Lesson Four
The importance of sunlight to living organisms
Worksheet4

Complete:
1. The plant is the main source of _______ and _____ for man and animals.
2. In the plant, the photosynthesis process is carried out in _________ which contain __________.
3. __________ is a biological process that takes place in the green parts of the plant to make its own food.
4. The necessary factors of the photosynthesis process are _________, ___________ and __________.
5. ___________ and ____________ are substances produced from the photosynthesis process.
6. The plant cells absorb sunlight by ___________ which give the plant its __________ color.
7. __________ is considered as a source of energy for plants.
8. In the photosynthesis process, ______ gas is absorbed and ________ gas is produced.

Write the scientific term of the following:
1- __________ Living organisms that can make their own food by the photosynthesis process.
2- __________ Living organisms depending on producers directly or indirectly to get their food.
3- __________ Living organisms that get their food through decomposing organic wastes as dead bodies, plant remains and decayed food.

Choose the correct answer:
1- All the following are necessary for photosynthesis process except __________
a- carbon dioxide gas        b- starch  
c- sunlight                         d- water
2- Plants use __________ in the photosynthesis process.
a- oxygen gas                    b- nitrogen gas
c- carbon dioxide gas        c- water vapour
3- Bread mold fungus is a _________
     a- producer               b- decomposer  
     c- consumer               c- all of the previous answers
4- The rot that is formed on bread is a type of _____
  a- bacteria     b- fungi    c- plants    d- animals.
5- Chloroplasts are found in __________
   a- green plants            b- decomposers  
   c- consumers               c- all of the previous answers


Give reasons for each of the following:
1- The green plants are called food producer organisms.
__________________________________________________________________________________
2- Decomposers and consumers can’t make their own food.______________________________________________________________________________
3- Decomposers have a great economical and environmental importance. __________________________________________________________________________________

Lesson Five
Energy paths through living organism
Worksheet5

Complete:
1- _________ feed on organic remains.

2- Wheat plant is ________, because it depends on itself to make its own food.

3- Rabbit is a _________ consumer.

4- Food chains begin with __________, then _______, then __________.

5- Energy transmits in the form of ________ from a living organism to another.

6- Food web is a group of ________ connecting together.

7- The producer gets the solar energy from _______.

8- By the death of consumers, the energy transfers into __________ through __________.

9- __________ is known as the energy transference from living organisms to another.

10- __________ are the paths that show the energy transference in the form of food from living organism to another in the food web and food chain.

Choose the correct answer:

1- In the food chain that contains green plant, locust and snake. Locust is considered as a __________.
     a- producer                        b- decomposer  
     c- herbivorous consumer    c- carnivorous consumer.
2- Lion can be classified as _________
     a- producer                         b- decomposer  
     c- herbivorous consumer     c- carnivorous consumer
3- Food chains start with the __________
     a- consumer's                      b- green plants  
     c- decomposers                  d- animals
4- The last consumer in the food chain is the _______
     a- producer                         b- decomposer  
     c- herbivore                        c- carnivore
5- Producers store sunlight energy in the form of ________ energy.
a- solar    b- sound    c- chemical        d- light

Put (√) or (X) and correct the wrong ones:

1- Consumers help the environment get rid of the organic remains.                                                          (      )
2- All food chains and food webs start with a producer organism.                                                        (      )
3- The food chains connecting together to form energy paths.                 (      )
4- Decomposers transfer the energy to nature.
5- Green algae are producers. (         )


Write the scientific term of the following:

1- Organisms that depend on themselves to make their                                     own food.                                          ___________
2- Living organisms that depend on plants or animals in                    feeding.                                       __________
3- Living organisms depend on organic remains in feeding.                                                                           __________
4- Living organisms that transfer the solar energy into       chemical energy.                            __________
5- Living organisms that help the environment to get rid of the remains of dead animals or plants. __________

Give reasons for each of the following:
1- Decomposers are useful organisms for environment.
__________________________________________________________________________________

2-All the food chains begin with a producer organism.
__________________________________________________________________________________

3- Green algae are considered as producers.
__________________________________________________________________________________

Unit Two – Force and Energy
Lesson One
Force and its Effect
Worksheet6
           
Complete:
1- __________ force changes the state of a toy car from rest to motion.
2- The measuring unit of force is ________ related to the scientist _______________.
3- The motion of a body __________ by increasing the force affecting it.
4- A balloon moves upwards by the effect of ________ pushing force.
5- A _________ is needed to lift up heavy objects.

