(Summative Assessment - I) Time : 3 Hrs. Maximum Marks : 90

Transcription

1 science & technology (Summative Assessment - I) Time : 3 Hrs. Maximum Marks : 90 General Instructions :. The question paper consists of 2 sections Section A (having 27 questions) and Section B (having 2 questions). You are to attempt both the sections. 2. All questions are compulsory. 3. There is no overall choice. However, internal choices have been provided in 3 questions of 2/3 marks category and all the 6 questions of 5 marks each. 4. All questions of Section A and Section B are to be attempted separately. 5. Questions to 4 in Section A and Questions 28 & 29 in Section B are multiple choice type questions and carry one mark each. 6. Questions 5 to 0 in Section A and Questions 30 & 32 in Section B are very short answer type question and carry mark each. 7. Questions -6 in Section A and question 33 to 35 are short answer type questions and carry 2 marks each. 8. Question 7 to 23 in Section A, and Question 36 and 37 in Section B, are also short answer type questions and carry 3 marks each. 9. Question 24 to 27 in Section A, and Question 38 and 39 in Section B, are long answer type questions and carry 5 marks each. lkeku; funsz'k % - bl iz'u i=k nks [kam gsaµ[k.m ^v* (ftlesa 27 iz'u gsa) vksj [k.m ^c* (ftlesaa 2 iz'u gsa)a vki dks nksuksaa gh [k.mksa osq iz'u djus gsaa 2- lhkh iz'u vfuok;z gsaa 3- lkefxzd fodyi ugha fn;k x;k gsa rfkkfi 5 vad dh Js.kh osq lhkh N% iz'uksa rfkk 2@3 vad dh Js.kh osq 3 iz'ukasa esaa vkarfjd fodyi iznku fd, x, gsaa 4- [kam ^v* osq lhkh iz'u vksj [kam ^c* osq lhkh iz'u vyx&vyx djus gsaa 5- [kam ^v* esa iz-la- ls 4 rfkk [kam ^c* esa iz-la- 28 vksj 29 cgq&osdfyid iz'u gsa,oa buesa ls izr;sd dk vad gsa 6- [kam ^v* esa iz-la- 5 ls 0 rfkk [kam ^c* esa iz-la- 30 ls 32 vfr y?kwùkjkred iz'u gsa,oa buesa ls izr;sd dk vad gsa 7- [kam ^v* esa iz-la- ls 6 rfkk [kam ^c* esa iz-la- 33 vksj 35 y?kwùkjkred iz'u gsa,oa buesa ls izr;sd iz'u 2 vadksa dk gsa 8- [kam ^v* esa iz-la- 7 ls 23 rfkk [kam ^c* esa iz-la- 36 vksj 37 Hkh y?kqùkjkred iz'u gsa,oa buesa ls izr;sd iz'u 3 vadksa dk gsa 9- [kam v* esa iz-la- 24 ls 27 rfkk [kam ^c* esa iz-la- 38 vksj 39 nh?kz mùkjkred iz'u gsa,oa buesa ls izr;sd 5 vadksa dk gsa [59]

