THE MODEL ANSWERS FOR MODEL EXAM 1

Diplomatic International School








1st Life Science :
1. State If the following sentences are true or false , then correct the wrong sentences :
1. ( T )
2. ( F )
Squids and octopuses

2. complete the following sentences:

1. invertebrates - without
2. invertebrates - internal

3. Give the scientific reasons for the following:
Because only birds have feathers

4. What would happen if:
It can not fly for a long time as its flight needs much food and oxygen for energy

5. Label the following drawings :


segmented worms

6. Give the scientific term :

1. (Diaphragm)
2. (Exothermic)

7. Compare between the following (two items are needed for each) :

1.
Round worms
1.Their bodies are cylindered
2.Such as : hookworms

Segmented worms
1.Their bodies are segmented
2.Such as : Earthworms

8. Answer the following questions :

1. During the larval phase

2. Male medusa releases sperm that fertilize eggs of the female medusa. The fertilized egg develops into a larva which then develops into a polyp


9. Choose the correct answer:

1.
a)Larva

2.
b) bilateral symmetry


2 nd chemistry :
1. State If the following sentences are true or false , then correct the wrong sentences :
1. ( F )
………is considered……………………………………….………………………………..……
2. ( T )
………………………………………………………….…………………………..…………………

2. complete the following sentences:

1. using a magnet ,filtration and distillation
2. brass

3. Give the scientific reasons for the following:

1.
Because sodium chloride particles are small enough to pass through the filter paper spaces but sand particles are larger

4. What would happen if:
Because its density is lower than the density of the air so it rises up


5. Label the following drawings :

The arrangements of solid, liquid, and gas particles
1. the solid particles are stick to each other
2. the liquid particles are far apart
3. the gas particles are further apart


6. Give the scientific term :

(semiconductors)
(periods.)

7. Compare between the following (two items are needed for each) :

Physical properties

a. The properties that describe the shape ,size ,color, texture and state of a substance

b. Such as: the melting point of ice is 100 c

Chemical properties
a. The properties that describe the ability of a substance to react with other substances and what it may form(like a precipitate).

b. Such as: forming rust

8. Answer the following questions :

1. Physical and chemical properties

2. Atomic numbers, atomic masses, melting points, densities, chemical behavior …etc


9. Choose the correct answer:

1. b) 6

2. a)C -14,C-12

Dear Student
Imagine this with me ..
if you added water to , Sodium Chloride , which is ( table salt ) , Sodium
Chloride will dissolve in water .

And to filter means :adding water to the mixture then add the mixture to a filter paper so materials that do not dissolve in water will remain in the
filter paper .
So sodium chloride will not remain in the filter paper , because it is
already dissolved in water ,

So we can not use filtration to separate sodium chloride in water.