21. John poured paraffin onto the bottle as shown in A below. He added water to the bottle as shown in B. Use the diagram to answer questions 21 and 22.

22. Give a reason for your answer in question 21 above.

Use the diagram of a seesaw below to answer question 23.

23. Isaac who weighs 30kg and Susan who weighs $5km sit on the seesaw above, such that Isaac sits at point X and Susan at point Y. Which side of the seesaw will go down?

24. How does leprosy spread?

25. Apart from being states of matter, in which way are liquids similar to gases?

26. Give one way in which a child can acquire immunity against a disease without being given a vaccine.

27. Give one example of how many uses water to produce energy.

The diagram shows an animal commonly found in the school surroundings. Use it to answer questions 28 and 29.

28. To which group of animals does it belong?

29. How does the animal protect itself from its enemies?

30. What advice would you give a mother whose child is suffering from Kwashiorkor?

31. Which structure of an insect has the same function as gills in a fish?

32. John threw a blanket onto a burning fire and the fire was put out. How did the blanket help in putting out the fire?

33. Complete the rays through the lens in the diagram below.

34. Suggest one reason why blood goes to the lungs first before it circulates to all the parts of the body.

35. Why do electricity wires hanging on electric poles sometimes appear loose and at other times tight?

36. Which part of the eye functions like a film in a camera?

37. Which body organ is damaged when you drink s lot of alcohol?

38. Give any one reason why it is not advisable to buy and use medicine from local shops.

39. Peter's friend is suffering from survey. Suggest a reason why Peter's friend is suffering from that disease.

40. Give any one way a farmer can improve on the local breed of cattle.