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Chapter 9: Online NCERT Summary Class - VI (Science) for UPSC CSE
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In this lesson, Roman has shed light upon the Chapter 9 of Class 6 Science NCERT, which majorly deals with the concepts related to living organisms and their surrounding. One will come across the summary of adaptation and habitat of various living organisms. Then he takes up the topic, crieteria of being alive and throws light on terms such as Respiration, Response to Stimulus, Excretion, Reproduction, and Movement. Lastly, he has discussed some of the organisms like Virus, Euglena, Archaea, and Sulfur bacteria, which have no clear classification.

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.
U
Unacademy user
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WRITING A SHORT NOTE AND U EXPLANING IS MUCH BETTER sir
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please do continue this course for further classes. I know other educators have done that but you explain completely and most of the stuff stuck in mind. Please continue
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HERE IS ANOTHER AWESOME LESSON FROM THE PUREST OF THE PURE SOUL ON THIS PLANET EARTH.....LONG LIVE ROMAN SIR...AND LONG LIVE UNACADEMY TEAM.... FEELING BLESSED TO BE BORN IN ''ROMAN ERA''....THANK U IS NOT THE WORD...SALUTE TO ALL MOTERS OF FOUNDING FATHERS AND GREAT EDUCATORS AND OTHER CONTRIBUTORS OF UNACADEMY...
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Where is the contribute button sir ?
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Shaurya Garg
a month ago
It's in the app not on the website.
No words ....THank you falls short of appreciation but for the time being..Many many thanks
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  1. Lorem Ipsum Dolor Class 6 Science NCERT Part 4: Chapter 9 Presented by Dr. Romar Saini


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


  3. Kevwords and summary


  4. Chapter 9: Living organisms and their surrounding Organisms live in habitat and are adapted to it. Ex: Saline, desert, ocean, normal land, forests s Adaptation : Specific features or practices which improves the probability of survival of an organisms in his surrounding. 100s to 1000s of years Desert: Camels- long legs keep it away from sand heat, no sweat, highly concentrated urine, dry dung; snakes etc.- deep burrows. Cactus: leaves modified into spines (reduce transpiration losses), thick waxy fleshy green stem for photosynthesis, deep roots


  5. * Ocean: Streamlining, gills, oil, slippery fins, flat fins and tails, In sea, they use dissolved oxygen, squids and octopus make themselves streamline while moving. Dolphins and whales: no gills as they are mammals (nostrils or blowholes on upper part of their head). They go near surface to breathe from time to time, else they ill die. Lakes: Roots are just to hold it in place, stems are long, hollow and light, grows till the surface, leaves and flowers float on the surface of water Totally submerged plants: Narrow and thin, ribbon like leaves or highly divided leaves, so that strong current can just pass through them. Frogs: strong legs, webbed feet


  6. seed sprouting: germinating Habitat surroundings where organisms live, terrestrial and aquatic; biotic and abiotic component (air, light, temperature, soil) s High mountains: Cold, windy, snowfall Tree: cone shaped, needle like leaves, sloping branches (rainwater and snow slides, rather than staying) Animals: thick skin, fur with long hairs, strong hooves (mountain goats, climbing orn rocks) Grasslands: Predators like lion-light brown color, camouflage, withdrawing of claws in toes, eyes placed in front (better estimate of prey's location) Prey like deer: fast and light, strong teeth for chewing on stems, eyes placed on side, long ears to hear the movement.


  7. Criteria of being alive Food/ source of energy Growth Respiration (not breathing) : Physiological and cellular respiration Earthworm- skin, Fish - gills (dissolved oxygen in water), plants - stomata helps in exchange of gases (night time usually), oxygen consumed during respiration is much less than oxygen release during photosynthesis Response to environmental change (stimulus) reflexes and conscious response, Mimosa pudica (touch-me-not), sunflower responds to sunlight Animals run away on flashing light, Cockroach hide if light is flashed


  8. Criteria of being alive Excretion: Removal of waste products, preset in food and otherwise generated in metabolic reactions. Ex: Sweat, feces, urine, skin secretions, respiration Plants either secret out in form of resins, latex, gum or store in secluded part. Reproduction: procreation + biological process leading to new individual organisms (offspring) + produced from parents. Ex: Eggs, seeds, cuttings, live births Movement: from one place to other, or in plants: over and under the ground, with intra-organismic transfer of water, nutrients, food, minerals etoc.


  9. Exceptions with no clear classification Virus: organisms at the edge of life Euglena: Both plant (autotroph) and animal (heterotroph) like features Archaea: Neither bacteria nor eukaryotes. Extremophiles. Ex: methanogens Sulfur bacteria: Oxidise sulfur (oxygen will kill them instantly) Archaea: Neither bacteria nor eukaryotes Extremophiles Ex: methanogens


  10. Summary: Living beings need food, respire, respond to stimuli reproduce, show movement, grow and die