2 section - a ([kam&v). We connect a torch bulb and a battery of two cells of.5v each using copper connecting wires. We dip the free ends of the two wires of the tester in four different liquids. The liquid in which the bulb will not glow is : (a) lime juice (c) orange juice (b) distilled water (d) Vinegar ge,d VkSpZ cyc rfkk -5v izr;sd ds nks lsyksa dh csvjh dks dkwij la;kstu rkjksa ls la;ksftr djrs gsaa VsLVj dh rkjksa ds [kqys fljksa dks pkj fofhkuu nzoksa esa Mqcks;k tkrk gsa og nzo ftlesa Mqcksus ij cyc ugha pedsxk og gs %& (a) uhacw dk jl (b) vklqr ty (c) larjs dk jl (d) fljdk 2. The relation between different types of friction is (a) Static friction > Rolling friction > Sliding friction (b) Static friction = Sliding friction > Rolling friction (c) Rolling friction > Static friction > Sliding friction (d) Static friction > sliding friction > Rolling friction fofhkuu izdkj ds?k"kz.kksa esa lacaèk gksrk gs %& (a) LFkSfrd?k"kZ.k > yksvfud?k"kz.k > lihz?k"kz.k (b) LFkSfrd?k"kZ.k ¾ lihz?k"kz.k > yksvfud?k"kz.k (c) yksvfud?k"kz.k > LFkSfrd?k"kZ.k > lihz?k"kz.k (d) LFkSfrd?k"kZ.k > lihz?k"kz.k > yksvfud?k"kz.k 3. Combustible material is heated in the presence of air or oxygen it- (a) does not catch fire (b) produces only heat (c) produces only light (d) Catches fire easily and produces heat and light. tc fdlh Toyu'khy inkfkz dks vkwdlhtu dh miflfkfr esa xez fd;k tkrk gs rks ;g %& (a) vkx ugha idm+rk gsa (b) dsoy Å"ek nsrk gsa (c) dsoy izdk'k nsrk gsa (d) vklkuh ls vkx idm+dj] Å"ek,oa izdk'k nsrk gsa [60]

3 4. An air pollutant, which when inhaled forms a complex compound that makes haemoglobin unable to transport oxygen to various parts of the body is :- (a) CFC (c) Nitrogen dioxide (b) Smog (d) Carbon monoxide,d ok;q iznw"kd tks lakl ds lkfk vanj fy, tkus ij fgeksxyksfcu ds lkfk tfvy ;ksfxd cukrk gs ftlds dkj.k fgeksxyksfcu 'kjhj ds fofhkuu Hkkxksa esa vkwdlhtu dk izokg ugha dj ikrk og gs %& (a) lh,iq lh (b) LekWx (c) ukbvªkstu MkbZvkDlkbM (d) dkczu eksuksvkwdlkbm 5. Amit and Bhanu are applying forces on two opposite sides of a moving object. The object still moves with the same speed in the same direction. What will be the magnitude of both the forces applied. vfer rfkk Hkkuq fdlh xfr'khy olrq dh foijhr lkbmksa ij cy yxk jgs gsaa olrq vc Hkh mlh pky rfkk mlh fn'kk esa xfr'khy gsa yxk, x, nksuksa cyksa dk ifjek.k D;k gksxk\ 6. The vigorous rubbing of our palms together for a few minutes, makes them warm. Give reason. gkfkksa dks dqn feuv rd rsth ls jxm+us ij vki xjeh vuqhko djrs gsaa dkj.k fyf[k,a 7. When electricity is passed through an electrolyte some chemical changes occur. Name the phenomenun and the scientist who discovered it. tc fo qr vi?kv~; esa fo qr izokfgr dh tkrh gs rks dqn jklk;fud ifjorzu?kvrs gsaa bl ifj?kvuk rfkk ml oskkfud dk uke fyf[k, ftlus bldh [kkst dha 8. Wind, Sun, bio mass from plants and hydropower from water are (natural / synthetic) and (exhaustible / in exhaustible) sources of energy. [Fill in with the correct option] iou ÅtkZ ds lw;z iks/ksa }kjk ckw;ksekl rfkk ty ls izkir ty'kfdr (izkñfrd@ñf=ke),oa ({k;@v{k;) lalk/u gsaa (lgh fodyi ls fjdr LFkku Hkjsa) [6] ½+½=

