two drawing pins.
Electric Conductors and Insulators.
Test them for a conductor and insulators.
Activity 5: Bulb and Wire Testing to make it conduct.
Materials which allow an electrical current to pass through them are called Conductors, while others are knows as Insulators.
Chapter 10: Fun with Magnets
Magnets used to pick up iron scraps from junk yards.
Magnets are in stickers, pen holders and pencil boxes.
Story of Magnes: A shepherd in ancient Greece whose iron-tipped stick got attracted to a rock (magnetite).
Magnets are natural. Some are created later.
Artificial magnets are created in multiple shapes such as; bar, horse-shoe, cylinder or ball ended.
Activity 1: How Magents work.
Activity 2: what are Non-Magnet and Magnetic materials
Magnetic materials: Iron, nickel, cobalt.
Activity 3: Rub Soil in the sand and find small traces of Iron Filings.
Magnet also have opposite forces and they push back from each other.
Activity 4: Rubbing Steel on Magnet.
Poles of Magnet: more iron fillings and attracted to them.
Activity 5: bar magnet testing it in the sky to observe the movements.
Finding Directions: Using Magents
Points facing North and South
Make Your Own Magnet and Compasses
Attraction and Repulsion: Opposite Poles attract.
Cautions: Heat/ Hammer / or Drop may lose Magnetism.
Always separate by soft pieces when saving it.
Chapter 11: Air Around Us
Importance of air for all living things.
Sensing air's presence: Tree rustling, clothes swaying, kite flying.
Air motion: Affect on firki and windmill operations.
Activity 1: Make a Firki of your own.
Activity 2: Find is Air is Present Everywhere or Not
Air is Present Everywhere around Us.
The atmosphere surrounds the earth and helps with our survival.
Air is a mixture of Multiple gases. Scientists has found this.
Components of Air:
Water Vapour: Transperant.
Nitrogen: not supporting gas
Carbon Dioxide
Dust and Smoke
Activity 3: Oxygen with a Fixed small small candle.
Activity 4: Sunlight shinning through a doorway shows the sunlight. and dust particles dancing around.
How do Aniamals and Pland help with each other to bring back Oxygen:
Animals help consume oxygen and eat other animals.
Aquatic Animals need Water
Turbid animals need oxygen to help them respire.
Activity 5: to show the oxygen is available in Water
Activity 6: to find the air inside of soil
A lump of dried Soil in a liquid will have tiny bubbles, indicating air.
The Atmosphere Replenishing Oxygen
Photosynthesis in plants replaces the oxygen.