1 Which animal tissue is commonly known as packaging tissue? 1 2. Calculate the formula unit mass of CaCO3 (given at masses: Ca = 40. 0µ, c=12 0µ, 0 = 16.0µ . determines ‘pitch’ of sound. 1

5. How does the speed of sound change on increasing the temperature? 1 6.What do you mean by photoperiod? Name two processes that are dependent on photoperiod. 2 7. What will happen if:

i) The skin epithelium is not stratified.
ii) Stratified squamous epithelium lines blood vessels. 2 8. Name the target organ/organ system of AIDS virus. What is the cause of death in case of people suffering from AIDS? 2 9. What is meant by (i) a solute and (ii) a solvent in a solution? Identify the solute and the solvent in a homogenous mixture of iodine and alcohol. 2 10. A housewife churned full cream milk with a milk churner. (i) What did she observe after churning milk?

(ii) What could be the possible reason for this observation? 2

11. The average atomic mass of a sample of an element ‘X’ is 16.2µ. What is the percentage of each isotope 16X and 18X in the sample? 2 12.Why does a wooden block float and an iron block sinks when both are placed on the surface of water ? 2

13. The gravitational force of attraction between two masses is 16 N. What would be the force of attraction between them if each mass and the distance between them are doubled? 2 14. A child winds his toy car by moving its key. Name the type of energy – i) used up in the process

ii) energy transformation taking place in it
The car then runs on the floor of the room. Give the transformation of energy taking place in it now. 2

15. To increase productivity per unit area ,the farmers grow two different types of crops on the same field in definite rows. What is this practice called? What care is required to be taken before selecting two crops for such practice and why? Give any two reasons 3.
16. Draw a neat diagram of the leaf epidermis showing pores through which exchange of gases takes place. Label any two parts giving one function of each. 3 17. i) Which of the following diseases are protozoan in origin? a)Dengue b)Malaria c)Kalaazar d)AIDS ii) Suggest any two ways you would like to adopt, to prevent being infected by them. 3 18. Write two properties each of a solution, suspension and a colloid with respect to stability and filterability. 3

19. (i) State ‘Law of constant proportions’.

(ii) Taking the example of water, explain the law of constant proportions. (iii) Which postulate of Daltons’ atomic theory explains this law? 3

20. (i) Write the names of the compounds represented by the following formulae: a)...

+1 +2 -5.4 -6.5 -62 .. /2 /a 0 000 000j 0oc 0µ 1 1/2 10 100 100m 1023 10m/s2 11 12 12.044 12.why 13 14 15 16 16.0 16.2 16n 16x 17 18 18x 19 1s 1x3 2 20 200 200s 21 22 23 24 24.0 25 250w 26 27 273 28 29 2h 2m1 2m2 2s 3 30 31 32 33 34 35 36 37 38 39 4 4.9 40 40µ 41 48 48g 49 5 50 6 6.what 7 72 8 9 9.8 90 98 ab absenc absent acceler act ad adopt adulter aid alcl alcohol along altern alum aluminum alway ammonium amount anal anim antenna appear area areolar around associ atmospher atom attract audibl averag b balanc barium basi bc be belong block blood blue bodi book bottom bound boy bright brood brought brown buoyanc butter c ca caco3 calcul call cannot car care carri case caus cd cell cellular cerci chang charact charg cheap chemic child chlorid chlorophyl chromosom churn churner climb close cockroach colloid colour combin common complet compon compound configur constant contain cool copper correct could cream crop curv cuso4 cylind d dal dalton de death decompos defect defin definit dengu denser densiti depend deposit detect determin diagram differ direct diseas displac dissolv distanc done doubl drain draw drop droplet due durat e earth easili edg electr electron element end energi entir epidermi epidermis-protect epithelium equal eucaryot evolv exampl exchang experi experiment explain explan exposur f1 f2 fall farmer fast fastest field fig figur file fill filter find float floor flower follow food forc fork form formalin formula free freeli frequenc fresh full fume function funnel g gain garbag gas gase germin give given glycerin gm1 gm1m2 gravit graviti green grey grow growth gt guard h h2o happen hcl heard heat heavi heavier height henc homogen hot housewif human hydrogen hz identifi ii iii immedi immers immun increas infect infrasound inner insid insolubl inter intercrop invert iodin ion iron isotop iv j k kalaazar key kg khz kinet kno known label laboratori lack larger law layer leaf least less lesser level lie lighter lignifi like line liquid locat long lose loss lymph m m/s m/s2 m1m2 m2 made magnesium malaria male mark mass maximum may mean meant measur membran metal metanil mg mgh mgo microscop milk minor minut miss mix mixtur mount move muscular n na name ncert neat need negat net neutral neutron nitrat nobl nodes/immune nostoc note nt nuclear nucleoid nucleus number nutrient o observ obtain occur octet one open opposit organ/organ organell origin outermost oxid oxygen p p.e packag page paper part part/parts partial particl pe peopl per percentag perform permeabl perpendicular pest photoperiod physic piec pink pitch place plant plasma plot pond poor pore posit possibl posterior postul potassium potenti pouch power practic prefer presenc present prevent problem procaryot procedur process product prokaryot propag properti proport protect proton protozoan puls q quantiti r rama rang rapid rate ratio reactiv reason red reddish reflect region relat remain remov repres requir respect ribosom rohit roof room row run salt salti sampl sargarsum satellit scheme scienc sclerenchyma second select serious set settl shell short show shown silki similar singl sink skin slinki slinky/string small sodium solid solut solvent sound sourc space specimen speed sphagnum spirogyra spread spring spun squamous stabil stabl stagnant starch state statement stay step stomata stone store stratifi street strong student style sublim substanc suffer suffici sugar suggest sulphat sulphid sulphur sunlight surfac surround suspens system take taken tap target team tear temperatur temporari test theori therefor thick three throw thus time tissu top touch toy transform transluc tube tug tune turn two type typic ultrasound unit unstabl up upper use util v valenc vapour veloc verifi vertic vessel vibrat virus w wall war wast water wax way wear weigh weight well whatev white whole win wind wine without wooden work would write wrong x yellow zero µ