4 9. Out of two areas one with heavy traffic and another a residential area with park, where are you more likely to get burning sensation in your eyes / nose and why? vr;kf/d ;krk;kr ls ;qdr {ks=k vfkok ikdz ls layxu vkoklh; {ks=kksa esa ls fdl {ks=k esa vkidh vk [kksa vksj ukd esa tyu dh vuqhkwfr gks ldrh gs vksj D;ksa\ 0. A piece of paper burns quickly as compared to a piece of wood. Explain. dkxt dk,d VqdM+k,d ydm+h ds VqdM+s dh vis{kk tynh vkx idm+rk gsa Li"V dhft,a. Explain why the shape of sports car is generally more pointed towards the front. Li"V dhft, fd f[kykm+h dkj dk vkdkj lkeku;r% vkxs dh vksj vf/d uqdhyk D;ksa gksrk gsa 2. How do moving tectonic plates cause an earthquake? i`foh dh IyksVksa dh xfr fdl izdkj HkwoaQi mriuu djrh gs\ 3. A man drops from a moving aeroplane and opens his parachute (a) Name the force which is responsible for his downward motion. (b) Is the upward force acting on the man is longer or smaller than the downward force acting on it.,d O;fDr mm+rs gq, ok;q;ku ls dwnrk gs vksj viuk isjk'kwv [kksyrk gsa (i) mlds uhps dh vksj xfr ds fy, mùkjnk;h cy dk uke fyf[k,a (ii) D;k O;fDr ij Åij dh vksj yxus okyk cy uhps dh vksj yxus okys cy ls vf/d gs vfkok de gs\ 4. How is combustion of a cracker different from combustion of Sodium? (Write two points) ivk[ks dk ngu lksfm;e ds ngu ls fdl izdkj fhkuu gs\ (nks fcanq fyf[k,) 5. No one is allowed to take any burning material within the premises of petrol stations and LPG godowns. Give Reason. Mention two other places where the same precaution should be taken. isvªksy iei rfkk LPG xksnke ds ifjlj esa fdlh Hkh O;fDr dks tyrk gqvk inkfkz ys tkus dh vuqefr ugha gksrha dkj.k fyf[k,a nks vu; LFkkuksa ds uke fyf[k, tgka blh izdkj dh lko/kuh yh tkuh pkfg,a ½+½= ½+½=2 [62]

5 6. Some gases in atmosphere have the capacity to trap heat radiations. (i) Write the names of any two such gases. (ii) What can be the major hazard of trapping heat radiations by these gases. +½+½=2 ok;qeamy esa fo eku dqn xslksa esa Å"ek fofdj.kksa dks iaqlkus dh {kerk gksrh gsa (i) bl çdkj dh fdugha nks xslksa ds uke fyf[k,a (ii) bu xslksa }kjk Å"ek fofdj.kksa dks iqalkus dk Hk;adj ifj.kke D;k gks ldrk gs\ 7. (a) It is much easier to burst an inflated balloon with a needle than by a finger. Give reason. (b) State the effect of force that is associated with the following activities :- (i) A potter making pots. (ii) A goal keeper saving a goal, by kicking the ball away. (iii) A batsman hitting a cricket ball for a sixer (iv) A player taking a catch. (a) dkj.k crkb, %,d iwqys gq, xqcckjs dks,d maxyh ls iqksmus dh vis{kk,d lqbz ls iqksm+uk ljy gsa (b) fueu fø;k, cy ds dksu ls izhkko ls lac¼ gsa & (i),d dqegkj dk feêðh ds ik=k cukuka (ii),d xksy j{kd dk xksy dks cpkus ds fy;s xsan dks nwljh rjiq isaqd nsuka (iii),d cyysckt dk NDdk ekjus ds fy, fødsv dh xsan dks csv ls fgv djuka (iv),d f[kykm+h dk dsp idm+uka 8. During an experiment an electromagnetic induction, state what happens when :- (a) the magnet and the coil are at rest with respect to each other. (b) magnet is moved away from the coil. (c) The relative motion between the magnet and the coil is faster. os qr pqecdh; izsj.k ij iz;ksx ds nksjku D;k gksrk gs tc %& (i) dqamyh dks pqecd ds lkis{k flfkj j[kk tkrk gsa (ii) pqecd dks dqamyh ls nwj ys tk;k tkrk gsa (iii)pqecd rfkk dqamyh ds eè; vkisf{kd xfr rst dh tkrh gsa 3 3 [63]

