\n(iii) There is very little intercellular space.<\/td>\n There is no intercellular space at all.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nAnswer 8. \nMass of hammer, m = 500 g = 0.5 kg \nInitial velocity of hammer, u = 50 ms-1<\/sup> \nFinal velocity of hammer, v = 0 and time, t = 0.01 s \n \n-ve sign of the force suggests that the force is opposing the motion of hammer. \n\u2234 Force applied by the nail on hammer = 2500 N<\/p>\nAnswer 9. \nEffects of using manures on soil quality:<\/strong><\/p>\n\nManures enrich the soil with nutrients and provide a lot of organic matter (humus) to the soil and thus restores water retention capacity of sandy soils and drainage capacity in clayey soil.<\/li>\n The addition of manures reduces the chances of soil erosion.<\/li>\n They provide food for the soil organisms, like soil friendly bacteria.<\/li>\n<\/ul>\nEffects of using fertilisers on soil quality:<\/strong><\/p>\n\nBy continuous use of fertilisers, soil can become powdery, dry and the chances of soil erosion increases.<\/li>\n By the use of fertilisers, the organic matter decreases which further decreases the porosity of soil and plant roots planted in the soil do not get oxygen properly.<\/li>\n The nature of soil turns to acidic or basic unnecessarily and it can harm the soil organisms.<\/li>\n<\/ul>\nAnswer 10.<\/p>\n
\nAves\/birds can fly.<\/li>\n Hollow and light bones.<\/li>\n Streamlined body and forelimbs are modified into wings.<\/li>\n Warm-blooded animals, heart with four chambers.<\/li>\n Egg laying animals.<\/li>\n Beaks present, teeth are absent.<\/li>\n<\/ul>\nOR<\/strong><\/p>\n\nPresence of notochord\/ dorsal nerve chord\/ paired gill pouches\/ have a bilaterally symmetrical body\/ are triploblastic\/ are coelomate. (any two)<\/li>\n \n\nClass pisces<\/li>\n Class Reptilia<\/li>\n<\/ol>\n<\/li>\n<\/ol>\nAnswer 11. \nAs, X on heating gives two new substances Y and Z. \nTherefore, X is a compound<\/p>\n
\nElements are made up of only one kind of atoms like gold, iron while compounds are made up of two or more kinds of atoms combined together in a definite proportion.<\/li>\n Elements cannot be broken down into simpler substances by chemical reactions. However, compound during chemical reaction can break into simpler substances.<\/li>\n<\/ol>\nAnswer 12. \n(a)<\/strong> Every object in this universe continues to be in its state of rest or of uniform motion in a straight line, unless acted upon by some external unbalanced force to change that state. \n(b)<\/strong> Case I:<\/strong> Object will remain static because of equal and opposite forces acting upon it. \nCase II:<\/strong> Object will move towards left in the direction of 25 N force. This is because an unbalanced force of 25 – 15 = 10 N is acting in this direction. \nOR<\/strong><\/p>\nEvery object in this universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. This force is along the line joining the centres of the two objects. \nF = G.\\(\\frac { Mm }{ { d }^{ 2 } } \\) \nWhere F = Force; Mm = Product of two masses \nd = Distance between the centres of two objects \nG = Universal Gravitation constant = 6.67\u00a0\u00d7 10-11<\/sup> Nm2<\/sup> kg-2<\/sup> \nPhenomena which were explained on the basis of universal law of Gravitation:<\/p>\n\nThe force that binds us to the earth.<\/li>\n The motion of moon around the earth.<\/li>\n The motion of planets around the sun.<\/li>\n The formation of tides due to the moon and the sun. (any two)<\/li>\n<\/ul>\nAnswer 13.<\/p>\n
\nHigh yield<\/li>\n Improved quality<\/li>\n Biotic and abiotic resistance.<\/li>\n Change in maturity duration.<\/li>\n Wider adaptability.<\/li>\n Desirable agronomic characteristics.<\/li>\n Development of novel varieties, (any six)<\/li>\n<\/ul>\nAnswer 14.<\/p>\n