Choose the correct answer:
1- A bicycle moves by the effect of__________
   a- leg pushing force         c- break pushing force        
   b- hand pushing force      d- motor pushing force
2- Sailing boats move on the surface of the River Nile by the pushing force of _________
   a- water          b- wind      c- ropes      d- motor
3- The blender is operated by the effect of ________
   a- water pushing force     c- air pushing force        
   b- hand pushing force      d- motor pushing force
4- All the following applications depend on motor pushing force except _________
  a- blender                   b- washing machine
  c- electric fan            d- bicycle
5- _________ is one of the applications that depend on engine pushing force in motion.
   a-Metro                     b- Electric lift
   c- Bicycle                   d- Electric sewing machine
6- _________ is one of the applications that depend on force in rising heavy objects.
   a- Crane                     b- Blender
   c- Wheelbarrow         d- Electric fan
7- The wheelbarrow moves by the effect of _______
    a- water pushing force     c- air pushing force        
    b- hand pushing force      d- motor pushing force
8- Electric fan rotates by the effect of __________.
       a- water pushing force     c- air pushing force        
       b- hand pushing force      d- motor pushing force
9- In machines, pulleys_______________
      a- make the motion easier
      b- prevent motion
      c- transfer the motion
      d- (a) , (b) and (c)
10- To transfer motion in machines, you need _______
     a- pulleys      b- gears     c- crane    d- elevator

Put (  √ ) or ( X  ) and correct the wrong ones:
1- Hand pushing force changes the state of a toy car from motion to rest.                                                       (         )
2- The motion of any object and its stopping need force.                                            (        )
3- Pulling rope game is one of the applications that depend on force.                                                                     (        )
4- The motion decreases by increasing the force.  (        )
5- Gears make the motion easier.                           (        )
Write the scientific term of the following:
1- The effect that changes the state of the object.                                             _____________
2- The measuring unit of force.          ____________
3- A technological application that depends on the effect of force in rising heavy objects. ___________
4- Parts existing in the machines to make the motion  easier.                                          _____________
5-  Parts existing in the machines to transfer the motion.                                         ____________

Give reasons for each of the following:

1- Force is an effect that changes the state of an object.
_________________________________________
_________________________________________

2- Gears are important in machines.
_________________________________________
_________________________________________

3- Pulleys are important in machines.
_________________________________________
_________________________________________

Lesson Two
Forms of energy and their changes
Worksheet7

Complete:
1- Energy is the ability to do ____________.
2- The spring of the children's toy stores ___________ energy.
3- _______ is the energy produced by a heater, while   _______ is the energy produced by a radio.
4- _______ is the energy produced by a dry cell, while _______ energy is stored in a dry cell.
5- _______ is a form of energy that reaches ear causing hearing.
6- Sound originates from ___________.
7- In the guitar, _______ energy changes into _______ energy.
8- When you rub your hands together, _______ energy changes into _________ energy.
9- We get ________ energy from the solar cells.
10- In a solar heater, ______ energy changes into _____ energy.

Choose the correct answer:
1- The energy produced by a piano is the __________
   a- potential energy           b- sound energy    
   c- electric energy             d- chemical energy
2- The electric energy is produced by __________
   a- the dry cells                 b- the piano
   b- the electric lamp          c- the fan
3- The energy coming from the lamp or the sun is _______
    a- potential energy           b- sound energy    
    c- light energy                 d- kinetic energy
4- The kinetic energy changes into sound energy in _______
a- violin      b- a lamp    c- knocking on the door     d- (a) and (c)  
5- Dynamo changes the _________
a- electric energy into potential energy
b- light energy into electric energy
c- kinetic energy into light energy
d- kinetic energy into electric energy

Put ( √ ) or ( x  ) and correct the wrong ones:

1- The energy stored in the spring of a toy is kinetic energy.        (     )
2- The energy produced from the solar heater is electric energy.                                                               (     )
3- Light is a form of energy that reaches ear causing hearing.     (     )
4- Sound stops when the vibration of a tunning fork stops.         (      )
5- Focusing the sun rays by a convergent lens on a piece of paper causes the changing of the light energy into electric energy.                                                                  (     )







Give reasons for each of the following:

1- You hear a sound when you tap a tunning fork.
__________________________________________________________________________________