6 OR (vfkok) (a) State the type of energy conversion that occurs in a voltaic cell. (b) Name the two metallic electrodes used in the voltaic cell. (c) Define the term strong electrolyte. Write one example. (a) oksyvsbd lsy esa?kvus okys ÅtkZ :ikurj.k dk izdkj O;Dr dhft,a (b) oksyvsbd lsy esa mi;ksx gksus okys nks /kfrod bysdvªksmksa ds uke fyf[k,a (c) in izcy fo qr vi?kv~; dks ifjhkkf"kr dhft, rfkk,d mnkgj.k fyf[k,a 9. Write any three effects of chemical reactions that occur at electrodes and within the electrolyte during the process of electrolysis. fo qr vi?kvu izfø;k ds nksjku bysdvªksmksa ij rfkk os qr vi?kv~; esa jklk;fud vfhkfø;kvksa ds dksbz rhu izhkko fyf[k,a 20. (a) Explain how you can get a reddish copper coating on the zinc plate. (b) Draw a well labelled diagram of this apparatus. What is this process called? (a) Li"V dhft, fd vki ftad IysV ij jdrkhk dkwij dh ijr fdl izdkj izkir dj ldrs gsa\ (b) midj.k dk Hkyh Hkkafr ukekafdr vkjs[k [khafp,a bl izfø;k dks D;k dgk tkrk gs\ Alternative question for visually challenged students in lieu of Q. No. 20(b). ç-la- 20(b) ds LFkku ij n`f"v jfgr fo kffkz;ksa ds fy, osdfyid iz'ua (a) Write one more industrial application of chemical effect of electric current other than mentioned above. (a) Åij fn, x, ds vfrfjdr fo qr /kjk ds jklk;fud izhkko dk,d vksj vks ksfxd vuqiz;ksx fyf[k,a 2. Anu visited his maternal Grand Father who lives at a place 'X' which lies in seismic zone. She observed that construction of his new house was going on in full swing. She advised her grand father to make use of lighter material to make the building earthquake safe. Her grandfather felt very proud of her. 3 3 [64]

7 (a) Write any two values displayed by Anu. (b) Write any two safety precautions that should be taken after an eqrthquake. vuq vius ukukth ls feyus xbza mlds ukukth ftl LFkku ^X* esa jgrs gsa og HkwdEih {ks=k gsa mlus izsf{kr fd;k fd muds Hkou dk fuekz.k cgqr rst+k xfr ls gks jgk FkkA mlus vius ukuk th dks lq>ko fn;k fd Hkou dks HkwdEi ds izhkko ls lqjf{kr j[kus ds fy, mugas gyds inkfkks± dk mi;ksx djuk pkfg,a mlds ukuk th dks ml ij xoz dk vuqhko gqvka (a) vuq }kjk iznf'kzr dksbz nks ewy; fyf[k,a (b) HkwdEi ds i'pkr~ yh tkus okyh dksbz nks lqj{kk lkoèkkfu;ksa ds ckjs esa fyf[k,a 22. (a) Name the fossil fuel which is found, along with petroleum is oil wells? (b) Name its two major sources in India. (c) State one use of this fuel. (d) Why is this fuel called a cleaner fuel? (a) rsy ds dqvksa esa isvªksfy;e ds lkfk ik;s tkus okys,d thok'e b±èku dk uke fyf[k,a (b) Hkkjr esa blds nks eq[; L=kksrksa ds uke fyf[k,a (c) bl b±èku dk,d mi;ksx fyf[k,a (d) bl b±èku dks LoPN b±/u D;ksa dgk tkrk gs\ 23. (a) State any two ill-effects of acid rain. (b) Mention two ways of controlling vehicular pollution. (a) veyh; o"kkz ds fdugha nks dqizhkkoksa dks O;Dr dhft,a (b) okguh; iznw"k.k dks fu;fu=kr djus dh nks fof/;ksa dk myys[k dhft,a 24. (a) Define hydrostatic pressure. (b) What will be the magnitude of pressure at the points A, B, C and D in the containers shown in the figure below. Justify your answer. +2 ½+½+½ + ½+=3 +2 [65]

