
English 9_2nd Grading Exam
Quiz by Decemie Aballe
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Passage 1.
John saw many tadpoles in a pond in his school eco-garden. He wanted to find out which type of water, pond water or tap water, is more suitable for the tadpoles to grow healthily. He caught the tadpoles and placed them in 2 identical containers as shown below. He placed the containers in the same room.Â
However, his teacher told him that his experiment was not a fair test.
Question No. 1.Â
Which of the following variables might have caused the test to be unfair?
Why might using different types of water (pond water and tap water) make this test unfair?