\nThrough cuts and wounds (Tetanus)<\/li>\n Through contaminated food and water (Cholera)<\/li>\n Through sexual contact (AIDS, Syphillis)<\/li>\n Through air (TB, Pneumonia)<\/li>\n Through direct skin contact (Ring worm) (any three)<\/li>\n<\/ul>\nAnswer 15.<\/p>\n
\nAluminium sulphate: \n <\/li>\n Homo-diatomic molecule – O2<\/sub>\/H2<\/sub>\/N2<\/sub> \nHomo-tetratomic molecule – P4<\/sub>.<\/li>\n<\/ol>\nAnswer 16.<\/p>\n
\nThe change in the state of matter from liquid to gas is called evaporation. \nCotton is a good absorber of water than that of Nylon. So, during summers cotton clothes absorb sweat, which on evaporation causes cooling effect to the body.<\/li>\n They are not exactly the same. Boiling of liquid takes place at its boiling point, whereas evaporation can occur at any temperature or room temperature. Evaporation is a surface phonemenon while boiling is a bulk phenomenon.<\/li>\n<\/ol>\nAnswer 17. \n1.<\/strong> Genetically modified crop:<\/strong> In this method, a gene that would provide the desired characteristics is introduced into the crop. The crop so obtained is called genetically modified crop. \n2.<\/strong> Some of the factors for which crop variety improvement is done are:<\/p>\n\nHigher Yield:<\/strong> Variety improvement has been done to increase the productivity of the crop per acre of cultivated land. This is very important in order to meet the food demand for rapidly growing population.<\/li>\nImproved Quality:<\/strong> The definition of quality is different for different crops, e.g. baking quality is important in wheat, protein quality in pulses, oil quality in oil seeds and preserving qualities in fruits and vegetable.<\/li>\nWider Adaptability:<\/strong> Varieties that can grow under any condition and can adapt themselves to various environmental conditions, help in stabilising the crop production.<\/li>\nBiotic and Abiotic Resistance:<\/strong> Biotic factors like (pathogens, insects and nematodes) and abiotic factors (drought, salinity, water logging, heat cold and frost) affects crop production to a great extent. Varieties resistant to such factors are always preferred and improves the crop production.<\/li>\n<\/ol>\n3.<\/strong> Two ways to control weeds:<\/p>\n\nPreventive methods:<\/strong> Proper seed bed preparation, timely sowing of crops, intercropping and crop rotation.<\/li>\nChemical methods:<\/strong> Spraying of herbicides or weedicides, e.g. Atrazine 2, 4 – D.<\/li>\n<\/ol>\nAnswer 18.<\/p>\n
\nIt is the tendency of a body to remain in its state of rest or of uniform motion in a straight line. Quantity that measure it is mass.<\/li>\n While alighting from the moving bus, the feet of the person will suddenly come to rest while rest of the body is in the state of motion due to inertia of motion and hence the person may fall down and may get injured.<\/li>\n a = 2 m\/s2<\/sup>; m= 12.5 kg \nF = m\u00a0\u00d7 a \n= 2\u00a0\u00d7 12.5 = 25 N<\/li>\n<\/ol>\nAnswer 19. \n1. Rutherford\u2019s scattering experiment:<\/strong> He selected a very thin gold foil to be bombarded with fast moving \u03b1-particles – which are doubly positively charged \u2018He\u2019 ions. \nThe fast moving a-particles have a considerable amount of K. E. to hit the gold atoms. \nObservations:<\/strong><\/p>\n\nMost of the \u03b1-particles passed straight through the foil without any deflection.<\/li>\n One out of 12,000 particles appeared to rebound.<\/li>\n<\/ul>\nInference:<\/strong><\/p>\n\nThere is a positive centre inside the atom at the centre, called nucleus.<\/li>\n The electrons revolve around the nucleus in well defined orbits.<\/li>\n The size of the nucleus is very small as compared to the size of the atom.<\/li>\n<\/ul>\n2.