Cbse Sample Paper for Class 7 Science Sa2

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    SECTION A 1.   1MARK Loamy 2.   1MARK 40km/h. 3.   1MARK weathering of rocks 4.   2MARKS a; cockroach-tracheal tubes and spiracles b; frog-lungs and skin c; plants= stomata d; earthworm-moist skin 5.   2MARKS Refer fig no11.3 on page123 of textbook 6.   2MARKS WBC  –  They help us fight against diseases Platelets_ They help in clotting the blood 7. 2MARKS S.NO   ASEXUAL REPRODUCTION   SEXUAL REPRUDUCTION   1   seeds not formed   seeds formed   2   vegetative parts are involved reproductive parts are involved   8.   2MARKS Refer fig no12.5 on page 135 9.   2MARKSfig 14.8 on page163 of text book 10.   2MARKS Name the kind of mirror used 1: head lights of car- concave mirror 2: by Dentists-concave mirror 11.   3MARKS Complete this table with words MAXIMUM, LEAST, MEDIUM  Sl  No   Characteristics   sandy soil   loamy soil   clayey soil   1   Particle size   maximum   medium   least   2   Absorption of water    least   medium   maximum   12.   3MARKS . The time period of pendulum? 32/20=1.6 s  b: Refer fig no13.4 on page 146 KENDRIYA VIDYALAYA SANGATHAN HYDERABAD REGION SCORING KEY FOR COMMON SUMMATIVE ASSESSMENT  –   II Class: VII Subject :SCIENCE www.ncerthelp.com Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More...   13. 3MARKS 1.reuse water used to wash vegetables in kitchen garden 2.water used for rinsing clothes can be used in toilets 3.use bucket of water instead of shower to bath or any other method 14.   3MARKS Some of the forest products are wood, gum, sealing wax, medicines, paper ,oils etc. 15.   3 MARKS: 1: bar screens 2. grit and sand 3. Decreased. 4. Sludge. 5. Clarified. 6. aerobic . 16.   a) 3MARKS Write any three differences between aerobic and anaerobic respiration. S.NO   Aerobic respiration   Anaerobic respiration   1   Occurs in presence of oxygen   Occurs in absence of oxygen   2   Complete breakdown of glucose into CO 2 and H 2 O occurs   Glucose is partially broken down into alcohol and CO 2   3   More energy released   Less energy released    b) 2MARKS when oxygen availability is less anaerobic respiration occurs in muscle cells and lactic acid is produced which results in muscle cramps. We can get relief by a massage or by a hot water bath or a) 2marks the number of times a person breathes in a minute is termed as  breathing rate .it increases duping a exercise  b)2marks sleeping reading jumping, running c)1mark(anyone) S.NO   Exhaled air    Inhaled air    1   The air given out during breathing   The air taken in during breathing   2   It is rich in CO 2   It is rich in O 2   17.   a) 2marks The wire gets hot when electric current passes through it. This is called heating effect of electric current www.ncerthelp.com Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More...   b) 1mark electric heater, electric room heater, geyser or any other c)2marks A fuse is an electric device which pre vents damage to electrical circuits and  possible fires. They have a fuse wire which melts and breaks when excess current flows through the circuit thus breaking the circuit and help in saving electric appliances and possible fires or a)2marks When electric current passes through a wire, it behaves like a magnet. This is called magnetic effect of electric current'  b)1mark Hans Christian Oersted discovered magnetic effect of electric current c)2marks Coils which behave as a magnet when current passes through them are called electro magnets .two uses of electromagnets are in electric bells, lifting heavy loads, separating magnetic material from junk or any other use. 18. a) 1mark The change in direction of light when it falls on a mirror or other surfaces is called reflection of light  b) 2marks what are four characteristics of image formed by plane mirror? The image formed by a plane mirror is erect It is of the same size as object It shows lateral inversion It is at a same distance from the mirror as the object It is virtual (any four) c)2marks. 1 .Real images can be obtained on a screen whereas virtual images cannot be obtained on a screen or a)2marks: The two types of mirrors are concave mirror and convex mirror diagram on page 179 of text book  b) 1markconvex lens c)2marks draw what happens when sunlight falls on a prism diagram on page186 it splits into seven colours VIBGYOR www.ncerthelp.com Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More...   SECTION B MCQ (1M EACH) 19. b) plants, 20. b) The amount of air available to a person is less than available on ground 21. c) capillaries. 22. c) Bryophyllum 23. b) drumstick 24. a) km/h 25. c) 26. a) positive terminal 27. b) convex 28. c) heavy rainfall 29. a) 22 nd  March 30. d) kerosene 31. b) II and III www.ncerthelp.com Visit www.ncerthelp.com for Ncert Solutions in Text and Video , CBSE Sample papers, Exam tips, NCERT BOOKS, Motivational Videos, Notes for All Classes and Many More...
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