· Web viewThe weak tin roof would be blown away. As high speed wind is always accompanied with...

SECTION A

1. Mention any two causes of deforestation. (1)Any two relevant points ½ + ½

2. Distinguish between unisexual and bisexual flowers. (1)Unisexual- Flowers having either male or female sex organ. ( ½ )Bisexual- Flowers having both the sex organs.( ½ )

3. State the two laws of reflection.(1+1) (2)

4. What is an electromagnet? (1) State any two ways by which we can increase the

strength of an electromagnet. (1)

5. (a) State one point of difference between concave and convex lens. (2)

(b) ) What is spectrum and how is it formed? ( ½ + ½ )

Spectrum is a band of seven colours. It is formed due to dispersion.

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6. (a) Why do we get muscle cramps when we do vigorous physical exercise? (1)

(b) Differentiate between aerobic and anaerobic respiration.( two points each ½ x 4 = 2 )

7. (a) Label the parts A and B. (3)A- Kidney ( ½ ) B-Urinary bladder ( ½ )(b) Explain the parts labelled as A and B.

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8. Write any three measures to conserve forests. (3)

Any three correct responses ( 1 each)

9. (a) How would you distinguish between uniform and non-uniform motion? (2)

(b) A bus travelled a distance of 480 km in 8 hrs. Calculate the speed of the bus.(1)

S= d / t (1/2 ) = 480 / 8 = 60km/hrs ( ½ )

10. Observe the process and answer the questions. (3)(a) Identify the process.-fertilisation ( ½ )

(b) Define the process. (1)

(c) State any three post fertilization changes. ( 1/2 + ½+ ½ )

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11. (a) State any four adaptive features of penguin (3) ½ each for four points ( ½ x 4 = 2)

(b) How is lion tailed macaque adapted to live on trees? (1 )

12. (a) What would you do to neutralise acidic and basic soil? (1+1 ) (3)

(b) What should be done to get relief from a bee sting and why? ( 1)

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13. (a)Write any two differences between weather and climate.( Each point ½ ) (3)

(b) What is migration?

Migration is the seasonal journey which animals and birds undergo from colder to warmer place in order to cope up with cold and shortage of food supply during winter months. (1)

14. (a) All alkalis are bases but not bases are alkalis. Justify the statement. (3)

Bases that are soluble in water are called alkalis, but not all bases are soluble in water.

( ½ + ½ )

(b) Complete the following table.

Common name

Chemical name Any one use

Baking soda A- Sodium bicarbonate( ½ )

B-baking cakes,breads,fire extinguishers,medicines ( ½ )

C-slaked lime( ½ )

Calcium Hydroxide

D-pesticides,whitewashing,neutralizing acidic soil etc ( ½ )

15. With the help of a diagram label the different terms used in reflection. ( ½ x 6 =3)

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16. (a) Explain mechanism of breathing. ( 1+1) (5)

(b) Label the parts A,B,C,D.( ½ x 4 =2)

(c ) What is breathing rate ?

17. (a) Explain spore formation in ferns.( ½ x 4 = 2) (5)

(b) Explain grafting and also mention its advantages.( ½ x 4 = 2)

(c ) State the conditions necessary for germination of seeds.

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- Moisture, air, temperature, soil ( any two ½ + ½ )

18. (a) What is displacement reaction? (1) (5)

(b) What change will you observe when carbon dioxide is passed through lime water? (1)Represent the reaction in a word equation.( ½ + ½ )

(c) Explain any two methods to prevent rusting.( 1+1)

19. (a) Why is tungsten used to make the filament of bulbs? (1) (5)

(b) Which effect of electric current is utilised in the working of an electric fuse?

- Heating effect of electric current (1)

Give an advantage of MCB.(1)

(c ) Explain the working of electric bell.(2)

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20. (a) Label the parts in the given figure. ( ½ x 4 = 2) (5)(b) State the function of blood platelets. (1)- Clotting of blood(c ) How does urine help in indicating diseases? ( ant two 1+1)

21. (a) Why does a balloon put on the mouth of a bottle placed in hot water inflate? (1+1) (5)What does the experiment prove?

(b) What would happen if high speed winds blow over a house having weak tin roof ? Give reasons for your answer. ( 1)

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The weak tin roof would be blown away. As high speed wind is always accompanied with low pressure, the pressure outside is low whereas the pressure below the roof is greater, resulting in blowing of tin roof.

(c ) What cause lightening during thunderstorm? (1+1)

SECTION B

22. (a) What is time period? (1+1)

(b) What are the factors on which the time period of a simple pendulum depends?

23. (a) What do you mean by magnetic effect of electric current?When electric current passes through a wire, the current carrying wire behaves like a magnet.(1)(b) What happens to the needle of the magnetic compass when the direction of electric current is changed by reversing the connections? (1)

24. State the characteristics of an image formed by a plane mirror.( ½ x 4=2)

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25. What colour change will you observe when the following substances are tested with red and blue litmus paper? (1/2 x 4 =2)

26. Explain why the tin can gets distorted in shape when cold water is poured? (2)

27. What happens when magnesium is burnt in the presence of oxygen? Represent the reaction in a word equation? (1+1)When magnesium is burnt in the presence of oxygen it forms magnesium oxide.

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Substances Red litmus Blue litmus

Vinegar No colour change/Red Red

Baking soda Blue No colour change/Blue

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