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Chapter 3 - 7: Online NCERT Summary Class - VI (Science) for UPSC CSE
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"Be brilliant with the basics, rest all will follow", Roman begins this lesson with awesome and meaningful advice. As this beautiful line suggests Roman has discussed few basic but very important concepts from class 6 NCERT chapter 3-7. The concepts which you'll gain a firm foundation on will be Fibre to Fabric, Sorting Material into Groups, Separation of Substances where you'll learn about terms like threshing, winnowing, sieving, sedimentations, decantation, filtration, ​evaporation, and condensation. The next thing he has described is about the changes happening around us and lastly about the basic points related to plants.​

Roman Saini is teaching live on Unacademy Plus

Roman Saini
Part of a great founding team at Unacademy with Gaurav, Hemesh. Movies, Guitar, Books, Teaching.

Unacademy user
Thanku sir really u r grate n best teacher for us u r like a god😄😄😄😄😄👍😍
Please provide these slides in downloadable formats sir
Prashant Mishra
a year ago
u can take screenshots and use them as you wish like u can make notes in pdf form......
Very helpful sir, thankful to you sir. Please make on social if possible sir.
It is very helpful and time saving thanks sir
Sir I am recently given exam of 12 class from Army public school,jaipur. I WANT to be an I.A.S OFFICER SO, which subject should I take in graduation as to clear UPSE AFTER COMPLETING MY GRADUATION .Is the coaching is necessary ,if necessary then which coaching institute should I chose in Delhi.
  1. Class 6 Science NCERT Part 2: Chapter 3-7 Presented by Dr. Roman Saini

  2. About me MBBS, AIIMS 706-1334 EST Cleared CSE-2013 Loves playing Guitar, Movie Buff * Course Fee : Contribute Follow me on Unacademy

  3. Be brilliant with the basics, rest all will follow.

  4. s Ch 3: Fibre to fabric Fibres: cotton, wool, silk or synthetic. Cotton, wool (rabbit, yak, camel, sheep, goat), silk (cocoon), jute: Natural fibres; Polyesters nylons: synthetic Loose thread-yarn-can be pulled. Thin strands in a single yarn-fibres. Spinning (making yarns from fibres using takli or charkha) Yarns into fabric-weaving (looms) and knitting Cotton bolls, burst, seeds with cotton fibres (machine or hand separation is called ginning of cotton bolls) Jute: Stem, West Bengal, Bihar, Assam, Bangladesh, stem immersed in water for few days, rotting of stem, fibres are separated

  5. Clothing in ancient times: Leaves, twigs, Vines, animal fleece or hair were twisted together into long strands Flax in nile

  6. Weaving Spinning . Fabric Fibres Yarns Knitting

  7. -2. Ch 4: Sorting-materialinto groups 1 Objects 1 or many materials 1 material = many objects Grouping helps in systematic arrangement and better study, analysis etc. , Metals like aluminium, iron, copper have lustre (gentle sheen or soft glow), action lose it (rust etc.) of air and water Hard or soft - Mohs scale of mineral hardness (1 to 10 - talc to diamond, scratch) (8) topaz; and (9) corundum (10) Diamond s (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; Soluble or insoluble; Transparent or translucent

  8. Ch 5: Separation of substances Make it fitter, purer for use; handpicking for slightly larger impurities, separate grain from stalks etc. threshing; using wind for separation winnowing (heavy grain particles falls, lighter particles are blown away), sieving: passing of smaller particles though minute holes while retention of larger particles Sedimentation: When the heavier component in a mixture settles (followed by water addition), Decantation: Removal of water and impurities, Filtration: Passing though strainer, filter should have pores smaller than impurities. Evaporation: Water into vapour, happens at all the temperatures continuously, wherever water is present

  9. Process of conversion of vapour into its liquid form is called condensation When no more solute can dissolve in a solution, it is saturated(saturation point varies from solute to solute and solution to solution) More solute can be added in a solution, if its temperature is increased If temperature is decreased (cooling) the solute precipitates out Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar

  10. Ch 6:Changes around us Reversible and irreversible Heat makes matter expand, cooling contracts Physical changes can be reversed using physical means only (exception alloys, evaporation, condensation, sublimation, desublimation or deposition) Chemical changes are usually not reversible using physical means alone (they need a chemical reaction to be reversed, ex: hardening of cement, POP rusting of iron etc.)

  11. Ch 7: Getting to know plants ), sepals (shy, buds, I s Stamens (male: anther and filament) and pistil (female, innermost: stigma, style, ovary containing ovules) Tap roots = reticulate venation, Fibrous roots = parallel venation Herbarium: Collection of leaves in a book If the sepals of a flower are jointed, then the pistil is jointed to the petal. If the petals of a flower are jointed together, then the pistil is jointed to the the petal. Answer : It may or may not be true,

  12. Ch 8: Body movements Run, fly, jump, creep, crawl, slither, swim, walk Joints: Articulation between bones, cartilage, tendons etc. Movement (except atskull, sacral, sternal, and pelvic bones) and stability Ball and socket joint- cavity (hollow space) + head/ball of a bone, huge range, shoulder and hip joint Pivotal joint- Neck (median atlanto-axial joint), Radio ulnar joints (both), IV only rotation allowed Hingejoint movement only on one axis-wrist and knee joint Fixed ioint. Cant move, skull joints, upper jaw with skull

  13. Ch 8:Body movements dy Skeleton- framework of bones in our body, gives us shape, X-Ray. Rib cage: Sternum (chest bone) + Vertebral column are connected thorough 24 (12*2) ribs, 7 (true ribs, attach directly to sternum)+ 3 (false ribs, attach through coastal cartilages to 7th rib +2 (floating ribs, hanging ribs) - called thorax, thoracic cavity shoulder bones, pelvic are not as hard as the bones and which can be bent. These are called cartilage.

  14. Ch 8:Body movements Muscles, contraction to bulging (Shorter, stiffer and thicker), works in pars (contraction + relaxation), only pull, at least 2 muscles are required to work for movement on a joint. Earthworm has muscles, no bones, tiny bristle hairs, eats soils and move forward and excrete, very helpful for farming * Snail have one shell, which is dragged by strong foot muscles Cockroaches have 3 pair of legs, can walk, climb and fly, thick exoskeleton with joints

  15. Ch 8: Body movements Birds have pneumatic and hollow bones with strong muscles Fishes have small head and tail, with streamlined body, series of jerks in strong muscles, with tail assisting in the direction, fins help in the balance Snakes slithers, forming loops (give forward push by pressing against the ground, sideways and not in a straight-line), long backbone, small muscles, interconnecting backbone, ribs and skin