Science and Technology Homework Activities - CBC Grade 4

QUESTIONS

LIVING THINGS

1. State two characteristics of plants as living things
   1. .....................................................................
   2. .....................................................................
2. The following are protective clothing needed when handling plants. Name them 
   
3. A mango plant produces a young mango plant. This shows that plants ..................................................................... (die, reproduce)
4. We should wear ..................................................................... to protect our feet when handling plants.
5. Draw and colour the protective clothing that protects our eyes when handling plants
   
6. Classify the following into living and nonliving things.
   stone, dog, paper, earthworm, flag, frog, bottle, plant, cow, jembe
   

   	Living things	Non-living things
   a)
   b)
   c)
   d)

7. Another name for young plants is ..................................................................... (fruits, seedlings)
   
8. The picture above shows that plants ..................................................................... (grow, die)
9. Name any three plants found in your locality (area)
   1. .....................................................................
   2. .....................................................................
   3. .....................................................................
10. Plants need ..................................................................... to grow healthy (darkness, sunlight)

ANIMALS

1. Name two characteristics of animals
   1. .....................................................................
   2. .....................................................................
2. Animals without a backbone are called .....................................................................
3. Animals with a backbone are called .....................................................................
4. We should use ..................................................................... to carry small dangerous and poisonous animals (plates, forceps)
5. State whether the following animals are vertebrates or invertebrates
   
6. Name two protective clothing that you need when handling animals
   1. .....................................................................
   2. .....................................................................
7. Which of these animals does not have a backbone? .....................................................................(chameleon, fish, earthworm)
8. Animals move from one place to another...................................................................... True or false
9. A chicken reproduces by ..................................................................... (giving, birth, laying eggs)
10. Write the characteristic of animals shown below .....................................................................
    

HUMAN BODY

1. Digestion of food starts in the ..................................................................... and ends in the .....................................................................
2. The picture below shows the digestive system. Name the parts marked
   
   
   1. .....................................................................
   2. .....................................................................
   3. .....................................................................
   4. .....................................................................
   5. .....................................................................
   6. .....................................................................
3. Another name for small intestine is .....................................................................
4. The juice found in the mouth is called .....................................................................
5. How many incisors does a human being have? .....................................................................
6. The type of teeth used for biting and cutting food are called .....................................................................
7. How many roots does a premolar tooth have? .....................................................................
8. Draw and colour a molar tooth
   
9. State two characteristics of canines
   1. .....................................................................
   2. .....................................................................
10. The two types of teeth that are used for chewing and grinding food are ..................................................................... and .....................................................................

ENVIRONMENT
Air Pollution

1. What is the meaning of air pollution? .....................................................................
2. Write two causes of air pollution
   1. .....................................................................
   2. .....................................................................
3. Motor vehicle pollute air because they produce a lot of ..................................................................... (water, smoke)
4. What is the air pollutant in the picture below?
   
   Write True or False
5. Plants and animals need clean air for their growth .....................................................................
6. Polluted air is the best for breathing .....................................................................
7. Dusty roads cause air pollution .....................................................................
8. We can reduce bad smell from the toilets by .....................................................................
9. State one way in which animals are affected by air pollution .....................................................................

Task
Walk around your home and identify one air pollutants. Tell your parent/guardian about it.

Water Pollution

1. The harmful substances that cause water pollution are called water ..................................................................... (cleaners, pollutants)
2. The picture below shows a .....................................................................
   
3. Drinking water should be ..................................................................... to kill germs.
4. Name one disease that one can get by drinking polluted water .....................................................................
5. Write two causes of water pollution
   1. .....................................................................
   2. .....................................................................
      Write True or False
6. Clean water is black in colour .....................................................................
7. Clean water has no smell ....................................................................
8. Oil spillage does not pollute water .....................................................................
9. Write one way of reducing water pollution .....................................................................

DIGITAL TECHNOLOGY

1. Write the name of each of the digital devices shown below.
   
2. Write the functions of the following parts of a computer
   1. Monitor.....................................................................
   2. Keyboard .....................................................................
   3. Central processing unit .....................................................................
3. What is coding? ..........................................................................................................................................
4. Work out the Sudoku puzzle below by filling in the blank squares with correct numbers
   
5. State two safety precautions to observe when using digital devices
   1. .....................................................................
   2. .....................................................................
6. Draw and colour a football with its coded pattern
7. The part of a computer that controls a pointer on the screen is the ..................................................................... (speaker, mouse, cable)

MATTER
States of Matter

1. Name the three states of matter
   1. .....................................................................
   2. .....................................................................
   3. .....................................................................
2. Classify the materials below as liquids, gases or solids.
   Stone, air, cooking oil, pens, milk, wood, steam, smoke
   

   SOLIDS	LIQUIDS	GASES

3. Write True or False
   1. Solids have a definite volume .....................................................................
   2. Gases have a definite shape .....................................................................
   3. Liquids occupy space .....................................................................
4. Which one of the following is a solid .....................................................................? (water, air, soil)
5. State two characteristics of gases
   1. .....................................................................
   2. .....................................................................

