Science - KCPE 2021 Prediction Set 3 (Questions and Answers)

1. Which one of the following statements is correct about fertilization in human beings?
   A. Occurs when embryo is formed.
   B. Occurs when sperms are deposited in the vagina.
   C. Occurs when cell division starts.
   D. Takes place in the oviduct.
2. Drugs can be misused in all the following ways except
   A. taking a wrong dosage.
   B. sharing drugs with a friend.
   C. taking less drugs than recommended.
   D. buying medicine with doctor's prescription.
3. Flea in livestock affects all the following except
   A. pigs.
   B. poultry
   C. rabbit.                           
   D. sheep.
4. The shape of a bird's beak can be used to tell
   A. the size of eggs the bird lays.
   B. the type of movement the bird has.
   C. what the bird feeds on.
   D. the number of eggs the bird lays.
5. Mulches are mainly used in the farm to
   A. prevent splash erosion.
   B. prevent the growth of weeds.
   C. conserve soil moisture.
   D. provide organic matter after decomposition.
6. The main function of a swim bladder in fish is to
   A. enable the fish to swim swiftly
   B. help the fish to float even when not swimming.
   C. help to reduce friction when the fish is swimming
   D. help the fish balance in water and propel forward.
7. Which one of the following signs of ill health in animals is not immediate?
   A. Blood in stool.
   B. Rough coat.
   C. Loss of weight
   D. Coughing.
8. A patient visited a doctor and had a painless Bore on the penis and swollen lymph glands. Which STI was the patient most likely to be suffering from?
   A. Syphilis.
   B. Chancroid.
   C. Gonorrhoea.                  
   D. AIDS.
9. The animal below is adapted to movement in all the following except
   
   A. has strong hind limbs to leap in water.
   B. has streamlined body to swim in water.
   C. has the body covered with a moist skin to swim easily.
   D. has strong hind limbs to hop on land.
10. Aerosol sprays destroy the ozone layer which leads to
    A. reduction of the rays from the sun.
    B. increase in oxygen in the air.
    C. thinning of the ozone layer.
    D. greenhouse effect.
11. Weight can be described as
    A. the matter content in an object.
    B. the volume of matter in an object.
    C. the force of resistant in air when an object is lifted
    D. the amount of force of gravity acting on an object.
12. The following are all excretory organs except one. Which one is it?
    A. Kidneys.
    B. Lungs.
    C. Nose.                            
    D. Skin.
13. To reflect heat and light away by a xerophytic plant, it is adapted by having
    A. thick waxy cuticle.
    B. silvery hairs on leaves.
    C. normal hairs on the leaf surface.
    D. deep wide spread roots.
14. 6 pupils carried out an activity below.
    (i) Put water in a container
    (ii) Added soap powder and made foam
    (iii) Using a straw or clean tube, they blew air into the water to make bubbles
    Which one of the following were they likely trying to demonstrate?
    A. Reflection of lights
    B. Refraction of light.
    C. Making a rainbow
    D. Making a liquid thermometer.
15. Which group of pastures below will provide animals with proteins when fed?
    A. Lucern, napier grass, desmodium
    B. Gylcine, clovers, desmodium
    C. Beans, peas, groundnuts.
    D. Oats, molasses, sweet potato vines.
16. The following are ways of conserving water except one, Which one?
    Shading.
    B. Storing in dams.
    C. Harvesting
    D. Using for irrigation
17. The following are symptoms of a certain communicable disease:
    (i) Sweating at night
    (ii) Loss of weight flui
    (iii) Chest pains.
    (iv) Prolonged cough
    The disease is likely to be
    A. Malaria.
    B. Typhoid.
    C. Tuberculosis.                
    D. Whooping cough.
18. Class five pupils carried out the experiment below.
    
    The pupils found out that soil L has the following characteristics except
    A. has the best drainage.
    B. has the lowest capillarity.
    C. becomes water logged easily.
    D. has largest air spaces and is coarse.
19. Irene, a kitchen worker, observed a stain on the walls of the kettle that was used to heat water. It could be caused by
    A. steel wool and soap.
    B. soft water.
    C. tea.
    D. hard water.
20. 5 pupils of Kipkelion primary school set up the experiment shown below.
    