2- When you ride a bicycle, some changes of energy happen.
__________________________________________________________________________________

3- When you remove a nail from wooden plate, the nail becomes warm. __________________________________________________________________________________

Lesson Three
Sources of Energy
Worksheet8

1 – Complete the following:
1 - ------------ is the main source of energy .
2 – Solar cell change ----------- energy into -----------energy.
3 – Coal, petroleum and natural gas are ----------
resources of energy.
4 – Wind and water falls are--------- resources of energy .
2 – How we obtain electricity from :
1 – Sun: ------------------------------------------------------------------------------------------------------------------.
2 – Moon:----------------------------------------------------------------------------------------------------------------.
3 – Water falls: --------------------------------------------------------------------------------------------------------
3 – Put (√ ) or (  x  ) :
1 – Plant grows in presence of sunlight.    (      )
2 – Sun and wind from renewable resources of energy.        (       )                    
3 – Car motor works by natural gas.            (       )
4 – Give reason:
1 – It is preferred to use natural gas instead of benzene.
---------------------------------------------------------------------------------------------------------------------------.
5 – Choose the correct answer :
1 – Solar heater changes solar energy into ……..... energy.     (heat – light – chemical )
2 – Which of the following groups are considered as renewable resources of energy?
A – Wind, water falls, sun.
B – Coal, petroleum and natural gas.
C – Wind, water falls and rising and ebb tide.


Lesson Four                         The Electricity
Worksheet9
1 – Choose the correct answer:
1 – Most of equipments at home work by ------------.
                         (heat -  light  -  electricity  )
2 - --------is formed when electric charges remain on an object.
        (Static electricity - light - current electricity)
3 – The source of electric current called ------------.
                        (switch -  wire  -  battery  )
4 - ------------- is used to close and open the electric circuit.                      (Wire - switch - battery)
2 – What happens when:
1 – Rubbing your hair by a comb.
----------------------------------------------------------------------
2 – On closing an electric circuit by a switch.
----------------------------------------------------------------------
3 – Give reasons:
1 – The electric circuit contains connecting wires.
-------------------------------------------------------------------------------------------------------------------------------------------

      Unit one
[ 1 ] – Complete the following statements :
1 – Esophagus allows food to pass from ---------to --------------
2 – Saliva changes ------------to --------------.
3 – Liver secretes ---------- juice which is stored in -----------.
4 – The body gets rid of carbon dioxide through -----------system
5 – The healthy breathing occurs through ---------- and not through the -------------.
6 - ----------is the common organ for respiratory system and digestive system.
7 – The animal cell is surrounded by ------------while the plant cell surrounded by -----------.
8 – Yeast fungus is made up of --------, --------and--------------
9 – The group of tissues which work together forms -----------
10 – The green leaves need -----------, ----------and -------------energy to perform photosynthesis process.
11 – When iodine solution is added to starch, its colour turns      --------------.
13 – Water + ………………                          sugar + -------.
14 – Food chain begins with -----------and ends with ---------
15 - ----------- Feed on the organic remains.
[ 2 ] – Put ( √ ) or (X) in front of the following statements :
1 – Absorption of food is completed in the small intestine.                                                                    (     )
2 – The pancreas secretes gastric juice.                (      )
3 – The number of teeth in an adult is 35.              (     )
4 – The large intestine is a part of urinary system. (    )
5 – The gas exchange process takes place in alveoli. (     )      
6 – The lungs and the heart are located in the chest cavity.                                                              (     )
7 – Lime water becomes turbid when the inhaled air passes through it.                                                                (     )
8 – Smoking does not affect man’s health.                (     )
9 – Both of plant cell and animal cell contains a nucleus.                                                             (     )
10 – The system is a group of tissues working together.                                                           (    )
11 – Green plants are called producers.                      (    )
12 – Oxygen gas is essential for photosynthesis process.                                                              (    )
13 – When a group of food webs connects with each other, they form a food chain.                                                     (   )
14 –Some fungi and bacteria are decomposers.                 (    )
15 – Herbivore consumer feeds directly on producers      (     )


