i CCE-14-SA-U-CLASS- 7 -Science-Question Paper SECTION·A I Choose the right answer I. The water holding capacity is the highest in a) sandy soil b) clayey soil c) loamy soil (lxlS=lS) d). mixture of sand and loam 2. In cockroaches, air enters the body through a) lungs b) gills c) spiracles d) skin 3. Which of the following contains a) RBC b) WBe c] platelets haemoglobin? d) plasma 4. The excretory product in fishes is a) urea b) uric acid c) ammonia 5. The cell which results a) zygote b) egg d) urine after the fusion of male and female gametes c) ovule d) ovary 6. Pollination is the transfer of pollen grains from a) anther to ovary b) anther to egg c) anther 7. The basic unit of speed is a) km/min b] m Zrnin ____ d) stigma to ovary d) m/s c) km/h 8. The odometer in a vehicle measures the a) speed b) distance c) time 9. White light is made up of a) seven b) five to stigma is called d) direction colours c) three d) one 10. The total amount of water on the earth is kept constant by a) the use and reuse of water b) the techniques like rain water harvesting c) water table in a place d) the continuous cycling of water among its three forms II . Which one of the following is not a forest product? a) gum b) plywood c) sealing wax d) kerosene 12. Which of the following gases is used for water treatment? a) ozone b) oxygen c) nitrogen d) carbon dioxide 13. Microbes which convert the dead organisms to humus a) autotrophs b) saprotrophs c) decomposers 14. World water day is celebrated on a) 22 March b) 22 February are called d) hetrotrophs c) 22 January 15. Sludge in separate tanks is decomposed to get biogas by a) yeast b) aerobic bacteria c) anaerobic bacteria d) 22 April d) fungus 2 SECTION B II. Answer the following questions in 2 or 3 sentences. 1l1X2=22) "Ir. 1. List two factors that determine the various types of vegetation and crops that might grow in any region? 2. What are the respiratory organ s in the following? a) fish b) humans c) earthworm d) frog 3. a) What is a tissue? b) Name the tissue that transports water and minerals and food in plants? 4. Draw a neat labelled diagram of the female reproductive part in a flower 5. Write one use each a) convex lens b} concave mirror 6. David is observing his image in a plane mirror. The distance between the mirror and his image is 4m. If he moves 1m towards the mirror, then what is the distance between David and his image? Why? 7. Mention any two ways in which you can conserve water 8. Why are forests called green lungs? 9. Oils and fats should not be released into the drains. Explain why ] O. What is the function of bar screens in Waste Water Treatment Plant? 11. Show the shape of the distance-time graph for the motion in the following cases: i) A car moving with a constant speed ii) A car parked on a side road SECTION C III. Answer the following questions in 3 or 4 sentences (11 X 3 = 33) 1. What do you mean by water pollution? What are the major pollutants which pollute water? 2. What are stomata? Give two functions of Stomata? 3. Draw a neat labelled diagram of the human excretory system? 4. Define time period? A simple pendulum takes 32 s to complete 20 oscillations, What is the time period? 5. What do you mean by weathering? Explain which horizon of soil is most suitable to grow plants and why? 6. Write the differences between aerobic and Anaerobic respiration?(any three) 7. Explain how the seeds are dispersed? 8. Write the importance of forests? (any three) 9. What do you mean by food chain? Write an example? 10. Why does an athlete breathe faster than usual after finishing the race? 11. Explain any three functions of blood? 3 SECTION 0 IV .. swer the following in detail. (5 X 4 = 20) 1. Describe any two methods of asexual reproduction? Give examples? 2. What is a simple pendulum? Explain the construction with figure.? 3. Explain the various processes at the water treatment plant with the help of an activity? 4. What would happen if forests disappear? -. 5. Classify the following as linear motion, circular or oscillatory? (a] motion of a child on a sea-saw (b) motion of a wheel of a sewing machine (c] Motion of vehicles on a straight road (d) motion of a pendulum of a clock • 4