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2 years ago

Caroline set up a fourth test tube that contained a leaf and was exposed to dim

Biology

1 answer:

meriva2 years ago

5 0

Answer:

Answer

+ 5.0

Answer: The NEGATIVE CONTROL is the

test tube that is filled with ONLY distilled

water.

Explanation:

A negative control of an experiment is

carried out alongside the main primary

experiment except that the treatment is

changed to something that is predicted

to have no result. In the negative

control, the student does not expect any

response. This would help the student

compare the result of a new experiment

against an already known existing results.

Analysing the experiment carried out

by the student, She filled two test tubes

with distilled water and placed a piece

of Elodea in one of the tubes, leaving

the other without a plant. The other test

tube that contains only distilled water is

the negative control because she wasn't

expecting any result from it. It's also

served as a control sample to the primary

experiment. This is observed as she

blew in each tube to add carbon dioxide,

which caused the distilled water to

become more acidic. This would help the

student know that the that experimental

results are valid and to ensure that time is

saved

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