PROPERTIES OF MATTER

1. Look at the picture below
   
   From the picture, it is true to say that the stone is .....................................................................  in water (floating, sinking)
2. Write down any two examples of objects that float on water
   1. .....................................................................
   2. .....................................................................
3. Write down any two examples of objects that sink in water.
   1. .....................................................................
   2. .....................................................................
4. State two factors that affect floating, one sinking
   1. .....................................................................
   2. .....................................................................
5. A boat floats on water because of its .....................................................................(size, shape, weight)
6. A crushed bottle top .....................................................................(sinks, floats) in water while the one which is not crushed .....................................................................(sinks, floats)
7. Which one of the following is a sinker? ..................................................................... (a straw, a toothpick, a nail)
8. Study the materials given below
   Feather          Rubber                    Keys
   Coin                Pin                          Leaf
   Straw             Candle wax
   Group the above materials into floaters and sinkers and fill in the table below
   

   Sinkers	Floaters

9. The picture above shows a person swimming using a .....................................................................
   
   (floater, sinker)
10. Write True or False
    1. Floaters save lives .....................................................................
    2. A small pin floats on water .....................................................................

FORCE AND ENERGY
Force and its effects

1. What is force? .....................................................................
   State what is happening in each of the pictures below
   
2. Write three effects of force on objects 
   
   1. .....................................................................
   2. .....................................................................
   3. .....................................................................
3. Write two activities that require force
   
   1. .....................................................................
   2. .....................................................................
4. Write True or False
   1. Force can make an object move .....................................................................
   2. Force cannot change the shape of an object .....................................................................
   3. Force can change the direction of a moving object .....................................................................

Task
Apply force by kicking a ball and observe what happens. Share your experience with your friend.

SOUND ENERGY

1. Name two instruments that can produce sound
   1. .....................................................................
   2. .....................................................................
2. Sound travels in .....................................................................(one direction, all directions)
3. Sound can be reflected. True or false .....................................................................
4. When a bell is rung in the school compound, all the pupils hear the bell.
   This shows that sound travels .....................................................................
5. Reflected sound is also called .....................................................................
6. Name the places where sound can be reflected.
   1. .....................................................................
   2. .....................................................................
7. A flute produces sound by .....................................................................(blowing, hitting, plucking)

LIGHT ENERGY

1. Study the activity below
   
   The above activity shows that light travels in a .....................................................................
2. The materials that allow all the light to pass through are called .....................................................................materials (opaque, transparent, translucent)
3. List two materials that allow all the light to pass
   1. .....................................................................
   2. .....................................................................
4. Materials that allow only small amount of light to pass through are called ..................................................................... materials
5. Name two examples of translucent materials
   1. .....................................................................
   2. .....................................................................
6. .....................................................................materials do not allow any light to pass through them. (transparent, opaque, translucent)
7. A clear glass is an example of a .....................................................................material.
8. Give two examples of opaque material
   1. .....................................................................
   2. .....................................................................
9. Which of the following is a transparent material? .....................................................................(Stone, air, frosted glass)

HEAT ENERGY

1. The movement of heat through solids is called.....................................................................
2. Study the experiment below
   
   When the metal rod was heated for sometime, the pins started falling off.
   Which was the first pin to fall off? .....................................................................
3. Which was the last pin to fall off .....................................................................
4. The heat reached the pins by a method called .....................................................................
5. What is the difference between good and poor conductors of heat? .....................................................................
6. Name two good conductors of heat
   1. .....................................................................
   2. .....................................................................
7. Name two poor conductors of heat
   1. .....................................................................
   2. .....................................................................

MACHINES

1. The fixed part of a lever is called .....................................................................
2. Indicate the effort, load or fulcrum in the following levers.
   
3. Levers make work ..................................................................... (harder, easier)
4. The part of a lever where force is applied is called the ..................................................................... (load, effort, fulcrum)
5. Draw and colour a beam balance in the space provided
   
6. What we try to lift in a lever is called  ..................................................................... (fulcrum, effort, load)
7. Name any two materials needed when making a beam balance
   1. .....................................................................
   2. .....................................................................
8. Name one lever found in your home .....................................................................

EARTH AND SPACE

1. State two things seen in the sky at night
   1. .....................................................................
   2. .....................................................................
2. The moon gets its light from the .....................................................................(clouds, sun, rain)
3. Name two things that we see in the sky during the day.
   1. .....................................................................
   2. .....................................................................
4. Name the clouds shown below:-
   
5. Name two activities that are done during rainy weather
   1. .....................................................................
   2. .....................................................................
6. Write two characteristics of cumulus clouds
   1. .....................................................................
   2. .....................................................................
7. The sun rises in the ..................................................................... and sets in the .....................................................................
8. State two activities done during windy weather 
   1. .....................................................................
   2. .....................................................................

