Azalea set up two aquariums, X and Y, with equal amounts of water and five fishes each. He fed and cared for the fishes the same way except he added an air pump to Tank X. The next day, the fishes in Tank Y were swimming near the surface while those in Tank X were not. When Azalea changed the water and removed three fishes from Tank Y, the remaining two stopped swimming at the surface. This experiment showed that living things need oxygen to survive and Azalea kept the variables of food, water amount, and number of fishes the same to make it a fair test.

1. AiU-Irsyad International School
Primary 3 SCIENCE
Topical Test 2 -2017
Name: _________________________ Class: _________
Date: __________________________ Marks: _____ / 20
Parent’s Signature: _______________ Duration: 30 minutes
_____________________________________________________________
1. Answer all the questions. [6 marks]
Azalea set up two aquariums, X and Y. First, he filled two similar tanks with
equal amounts of water. He then placed five fishes in each tank. He fed the
fishes in both tanks with the same amount of food. He also placed an air
pump in Tank X.
The next day, he observed that the fishes in Tank Y were swimming near the
surface of the water.
a. Why were the fishes in Tank Y were swimming near the surface of the
water? [1 marks]
_____________________________________________________________
b. Azalea changed the water in both tanks and removed three of the fishes
from Tank Y. The remaining two fishes stopped swimming near the surface
of the water. Why were they able to do so? [1 marks]
——————————————————————————————————

2. c. What does this tell you about a characteristic of living things? [1 marks]
——————————————————————————————————
d. Name three variables that Azalea kept the same to make his experiment a
fair one. [3 marks]
i) _____________________________________________________
ii) _____________________________________________________
iii) _____________________________________________________
_____________________________________________________________
2. William grouped different types of animals as shown below.[2 marks]
a. Write down the names of the different groups of animals above in the
boxes provided.
Group W Group X Group Y Group Z

3. 3. Fill in the blanks. [6 marks]
a. ________________ have feathers. _______________ have hair and fur.
________________ and ________________ scales. ______________
have moist skins. _________________ have a hard outer body covering.
b. Female _______________ produce milk to feed their young.
c. Only _______________ have beaks.
d. Fish have ____________ on both sides their head.
e. Birds have two ____________. However, not all birds can fly.
f. Fish can be found both in _______________ and _______________.
Birds Mammals Fish reptiles Amphibians Insects
mammals birds wings gills seawater freshwater

4. _____________________________________________________________
4. Circle those that are insects. [3 marks]
a.
b. Only insects have a ___________ part body structure and ____________
legs. Insects lays _____________. [3 marks]
***** END OF PAPER *****
_____________________________________________________________
Scorpion Mosquito Bee
Cockroach Spider