8 (c) State two properties of liquid pressure that are associated with the following. 5 (i) (ii) (a) flfkj tyh; nkc dh ifjhkk"kk fyf[k,a (b) uhps fn, x, pkj ik=kksa ds vkjs[kksa esa fcanqvksa A, B, C rfkk D ij nkc dk ifjek.k D;k gksxk\ vius mùkj dh iqf"v dhft,a (c) fueu izr;sd ls lac¼ rjyh; nkc ds nks xq.k fyf[k,a Alternative question for visually challenged students in lieu of Q. No. 24. (b) and (c) ç-la- 24 (b),oa (c) ds LFkku ij n`f"v jfgr fo kffkz;ksa ds fy, osdfyid iz'ua (b) A conical flask, arrow cylindrical, a broad cylindrical and round bottom flask are filled with water upto the same height. What will be the magnitude of pressure at the points A, B, C and D which are located at the bottom of each container respectively. Justify your answer. (c) State any two properties of liquid pressure. (b),d 'kadokdkj ÝykLd,d iryk csyukdkj],d pksm+k csyukdkj rfkk,d xksy rys dk ÝykLd izr;sd dks leku ÅapkbZ rd ty ls Hkjk x;k gsa Øe'k% izr;sd ik=k dh ryh ij voflfkr fcanqvksa A, B, C rfkk D ij nkc ds ifjek.k D;k gksaxs\ (c) rjyh; nkc ds dksbz nks xq.k fyf[k,a [66]

9 OR (vfkok) (a) Put a ping pong ball inside the wide part of a funnel and blow hard into the narrow end. Why doesn't the ball pop out? (b) Why does the number of storms increase during the summer season. (c) Blow up two balloons and attach a piece of spring to each. Hold one balloon by the swing in each hand so that they are 6 inches apart. Blow hard into the space between the balloons. Will both the balloons come closer to each other or will they move away from each other. Give reason fo your answer. (a) fdlh dhi ds pksm+s Hkkx esa fiax iksax ckwy jf[k, rfkk irys fljs ds uhps dh vksj ls rst iwqad ekfj,a ckwy mnydj ckgj D;ksa ugha fxjrh gs\ (b) xzh"e ½rq esa rwiqkuksa dh la[;k c<+ D;ksa tkrh gs\ (c) nks xqcckjs iqqykdj izr;sd dks Mksjh ls cka/ yhft,a nksuksa gkfkksa esa xqcckjs bl izdkj idfm+, fd os,d nwljs ls N% bap dh nwjh ij gksaa xqcckjksa ds eè; LFkku esa rst iwaqd ekfj, D;k nksuksa xqcckjs,d nwljs ds fudv vk,axs vfkok,d nwljs ls nwj gks tk,axsa vius mùkj ds lefkzu esa dkj.k fyf[k,a 25. (a) State two reasons each for the following :- (i) Automobile tyres have treades on them? (ii) Talcum powder is sprinkled on a Carrom-board? (b) On What principle do ball - bearings work? (a) fueufyf[kr izr;sd ds fy, nks dkj.k fyf[k, %& (i) Lopkfyr okguksa ds Vk;j [kkapsnkj gksrs gsa\ (ii) dsje&cksmz ij ikmmj fnm+dk tkrk gs\ (b) cky cs;fjax fdl fl¼kar ij dk;z djrs gsa\ OR (vfkok) (a) Imagine that an object is falling through a long straight glass tube held vertical, air has been completely removed from the tube. The object does not touch the wall of the tube. Will the object experience any force of friction? (b) Name the force of friction between the wheels of a moving train =5 [67]