MARKING SCHEME

Living things
Plants 

1.                    
   1. They grow
   2. They reproduce
2.                          
   1. Gloves
   2. Apron / instant
   3. Gumboot
3. Reproduce
4. Gumboot
5. Drawing
6. Living things -  Dogs, Earthworm, Cow, Frog. Plant
   Non-living things - Stone, Paper, Flag, Bottle Jembe
7. Seedling
8. Die
9. Any sensible answer 
10. Sunlight

Animals

1.                
   1. they move
   2. they grow
2. Invertebrate
3. Vertebrate
4. Forceps
5.                                  
   1. vertebrate
   2. Invertebrate
   3. Vertebrate
   4. invertebrate
6. Gloves, gumboots
7. Earthworm
8. True
9. Laying eggs 
10. Reproduction

HUMAN BODY

1. Mouth, colon
2.                            
   1. food pipe
   2. Stomach
   3. Large intestine (colon)
   4. Rectum
   5. Mouth
   6. Small intestine
3. Ileum
4. Saliva
5. 8
6. Incisor
7. Two
8. Drawing
9.                    
   1. Sharp and pointed
   2. Have are not 
   3. Premolars, molars

ENVIRONMENT
Air Pollution

1. Making air dirty
2.                      
   1. Bad smell from dirty toilets
   2. Smoke from vehicles
3. Smoke
4. Smoke
5. True
6. False 
7. True 
8. Cleaning them
9. pollution can cause breathing problems

Water pollution

1. Pollutants
2. Water filter
3. Boiled
4. Cholera
5.                      
   1. Human wastes
   2. Soil particles
6. False
7. True
8. False
9. Proper disposal of human waste

Digital technology

1.                        
   1. Desktop computer
   2. Smart phens
   3. Radio
   4. Television 
2.                      
   1. Shows work being done by the computer
   2. Typing numbers/ symbols into a computer
   3. Controls all the different parts of a computer
3. Making something stand for another thing 
4. 3,4 4,3 5.
5.                  
   1. Do not make friends with unknown people online
   2. Avoid touching open socket when connecting digital devices
   3. Drawing 
   4. Mouse

MATTER
States of matter

1.                      
   1. Solids
   2. Liquids
   3. Gases
2. Solids: Stone, wood, pens
   Liquids choking oil Milk
   Gases; Air, Steam Smoke
3.                            
   1. True
   2. False
   3. True
4. Soil
5.                    
   1. They do not have a definite shape 
   2. Have no definite volume

PROPERTIES OF MATTER

1. Sinking 
2.                          
   1. Feather
   2. Plastic ruler
3.                                            
   1. Stone
   2. Glass
4.                            
   1. Shape
   2. Type of material
5. Shape
6. Sinks, floats 
7. A nail 
8. Sinkers; coin, key. pin
   Floater; Feather, Straw, candle wax, leaf
9. Floater
10.                      
    1. True
    2. False

FORCE AND ENERGY

1. A push or a pull
   1. A man pushing a wheelbarrow 
   2. Lifting a box
   3. Pushing a car
2.                  
   1. It makes an object more
   2. can stop a moving object
   3. Can change direction of a movingobject
3.                          
   1. Riding a bicycle
   2. Pushing a wheelbarrow
4.                        
   1. True 
   2. False
   3. True

SOUND ENERGY 

1.                
   1. Flute
   2. Guitar
2. All directions
3. True
4. In all directions
5. Echo
6.                      
   1. A big hall
   2. A church building
7. Blowing

LIGHT ENERGY

1. Straight line
2. Transparent
3.                          
   1. Air
   2. Clear glass
4. Translucent 
5.                        
   1. Frosted glass
   2. Skylight, tracing paper
6. Opaque
7. Transparent
8.                      
   1. Stone 
   2. Wood
9. Air

HEAT ENERGY

1. Conduction
2. A
3. D
4. Conduction
5. A good conductor allows heat to pass but a poor conductor does not
6.                          
   1. Sufuria
   2. Kettle
7.                
   1. Cloth
   2. Wood

MACHINES

1. Fulcrum /pint
2. 
3. Easier
4. Effort
5. Drawing
6. Load
7.                  
   1. Tins of the same size
   2. Pieces of timber/wood
8. Wheelbarrow
9.              
   1. Stars
   2. Moon

EARTH AND SPACE

1.                      
   1. Stars
   2. Moon
2. Sun
3.                  
   1. sun
   2. clouds
4.                    
   1. cumulus
   2. nimbus
   3. Stratus
5.                    
   1. Planting
   2. Weeding
6.                  
   1. Found very high in the sky
   2. Look like cotton wool
7. East, West
8.              
   1. Winnowing
   2. Flying kites