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 CH4 MODEL ANSWERS G 7

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Mr_Abdulrahman

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Posts : 42
Join date : 2010-01-28

PostSubject: CH4 MODEL ANSWERS G 7   Mon Feb 08, 2010 3:47 am



1st : Life Science

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



1. Cartilaginous fishes are carnivores. ( T )

…………………………………………………………………………………………………………

2. Worms have no nervous system. ( F )

…………………have……………………………………………………………………………….



2-COMPLETE THE FOLLOWING SENTENCES2 marks





1. Birds have internal fertilization and lay eggs

2. Mammals obtain oxygen through their lungs







3-GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING1 marks

Earth worms body is moist.

To obtain oxygen through their skin



4-WHAT WOULD HAPPEN IF1 marks



Mammals are cold blooded organisms .

Their bodies temperature will change if the temperature of the surrounding changes





5- GIVE THE SCIENTIFIC TERM 1 marks



  • The phase-shaped body plan in cnidarians . ( polyp )
  • A kind of mammals that develop inside its mother's body until its body systems can function independently. (placental mammals )






6-COMPARE BETWEEN THE FOLLOWING (two items are needed for each): 2 marks



polyp
Medusa

1. The vase-shaped body plan in cnidarians



2. its mouth opens at the top














1. The bowl-shaped body plan in cnidarians



2. its mouth opens downwards








7- ANSWER THE FOLLOWING QUESTIONS1 marks





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

Cartilage



2. What is the function of pores in the structure of sponges?

The pores pass water carrying oxygen over the cells inside the sponge

8- CHOOSE THE CORRECT ANSWER 1 marks





1. Unlike sponges ,worms have……………….

a)jelly like cells b) bilateral symmetry c)spikes to defend itself d)pores



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



3. Milk is a substance but table salt is not.( F )

Table salt is a pure substance but milk is not……..…………………………..

4. By cooling a gas it turns into a liquid. ( T )

………………………………………………………….…………………………..…………………



2. COMPLETE THE FOLLOWING SENTENCES2 marks

3. Some insects can float on the surface of water because of surface tension

4. The periodic table consists of 18 groups and 7 periods



3. GIVE THE SCIENTIFIC REASONS FOR THE FOLLOWING

1 marks

1. The atom is neutral.

Because the number of positive protons inside the nucleus equals the number of negative electrons around the nucleus



4. WHAT WOULD HAPPEN IF 1 marks

1. You discovered a new element that is not reactive.

I will Put it in group 18 in the periodic table, noble gases group and give it a name and a symbol



5. LABEL THE FOLLOWING DRAWINGS 1 marks



a) Number 1 and 2 are metals

b) Number 3 is a metalloid(semi-metal) element

c) Number 4 is called halogens family

d) Number 5 is called noble gases family







6. GIVE THE SCIENTIFIC TERM1 marks



  • A system of units for the properties of substances . ( SI units )
  • The total energy of all of the particles in an object


and other sheets. (thermal energy )





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






particles
position
charge
protons

nucleus

positive
neutrons
nucleus

neutral
electrons

Around the nucleus
Negative





8. ANSWER THE FOLLOWING QUESTIONS 1 marks

1. Propose a way to determine the density of air.

Measure the mass of air in a balloon (mass=mass of balloon and air – mass of empty balloon) then measure the volume of air in the balloon by using the displacement method (volume = the reading of water and the balloon in a cylinder – the reading of water only) then divide the mass by the volume to get the density of air



2. Honey has low viscosity.

Because of its particles shape, size and attraction forces between them that increase the resistance of honey to flow fast



9. CHOOSE THE CORRECT ANSWER 1 marks



1. Calcium reacts by sharing or losing ………electrons

a)1 b) 2 c)3 d) 4



2. Which of the following materials floats on the surface of water?

a)oil b) iron c) copper d) corn syrup



Best wishes,
And good luck



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khaleel96

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Join date : 2010-02-07
Age : 22

PostSubject: Re: CH4 MODEL ANSWERS G 7   Mon Feb 08, 2010 5:49 pm

thank you mrs.abdulrahman for the answers
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lost angel

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Join date : 2010-01-31
Age : 21
Location : Riyadh

PostSubject: Re: CH4 MODEL ANSWERS G 7   Mon Feb 08, 2010 6:39 pm

santa santa THANX SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO MUCH Mrs.Abdelrahman santa santa



SAMA
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Beauty Girl

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Posts : 95
Join date : 2010-01-27
Age : 20
Location : UR DREAMS

PostSubject: Re: CH4 MODEL ANSWERS G 7   Mon Feb 08, 2010 8:04 pm

cheers cheers Than x alot Mr.ABDULRAHMAN we apreciate ur hard work with us cheers cheers






HOGO
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Mr_Abdulrahman

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Join date : 2010-01-28

PostSubject: WELCOME ANY TIME   Mon Feb 08, 2010 9:25 pm

Dear khaleel, Sama and Hager:
I appreciate your continuous communication with me, and I hope that you understand all the answers ...I remind you again that I will be here all the time, as possible I can, for help. THANKS ALOT
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