10 and iron rails? If an air cushion is introduced between the wheel and the rail, what effect will it have on the friction? (c) Two identical metal sheets are taken. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other give reason. (a) eku yhft, dksbz olrq ÅèokZèkj idm+h gqbz yech ljy dkap dh V~;wc esa ftldks iw.kz :i ls fuokzr fd;k x;k gs] esa fxj jgh gsa olrq V~;wc dh nhokjksa dks ugha Nwrh gsa D;k olrq?k"kz.k cy dk vuqhko djsxh\ (b) xfr'khy jsyxkm+h rfkk jsy dh ivjh ds eè;?k"kz.k cy dk uke fyf[k,a ;fn ifg, rfkk ivjh ds chp ok;q dq'ku yxk fn;k tk, rks bldk?k"kz.k ij D;k izhkko im+sxk\ (c) nks,d leku /krq dh 'khv yh xbz gsaa buesa ls,d dks jsxeky ls jxm+k tkrk gs rfkk nwljh dks lk/kj.k isij lsa jsxeky ls jxm+h tkus okyh 'khv vu; 'khv dh vis{kk vf/d pedrh gsa dkj.k fyf[k,a 26. (a) Why is burning of wood undesirable? (b) How are different varities of Coal formed? (c) Name four varities of coal (d) State one use of coaltar. (a) ydm+h dk tykuk vokanuh; D;ksa gs\ (b) dks;ys dh fofhkuu fdlesa fdl izdkj izkir gksrh gs\ (c) dks;ys dh pkj fdleksa ds uke fyf[k,a (d) dksyrkj dk,d mi;ksx fyf[k,a OR (vfkok) (a) With the help of diagram, show the occurence of petroleum. (b) Why petroleum should be refined? (c) Name the petroleum product which is used as a fuel in (i) boilers (ii) aeroplanes (a) vkjs[k dh lgk;rk ls isvªksfy;e dh izkfir iznf'kzr dhft,a (b) isvªksfy;e dks ifj"ñr D;ksa fd;k tkuk pkfg,\ (c) isvªksfy;e ds mu mriknksa ds uke fyf[k, ftudk mi;ksx (i) DoFkfu=kksa (ck;yjks) (ii) ok;q;kuksa esa b±èku ds :i esa fd;k tkrk gsa 5 3++½ +½=5 [68]

11 Alternative question for visually challenged students in lieu of Q. No. 26(a). ç-la- 26 (a) ds LFkku ij n`f"v jfgr fo kffkz;ksa ds fy, osdfyid iz'ua (a) Explain the occurence of petroleum. (a) isvªksfy;e dh izkfir le>kb,a 27. (a) Define 'Flame'. (b) Name the zone of flame which is : (i) zone of complete combustion (ii) coldest (c) With the help of activity show the presence of wax vapours in innermost zone of flame. (a) Tokyk dks ifjhkkf"kr dhft,a (b) Tokyk ds ml {ks=k dk uke fyf[k, tks & (i) iw.kz ngu dk {ks=k gsa (ii) lcls vf/d 'khr gsa (c),d fø;kdyki dh lgk;rk ls Tokyk ds lcls vanj ds Hkkx esa ekse ok"iksa dh miflfkfr iznf'kzr dhft,a Alternative question for visually challenged students in lieu of Q. No. 27(c). ç-la- 27(c) ds LFkku ij n`f"v jfgr fo kffkz;ksa ds fy, osdfyid iz'ua (c) Explain an activity that confrims the presence of wax vapours in innermost zone of flame. (c),d fø;kdyki le>kb, tks ;g lqfuf'pr djrk gs fd Tokyk ds lcls vanj ds Hkkx esa ekse ok"i miflfkr gksrs gsaa OR (vfkok) (a) Increased fuel consumption has led to harmful effects on the environment. Justify this statement. (b) Calonfic value of wood is 20,000 KJ/kg. If Rani requires 80,000 KJ of energy to cook food on a chulha, how much wood will she require? (c) Wood is not considered a good fuel. Give any two reasons for this statement. +½+ ½+3 = 5 [69]