    The experiment did not work well. Which of the following is the mistake they made when setting up the experiment?
    A. Using funnels of different sizes.
    B. Adding equal amount of water.
    C. Using collecting jars of different sizes.
    D. Having equal amount of cotton wool.
21. Which one of the following is not a sign of unhealthy crop?
    A. Curled leaves.
    B. Robust growth.
    C. Wilting.
    D. Malformation and distortion.
22. The following are ways in which the environment is polluted:
    (i) Use of excess fertilizers
    (ii) Dumping of industrial wastes
    (ii) Smoking cigarettes
    (iv) Aerosol sprays
    (v) Burning tyres
    (vi) Industrial waste gases
    (vii) Vehicle exhaust fumes
    Which group of the above activities pollutes air only?
    A. i, ii, vii, iv
    B. ii, iv, v, vi
    C. iii, vii, iv, v                    
    D. v. iv, i, ii
23. A bicycle in motion comes to a stop when brakes are applied due to
    A. heat produced between the brakes and the tyres.
    B. friction between the brakes and the road.
    C. the treads of the tyres.
    D. friction between the brakes and the rim.
24. The best method for softening temporary hard water is by
    A. filtering
    B. adding chemicals
    C. boiling.
    D. using soap while washing.
25. The next step to follow when separating a mixture of salt and pieces of copper after dissolving is
    A. passing a magnet.
    B. filtering.
    C. evaporating.                  
    D. adding water.
26. The part of food that has no nutritive value, not digested and is got from fruits and vegetable helps to
    A. prevent dehydration.
    B. absorb food in the intestine.
    C. prevent constipation.
    D. produce juice that completes digestion.
27. During breathing, air is cleaned, warmed and moistened in the
    A. nose.
    B. lungs.
    C. air sacs.                         
    D. trachea.
28. The following are plant nutrients. Which one is a macro-nutrient?
    A. Molybdenum.
    B. Boron.
    C. Iron.                              
    D. Phosphorus.
29. The jaws of herbivores have a toothless called diastema that helps in
    A. tearing food.
    B. proper turning of food while chewing.
    C. holding and gripping food.
    D. chewing hard grains.
30. A child with wrinkled face, visible bones and cries a lot is also likely to
    A. have swollen limbs and face.
    B. have sores at the comers of the mouth.
    C. have thin brownish skin.
    D. have potbellied stomach.
31. The diagram below represents a set up that was used to demonstrate a certain process.
    
    The process investigated was
    A. evaporation.
    B. freezing.
    C. convection.                  
    D. condensation.
32. Animals are given commercial feeds for all the following reasons except
    A. some are given as the only food.
    B. they are given mainly to increase production
    C. some are given together with other feeds.
    D. they are mainly for protection against diseases.
33. Which pair of drugs below consists of only prohibited drugs in Kenya?
    A. Bhang and khat.
    B. Tobacco and Alcohol.
    C. Cocaine and cobbler's glue.
    D. Mandrax and miraa.
34. During the process of making food in plants
    A. chemical energy is converted to light energy
    B. solar energy is converted to chemical energy.
    C. light energy is converted to green energy.
    D. photosynthesis energy is converted to green energy.
35. Mulching is done to crops for all the following reasons except to
    A. conserve soil moisture.
    B. form organic manure after decomposition.
    C. control the growth of weeds.
    D. control pests in crops.
36. The diagram below was set up by std. 6 pupils.
    
    The aspect of light being investigated was
    A. formation of shadows
    B. reflection of light.
    C. how light travels in a straight line.
    D. how light travels at angles.
37. The blood vessel that receives blood from all parts of the body to the heart has the following characteristics except
    A. have a wide lumen.
    B. have valves.
    C. blood flows under pulse.
    D. have thin inelastic walls.
38. Which one of the following materials will be attracted by a magnet?
     Office pins and copper coin.
    B. Staples and hacksaw blade.
    C. Steel wool and aluminium plate.
    D. Silver coin and iron nail.
39. A papyrus plant has all the following characteristic except
    A. it has shallow root system.
    B. it has wide broad leaves.
    C. it has thick waxy cuticles on leaves.
    D. it has air sacs on the leaves.
40. Which pair of animals below can be grouped together in a food chain?
    A. Lions and zebras.
    B. Snakes and mice.
    C. Antelopes and mice.
    D. Hyenas and gazelles.
41. The following are common features between a frog and a lizard exception
    A. both have external fertilization
    B. both lay eggs.
    C. both breathe by means of lungs.
    D. both have varying body temperature.
42. The statements below are all correct about simple machines except one. Which one is it?
    A. Simple machines make work easier by increasing effort or force applied.
    B. They make work easier by increasing the speed of working
    C. They make work easier by changing the direction of force.
    D. They make work easier by reducing the amount of work done.
43. The diagram below represents a set-up used to investigate conditions necessary for germination.
    
    In which of the above set-ups did the seeds germinate?
    A. W, Y and Z
    B. W and Z
    C. X and Y                        
    D. Z and X
44. The following will cause water pollute except Which one is it?
    A. Acid rain.
    B. Smoke from industries.
    C. Oil spills.
    D. Uncontrolled use of farm chemicals.
45. The following are disadvantages of fertilizers except Which one is it?
    A. Are bulky to transport.
    B. Pollute environment if used in excess.
    C. Are expensive to buy.
    D. Can only be used for one growing season.
46. The largest planet in the solar system is
    A. Saturn.
    B. Earth
    C. Jupiter                           
    D. Neptune.
47. Which part of the air is used by leguminous plants to make nitrates that plants use to make proteins?
    A. Oxygen.
    B. Carbon dioxide.
    C. Nitrogen.                       
    D. Rare gases.
48. A newly formed cell after fertilization is known as
    A. an embryo.
    B. a foetus.
    C. an infant.                      
    D. a zygote.
49. Clouds are classified according to all the following except using their
    A. height.
    B. appearance.
    C. shape.                           
    D. weight
50. All the following materials are needed when making a simple electric circuit. Which one is not needed?
    A. Dry cells.
    B. Connecting wires.
    C. Bulb.
    D. Sockets.

ANSWERS