[ 3 ] – Write the scientific term :
1 – Changing the complicated food substances into soluble substances.                                           ------------------
2 – A liquid secreted in the mouth and help in digestion of starch.                                                                                          -------------------                
3 – An organ stores the undigested food.    ---------------
4 – An organ secretes gastric juice.            ---------------
5 – An elastic membrane separates chest cavity from the abdominal cavity.                                            ---------------
6 – Process of getting the air out of the lungs. ------------  
7 – An organ that contains hairs to filter inhaled air from dust.                                                                ---------------       8 – Process of getting the air into the two lungs.
                                                                  -----------------  
9 - The gas which we can not live without it for few minutes.                                                                                                                 -----------------
10 – The building unit of living organisms.  ---------------
11 – A group of cells that work together.    ---------------
12 –Living organisms that can make their own food.  
                                                                --------------------
13 – It is the path of energy in a form of food from living organism to another one.                           ---------------    
14 – Organisms help the environment to get rid of the remains of organisms.                                                  -----------------
15 – Consumer that feeds on herbivore consumer.
                                                                ----------------  
[ 4 ] – Choose the correct answer :
1 – The --------- substances is digested in the stomach .
(sugar – protein – fat )
2 – Saliva helps in the digestion of ------------.
(protein – fat – starch )
3 – The adult has ----------- molars in each jaw.
(2    -   10 -   32   )
4 – Absorption of digested food takes place in the -------.
(stomach – small intestine – liver )
5 – Epiglottis is found -----------.
(above the pharynx – inside the nose – above the larynx )
6 – A living organism gets his energy from ------- process.   (digestion – excretion – respiration )
7 – The organ which warm the air before entering the lungs              (nose – larynx – trachea )
8 – The gas that makes lime water turbid ------------.
(oxygen – nitrogen – carbon dioxide )
9 –The cell wall is found in the -------------.
(animal cell – plant cell – cells of human body )
10 – The --------- is an example of unicellular living organism.                   (frog – bean plant – bacteria )
11 – A group of organs that work together forms --------
(a cell - a system – a living organism )
12 – The gas produced during photosynthesis process---------.   (water vapour – nitrogen – oxygen )
     
13 – Photosynthesis process takes place in -----------.
(root – green leaves – flower )
14 – Chloroplasts are found in ------------.
(producers – consumers – decomposers )


               Unit Two
[ 1 ] Complete the following :
1 – Changing of object state needs --------------.
2 – The measuring unit of force is ------------related to the scientist --------------.
3 – Force of ----------- moves the balloon upwards.
4 – Energy is the ability to do --------------.
5 – Sound is produced due to ----------- of objects .
6 – We get -----------energy from dry cell.
7 – In an electric motor , ---------- energy changes to ------------ energy .
8 – Light energy change to chemical energy as in ---------.
9 – In dynamo ---------- energy changes to electric energy.
10 - ---------- and -------------are from renewable resources of energy .
11 – The ---------- is the main source of energy on the earth's surface.
12 – Solar cell changes ----------energy to ------------ energy.
13 - ----------is used to close and open the electric circuit.

[2] Put ( √ ) or ( X ) in front of the following statements  
1 – Electric lift depends on the effect of force in rising of heavy objects.                                                                  (     )
2 – Electric fan rotates by the effect of water pushing.   (     )
3 – Turning on a lamp changes kinetic energy into potential energy.                                                                             (      )
4 – On beating a drum kinetic energy changes to light energy.
                                                                                        (     )
5 – Coal, wind and water falls are renewable resources of energy.                                                                            (       )
6 – Wind is used in rotating wind mills for generating electricity.                                                                       (      )
7 – Petroleum is preferred than natural gas.                   (       )
8 – Sun is not necessary for growth of plants.                 (       )
9 – Rubbing of objects generates light.                           (        )
10 – Static electricity is formed from electric charges that remain on an object.                                                         (       )
[ 3 ] Write the scientific term :
1 – It is an effect that changes the state of an object.
                                                           ------------------  
2 – The ability to do work.                       -----------------
3 – The energy produced from the dry cell.    -------------
4 – The energy produced from the piano       --------------
5 – The energy stored on a spring of a car toy.  --------------
6 – The energy of running water to rotate turbines.
                                                                    --------------
7 – The energy produced due to vibration of objects.
                                                                   ---------------  
8 – Sources of energy that renew themselves.
                                                                -----------------  
9 – The cleanest forms of fuel.                ----------------                  
10 – It is used to change solar energy to heat energy.
                                                             ------------------
11 – It is rotated by wind to generate electricity.
                                                            -----------------
12 – It is the path of electric current.  ------------------
13 – It is the source of electric current in the electric circuit.                                                            ------------------