12 (a) b±èku dh [kir esa o`f¼ ds dkj.k i;kzoj.k ij gkfudkjd izhkko im+k gsa bl dfku dh iqf"v dhft,a (b) ydm+h dk Å"eh; eku 20]000 KJ/kg gsa ;fn jkuh dks pqygs ij [kkuk idkus ds fy, 80]000 KJ/kg ÅtkZ dh vko';drk gs rks mls fdruh ydfm+;ksa dh vko';drk gksxh\ (c) ydm+h dks vpnk b±èku ugha ekuk tkrk gsa bl dfku ds fy, dksbz nks dkj.k nhft,a section - B ([kam&c) 28. The important function of Cell Membrane is (a) to control the entry and exit of some materials across the cell. (b) to control the entry and exit of all materials across the cell. (c) to control only entry of some materials across the cell. (d) to control only exit of some materials across the cell. dksf'kdk f>yyh dk izeq[k izdk;z gs %& (a) dqn inkfkks± dk dksf'kdk ds vkj&ikj izos'k rfkk fudkl fu;fu=kr djuka (b) lhkh inkfkks± dk dksf'kdk ds vkj ikj izos'k rfkk fudkl fu;fu=kr djuka (c) dqn inkfkks± dk dksf'kdk ds vkj ikj dsoy izos'k fu;af=kr djuka (d) dqn inkfkks± dk dksf'kdk ds vkj ikj dsoy fudkl fu;fu=kr djuka 29. How many Biosphere Reserves in India have been established by Indian Government? (a) 0 (b) 5 (c) 5 (d) 20 Hkkjr ljdkj }kjk Hkkjr esa fdrus tsoeamy vkjf{kr {ks=k LFkkfir fd, x, gsa\ (a) 0 (b) 5 (c) 5 (d) Why cells could not be discovered before 7th Century? l=kgoha 'krkcnh ls igys dksf'kdkvksa dh [kkst D;ksa unh gks ldrh Fkh\ 3. How antibiotics inhibit the growth of pathogens?,savhck;ksfvd fdl izdkj jksxtudksa dh o`f¼ dks jksdrs gsa\ 32. Why is it important to select same species of plants for reforestation? iksèkksa dh dqn Lih'kht dk p;u iqu% oujksi.k ds fy, D;ksa vko';d gs\ [70]

13 33. (a) How vaccines provide immunity against diseases? (b) Name one disease against which vaccine is available. (a) fdl izdkj osdlhu (Vhdk) jksxksa ds fo#¼ izfrj{kk miyc/ djkrk gs\ (b) fdlh,d jksx dk uke fyf[k, ftlds fo#¼ Vhdk miycèk gsa OR (vfkok) (a) Why are viruses considered as unique? (b) Write one characteristic feature of viruses which enable them to place in the category of living organisms. (a) okbjlksa dks vf}rh; D;ksa le>k tkrk gs\ (b) okbjlksa dk,d fof'k"v y{k.k fyf[k, tks mugsa lthoksa ds oxz esa j[kus esa lgk;d gsa 34. Reena wanted to help her mother in doing household chores. One day her mother was making mango pickle. She helped her mother in mixing the ingredients. After bottling the pickle, her mother poured mustard oil on top of the pickle before closing the lid. (a) Why did Reena's mother pour mustard oil over pickle after bottling. (b) Write one value each displayed by Reena and her mother. jhuk?kj ds dk;ks± esa viuh ekrk th dh lgk;rk djuk pkgrh FkhA,d fnu mldh ekrkth vke dk vpkj rs;kj dj jgh FkhaA mlus viuh ekrkth dh lhkh la?kvdksa dks fefjr djus esa lgk;rk dha vpkj dks cksry esa Hkjus ds i'pkr~ mldh ekrkth us <Ddu can djus ls igys vpkj ds Åij ljlksa dk rsy MkykA (a) jhuk dh ekrkth us vpkj dks cksry esa Hkjus ds i'pkr~ ljlksa dk rsy D;ksa Mkyk\ (b) jhuk rfkk mldh ekrkth }kjk iznf'kzr,d&,d ewy; fyf[k,a 35. A new species 'X' is introduced in a forest. How is it likely to affect the local species of that area?,d ou esa,d u;h Lih'kht 'X' dk izos'k djk;k x;k gsa ;g ml {ks=k dh LFkkuh; Lih'kht dks lahkor% fdl izdkj izhkkfor dj ldrh gs\ 36. (a) Why cell organelles are named so? (b) Which cell organelle is called power house of the cell and why? + +½+½ 2 +2 [7]

