ITL Public School Marking Scheme Summative Assessment Examination ( ) Science (Set -B)

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1 ITL Public School Marking Scheme Summative Assessment Examination (04-5) Science (Set -B) Date: Class: VII Time:Hrs M. M: 90 General Instructions:. There are two sections in this paper. Section A contains Q -4 & section B contains Q5-6.. Marks are indicated against each question.. Read all questions carefully. 4.All questions are compulsory. How is the Carbon dioxide from air taken into the plants for photosynthesis? Through the pores on the surface of leaves called stomata When is world water day celebrated? Why is it celebrated? March, to make people aware and to educate people about conservation of water What is the normal body temperature in Celsius scale? 7 0 C ½ for value ½ for 0 C 4 Amoeba is a microscopic single celled animal that constantly changes its shape and forms finger like projections.what are these projections called?how do they help the amoeba? Pseudopodia, locomotion ½,taking food ½ 5 A hot saturated solution of sugar turns into a solid mass of sugar piece at the base when we keep it undisturbed for sometime.name the phenomenon taking place.write two uses of this phenomenon. Crystallisation, Purification of impure substances ½,separation of substances ½ 6 Give one word for the following :- ½ * 4 a. Standard Unit of time- second b. An ancient time measuring device.-sundial/ water clock/ sand clock c. Device that shows the speed of a car. - speedometer d. Time taken for one complete oscillation of a simple pendulum.-time period 7 Discuss the role of following parts during digestion- * a)intestinal Villi- increase the surface area for absorption of nutrients b)salivary Glands- realease saliva that makes food soft and sticky,digestion of starch c)liver- secretes bile that helps in digestion of fats in small intestine Name the following- ½ *6 a)a parasitic plant amarbel/ cuscuta /dodder b)part of the plant that are regarded as the food factories- leaf c) An edible fungus- yeast/ mushroom d)bacterium found in root nodules of leguminous plants- Rhizobium e)substance used for testing presence of starch in leaf.-i soln f)slimy green patches found in ponds and stagnant water. algae 9 With reference to the organism Lichens answer the following- X i-name the two partners found in them-alga,fungus ½ each ii-what is the nature of association found between them? symbiotic relationship/mutualism iii-how do the two partners benefit each other? Alga prepares food,fungus absorbs water /provides shelter Give reasons for the following :- a)we feel cramps in our muscles after heavy exercise- accumulation of lactic acid ½,due to anaerobic respn ½ b)the gills of fishes are richly supplied with blood capillaries- exchange of respiratory gases ½,capillaries are thin walled making it easier ½ ½ + ½

2 c)a potted plant dies if it is overwatered roots are not able to breathe as the pores in soil get filled with water Construction of dams is a multi purpose project.give three reasons in support of the statement Collection of rain water/improvement of water table by percolation/electricity generation/prevents flooding/irrigation facilities any mk each. Explain the various stages in the life cycle of silk moth with the help of a well labeled diagram Egg--- larva ----cocoon ---adult ½ for writing about each mk diagram An element X is used to make grills and windows.it is observed that brown flaky substance gets deposited over it after sometime due to a process Y. i- Name the element X and the process Y - iron, rusting ½ each ii- Write the the two conditions required for the process Y to occur. air/o,moisture ½ each iii- Write the word equation for the process Y Iron+ O +water iron oxide +iron hydroxide(rust) mk 4 Explain any three reasons responsible for the depletion of water table in India. Over exploitan of resources,cutting of forests, urbanization ½ for each pont ½ for writing one line about each 5 Write any three points of differences between clinical & laboratory thermometer. Any three points each 6 A car moves with a speed of 40km/hr for 0 minutes and then with the speed of 60km/hr for another 0 minutes. Calculate the following: a. Total distance travelled by the car b. Average speed of the car speed = dist / time ½ 0min = ½ hr ½ d= 40*/ = 0 km ½ d= 60* /= 0 km ½ total dist= d+d =50 km ½ avg speed = total dist/ total time =50/ 50km/hr ½ 7 Explain the formation of land breeze with the help of a well labeled diagram. Unequal heating and cooling of water ½ During night ½, warm air above sea rises ½, cool air moves from the land to sea ½ Diag 8 What would be the nature of distance time graph for: a. An object moving with uniform speed. straight line graphb. An object that is not moving. straight line parallel to time axis c. An object moving with varying speed. a curved line ( mk each, if diagrams for each are given then also mk each) 9 a)write one similarity and one dissimilarity between aerobic and anaerobic respiration. Both use glucose as raw mat./ both give energy O used / in absence of O or high energy vs low energy output b)with reference to the human respiratory system complete the following table- ½ * 6 Sl.no. Changes Inhalation Exhalation Movement of ribs Outward/upward Inward / downwards Movement of diaphragm Downward Upward/back to original position Size of lungs/chest Expand/enlarged Contract/ (+) 5(+)

cavity relax/reduces in size 0 i-observe the given diagram and identify the parts P,Q,R,S + P=gall bladder,q=stomach,r=pancreas,s=small intestine ½ each ii-write the suitable term for- ½ each.