<\/strong> Atomic number is 17 \nElement is chlorine 1 \nElectronic configuration – 2, 8, 7; valency – 1<\/p>\nAnswer 20. \n(a)<\/strong> \n \n(b)<\/strong><\/p>\n\nBy the conversion of CO2<\/sub> into glucose by green plants in the presence of sunlight during photosynthesis.<\/li>\nUsage of carbonates dissolved in sea-water by marine animals to make their shells.<\/li>\n<\/ul>\nOR<\/strong><\/p>\n\nOzone is a molecule of oxygen with three atoms of oxygen, O3<\/sub>.<\/li>\nIt covers the Earth\u2019s atmosphere and is present in the stratosphere. It does not allow the harmful ultra-violet radiations coming from the sun to reach our Earth surface.<\/li>\n These ultra-violet radiations cause ionising effect, can cause cancer and genetic disorder in any life-forms.<\/li>\n The ozone is getting depleted at the south pole near Antartica. The ozone depletion is due to the halogens like CFC (chlorofluorocarbon) released in the air.<\/li>\n Chlorine and fluorine reacts with the ozone and splits it, thereby leading to formation of a big hole called ozone hole.<\/li>\n Thus, we need to protect the ozone layer from getting depleted by reducing the consumption of fossil-fuels and other factors which leads to the depletion of ozone layer. \n <\/li>\n<\/ul>\nAnswer 21. \nDifferent crops require different climatic conditions, temperature and photoperiods for their growth. Photoperiods are related to sunlight and ultimately with weather. Some crops grow well in rainy season (Kharif crops) while others grow well in winter season (Rabi crops). \nAlso, because weather conditions such as occurence of droughts and flood situations are unpredictable, varieties that can be grown in diverse climatic conditions are useful. \nFactors (any three):<\/strong><\/p>\n\nHigher yield<\/li>\n Improved quality<\/li>\n Biotic and Abiotic resistance<\/li>\n Change in maturity<\/li>\n Wider adaptability<\/li>\n Desirable agronomic characteristics.<\/li>\n<\/ul>\nSECTION-B<\/strong><\/p>\nAnswer 22.<\/p>\n
\nThe sound waves with frequency less than 20 Hz is called infrasound.<\/li>\n The sound waves with frequency higher than 20 kHz is called ultrasound.<\/li>\n<\/ul>\nAnswer 23.<\/p>\n
\nThe measuring cylinder should be placed on a plain flat surface.<\/li>\n The lower meniscus and eyeline should be parallel.<\/li>\n<\/ol>\nAnswer 24.<\/p>\n
\nPlant root cells absorb water by osmosis.<\/li>\n The unicellular organisms like amoeba takes in the required material by osmosis.<\/li>\n<\/ol>\nAnswer 25. \n20 mL – 10 mL = 10 mL \n\u2235 5\u00a0\u00d7 2 = 10 \nEach mark is of 2 mL value.<\/p>\n
Answer 26.<\/p>\n
\nThe fibrous roots in monocot plants are short, gives less nutrient to the plant, during spring when leaves are shed.<\/li>\n Bulbs present in the roots of monocot plants store food and supply it to the plant.<\/li>\n<\/ul>\nAnswer 27. \nMass of solute = 40g \nMass of solvent = 280 g \nMass of solution = Mass of solute + Mass of solvent \n= 40 g + 280 g \n= 320 g \nMass percentage of solution \n <\/p>\n
We hope the CBSE Sample Papers for Class 9 Science Paper 3 help you. If you have any query regarding CBSE Sample Papers for Class 9 Science Paper 3, drop a comment below and we will get back to you at the earliest.<\/p>\n","protected":false},"excerpt":{"rendered":"
CBSE Sample Papers for Class 9 Science Paper 3 are part of CBSE Sample Papers for Class 9 Science. Here we have given CBSE Sample Papers for Class 9 Science Paper 3. CBSE Sample Papers for Class 9 Science Paper 3 Board CBSE Class IX Subject Science Sample Paper Set Paper 3 Category CBSE Sample … Read more<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[6805],"tags":[],"yoast_head":"\nCBSE Sample Papers for Class 9 Science Paper 3 - CBSE Library<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n