14 (a) dksf'kdk vaxdksa dks bl izdkj uke D;ksa fn;k tkrk gs\ (b) fdl dksf'kdk vaxd dks dksf'kdk dk fctyh èkj dgk tkrk gs rfkk D;ksa\ 37. (a) Why do animal cells show a large variation in shape? (b) Given below is the diagram of a plant cell. Write the name of its parts (a), (b), (c) and (d). (a) turq dksf'kdk,a vkdkj esa vf/d fofhkuurk D;ksa iznf'kzr djrh gsa (b) blds Hkkxksa (a), (b), (c) rfkk (d) ds uke fyf[k,a Alternative question for visually challenged students in lieu of Q. No. 37. ç-la- 37 ds LFkku ij n`f"v jfgr fo kffkz;ksa ds fy, osdfyid iz'ua (a) Why do animal cells show a large variation in shape? (b) Write any two differences between plant and animal cell. (a) D;ksa i'kq dksf'kdkvksa ds vkdkj esa cm+s cnyko fn[kk djrs gsaa (b) ikni dksf'kdk rfkk turq dksf'kdk ds eè; fdugha nks fcanqvksa esa fohksnu dhft,a 38. (a) What are communicable diseases? (b) Give any two examples of bacterial diseases which spread through consumption of contaminated water. (c) Write any two preventive measures against water borne diseases. (a) laøked jksx D;k gksrs gsa\ (b) nwf"kr ty ds mihkksx ls isqyus okys fdugha nks csdvhfj;y jksxksa ds mnkgj.k nhft,a (c) ty ls mriuu gksus okys jksxksa ds fo#¼ dksbz nks fuokj.k fofèk;ka fyf[k,a (a) (c) (b) (d) [72]

15 OR (vfkok) Give reasons for the following - (a) Mosquitoes can be controlled by preventing stagnation of water though they don't live in water. (b) Farmers prefer to grow beans and peas in nitrogen deficient soils. (c) Raw vegetables and fruits are kept in refrigerators whereas jams and pickles can be kept outside. fueu ds fy, dkj.k nhft, %& (a) #ds gq, ty ds fuokj.k ds epnjksa dks fu;af=kr fd;k tk ldrk gs tcfd os ty esa ugha jgrs gsaa (b) ukbvªkstu dh deh okyh e`nk esa Ñ"kd lse rfkk evj mxkus dks ojh;rk nsrs gsaa (c) dpph lfct;ksa rfkk iqyksa dks jsçqhtjsvj esa j[kk tkrk gs tcfd tse rfkk vpkjksa dks ckgj j[kk tk ldrk gsa 39. (a) What is deforestation? (b) Name two projects that have led to large scale deforestation. (c) How does deforestation result in flooding? (a) ouksuewyu D;k gksrk gs\ (b) fdugha nks ifj;kstukvksa ds uke fyf[k, ftuds dkj.k vf/d isekus ij ouksuewyu gqvk gsa (c) ouksuewyu dk ifj.kke fdl izdkj ck<+ gksrk gs\ OR (vfkok) (a) How does deforestation leads to desertification? (b) Why is it important to protect forests? Give any three points. (a) ouksuewyu dk ifj.kke fdl izdkj e#lfkyhdj.k gksrk gs\ (b) ouksa dh j{kk djuk D;ksa vko';d gsa dksbz rhu fcanq fyf[k,a [73]