3 cavity relax/reduces in size 0 i-observe the given diagram and identify the parts P,Q,R,S + P=gall bladder,q=stomach,r=pancreas,s=small intestine ½ each ii-write the suitable term for- ½ each. A complex carbohydrate found in plants- cellulose. Organ where water is absorbed in the alimentary canal-large intestine. Acid secreted by the stomach-hcl 4. Teeth meant for biting/cutting the food-incisors 5. Number of milk teeth in a child-0 6. Removal of undigested food from the body-egestion a)what is Sericin? Gum/protein on the cocoon b)what will happen if the cocoons are not boiled for obtaining silk?(two points) adult moth will come out, breakage of long continuous threads of silk c)write the names of any two varieties of silk found in India and the states from where they are obtained. Muga/eri/tassar and state of each ½ * 4 An element A on heating in air burns with a dazzling bright light to form a substance B.B is then mixed with water to obtain C.C is now tested with red litmus that turns blue. i-identify substances A and B- Mg, MgO ½ each ii- Write whether conversion of A to B is a physical or chemical change. Give reason. Chemical change,light produced new substance is formed ½ each iii-write the equation for the conversion of A to B Mg + O MgO.5 iv- What do you understand about the nature of substance C after the litmus test? As red turns blue it is basic 0.5 v- Write any other two examples of the same type of change. Rusting of iron, digestion of food, burning of paper (any two) ½ each A bus starts from rest at 8:00 a.m. The distance covered by the bus at various time intervals are as follows: Distance(in km) Time (a.m.) 8:00 8:0 9:00 9:0 0:00 5(++ ) 5 5 a. Draw a distance- time graph for the given data.- ½ mk for proper straight line graph b. Mention the scale for distance & time taken by you. ½ for time scale ½ for dist scale c. From the graph find out the distance covered by the bus at 9:45a.m - 05 km (from graph). d. Calculate the average speed of the bus in km/hr. av sp=total dist /total time

4 =0/ =60 km/hr ½ formula,60km/hr ½ e-comment upon the nature of motion exhibited by the bus. uniform motion ½ 4 a. Convert 40 0 C into Fahrenheit scale. C/5 = F / 9 ½ 40/5 = F /9 ½ Calculation ½ 04 F ans ½ b. Give reasons- mk each i. False ceilings provide warmth during winters.-air is trapped,it is a bad conductor ii. Cooking pans are provided with plastic handles.- plastic is a bad conductor of heat iii. Outer walls of houses are painted white in places with hot climate.-white color is a good reflector of heat 5(+) Section B 5 Whales and dolphins often come up to the surface of water from time to time.what could be the reason for this? They are mammals and respire through lungs 6 Take test-tubes. Fill /4 th of each with water.label them A,B,C.Keep a snail in A,a water plant inb,and in C keep both snail and plant.which test-tube will have the highest concentration of CO and why? A ½, CO given out by snail accumutales Look at the given picture and write the mode of nutrition of the given organism. Fungus- saprotrophic nutrition ( ½ mk for writing fungus ) 8 Seema always puts the used water after washing vegetables and the waste water from her R.O. into the flower beds in her garden. Identify any two values shown by her actions Concern for environment / conservation of water / nature lover any value 9 Hari s colony does not receive pure drinking water.suggest two ways by which he can purify the water from a nearby well. R.O/ filtration / boiling / chlorine tablets/distillation (any two) ½ + ½ 0 Mention the traditional practice of storing rain water in Rajasthan. - Bawri / step well Name the thermometer used for measuring the temperature of a particular day reported in weather report. Maxm-minm thermometer Two identical tin cans were taken. The outer surface of one was painted black and of the other white. Equal amount of water is poured in them and left under sun for one hour. Will you observe any difference in the temperature of the water after one hour? If yes, why? Black can is hotter ½ black surface are better absorbers of heat ½ Why should we not use a clinical thermometer for measuring the temperature of hot milk or tea?

5 The range is 5 to 4 C i.e. low ½, it may break due to expansion of mercury ½ 4 Anandi is a4 year old girl who works in a wool industry.give two reasons to suggest why she should not work in wool industry. Child labour / wool fibres may cause sorters disease / school is missed (any two) + 5 A simple pendulum takes 6 seconds to complete 0 oscillations.calculate the time period. T= Time taken /no.of oscillations ½ = 6/0 ½ =.8 sec ½ value ½ unit 6 The given diagram shows a green plant that performs photosynthesis normally but its leaves are modified to trap insects. Identify the plant. Why does this plant feed on insects when it is green? -Insectivorous plant/ pitcher plant grow in Nitrogen deficient soil,n is essential for making protein and fats that are not prepared by photosynthesis

INDIAN SCHOOL AL WADI AL KABIR Summative Assessment I, 2014 Class: VII SCIENCE M.M: 60 17/09/14 Time: 3 hrs

INDIAN SCHOOL AL WADI AL KABIR Summative Assessment I, 2014 Class: VII SCIENCE M.M: 60 17/09/14 Time: 3 hrs General Instructions: (i) The question paper comprises of three sections A, B and C. (ii) All