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VI. Answer the following:                                                                                   3M x 6= 18M

27. Define fertilisation. Differentiate between internal and external fertilisation.



28. Write short notes on the following:


i) Adam’s apple ii) Secondary sexual characters iii) Menopause


29. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.


30. i) Draw and label a simple circuit showing electroplating.


ii) List any two objects around you that are electroplated.


31. Draw sketches to show the relative positions of prominent stars in


i) Ursa Major ii) Orion.


32. Water is one of our most precious commodities and no life can survive without it. It has been predicted that water scarcity will become the subject of ‘Wars’ in the near future. Write any two ways in which water is getting polluted? Write any two measures to stop water pollution at your level?


VII. Write detailed answers of the following:                                           5M x 2 = 1OM


33. i) What is earthing?


ii) Explain how lighting conductors protect tall structures from damage due to lightning?


iii) Suggest any two measures to protect ourselves from lightning.


 i) List any four changes in the body that take place at puberty.



 ii) What is balanced diet? Why is it more necessary for adolescents?


 iii) Why are chips, colas and junk food not good for health?


34. i) Draw a labelled sketch of the human eye.


ii) ‘Vision’ is one of the wonderful gifts given to us by God. But most of the people never take care of

their eyes. Care for eyes should be taken. Suggest two methods for proper eye care?



i) List any two sources of noise pollution in your surroundings.


ii) Explain in what way noise pollution is harmful to human.


iii) Write any two measures to limit noise pollution.


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