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 CH 5 MODEL ANSWERS G7

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Mr_Abdulrahman

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Posts : 42
Join date : 2010-01-28

PostSubject: CH 5 MODEL ANSWERS G7   Tue Feb 09, 2010 7:10 am

1st : Life Science

1. 1- STATE IF THE FOLLOWING SENTENCES ARE TRUE OR FALSE , THEN CORRECT THE WRONG SENTENCES 1 marks



1. Worms are classified into 4 main groups. ( F )

………………………………………3…………………………………………………………………

2. Sharks have good eye sight. ( F )

…………………….poor…………………………………………………………………………….



2-COMPLETE THE FOLLOWING SENTENCES2 marks



1. Fishes and amphibians are exothermic whose body doesn’t produce much internal heat, also we can call them cold blooded animals.

2. The skull protects the brain



3-GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING1 marks



1. Cnidarians have nerve cells.

Help them respond quickly to danger and to nearby food





4-WHAT WOULD HAPPEN IF1 marks



1. The endoskeleton is mal functioned.

The organisms like echinoderms will not have a bumpy texture





5- LABEL THE FOLLOWING DRAWINGS1 marks

a) What kind of organisms is this vertebrate?

birds



b) What are structures 1 and 2?

1. Contour feathers

2. down feathers

c) What is the function of structure 1?

Give shape to a bird's body and help it fly



6- GIVE THE SCIENTIFIC TERM 1 marks



1. Kind of sponge cells that can digest food, remove wastes, & form both sperms and eggs. (jelly-like cells in sponges.)

2. A large muscle is located at the bottom of the ribs. ( Diaphragm )



7-COMPARE BETWEEN THE FOLLOWING (two items are needed for each): 1 marks


Herbivores

Carnivores

1) Animals that eat only plants



2) Such as gastropods










1) Animals that eat only other animals



2) Such as cephalopods












8- ANSWER THE FOLLOWING QUESTIONS1 marks

1. What is meant by adaptation ?

Structures and behaviors that allow organisms to survive in their environment



2. What material makes up the skeleton of a jawless fish?

Cartilage





9- CHOOSE THE CORRECT ANSWER 1 marks

1. Gastropods have………………

a) two external shells b) exoskeleton c)one external shell or no shells.



2. All mollusks are characterized by:

a)segmented body b) presence of shells. C)soft bodies. D) compound eyes









2nd : Chemistry

1. STATE IF THE FOLLOWING SENTENCES ARE TRUE OR FALSE , THEN CORRECT THE WRONG SENTENCES1 marks



1. Glass is a crystalline solid .( F )

Table salt………………………………………………………………….………………………

3. Alkaline earth metals are the most reactive metals in the periodictable( F )

Alkali………………………………………………………….…………………………..………………



2. COMPLETE THE FOLLOWING SENTENCES 2 marks



1. liquids and gases take the shape of the container.

2. oxygen gas and water are two examples of fluids.



3. GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING

1 marks

Density is a one way to identify a substance.

Because there is no two different substances have the same density (different substances have different densities)





4. WHAT WOULD HAPPEN IF1 marks

You discover a new element that is shiny, malleable and ductile.

I group it as a metal, give it a name and symbol and put it in a group and period in the periodic table according to its atomic and mass numbers.







5. GIVE THE SCIENTIFIC TERM 2 marks



1. The point at which all the solid turns into liquid without

Change in temperature. ( melting point )

2. A change in which energy is released. ( exothermic )







6. COMPARE BETWEEN THE FOLLOWING (TWO ITEMS ARE NEEDED FOR EACH) 1 marks


Alkali Metals
Alkaline Earth Metals



  • Group 1 in the periodic table




  • More reactive metals







  • Group 2 in the periodic table




  • Less reactive metals

















7. ANSWER THE FOLLOWING QUESTIONS1 marks

1. State a physical change and a chemical change that may happen to a piece of sugar.

Dissolving sugar in water is a physical change but burning sugar is a chemical change



2. Helium does not react with any other substances .is it accurate to say that helium has no chemical properties? Explain

No. this is a chemical property of helium that it does not react with other substances





8.CHOOSE THE CORRECT ANSWER1 marks



1. The volume of a cube of wood one of its dimensions is 2 cm equals……..

a)0.06 m b)0.006m c) 0.008 m d) 0.08 m



2. Which one of the following describes the nucleus?

a) Neutral b) dense c) negative d) takes space








Best wishes,
And good luck
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Beauty Girl

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Posts : 95
Join date : 2010-01-27
Age : 21
Location : UR DREAMS

PostSubject: Re: CH 5 MODEL ANSWERS G7   Tue Feb 09, 2010 5:44 pm

santa santa Thanx soooooooooo Much Mr.ABDULRAHMAN santa santa











HOGO
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