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xxMikexx [17]
4 years ago
12

Identify the positive and negative controls used in this experiment. explain how each of these controls are used, and why they a

re necessary to validate the experimental results
Biology
1 answer:
Gekata [30.6K]4 years ago
3 0
A positive control is when you test your experiment against something where you know what the effects will be, whereas a negative control would be when you test the experiment with something you know will have no effect.
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B

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A. would be the correct answer

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3 years ago
The pH indicator bromothymol blue is an alkaline solution and yellow is an acidic solution. A slight increase in acidity. Such a
spayn [35]

Water plants in the solution are placed under a bright lamp. Thus, option "B" is correct.

<h3>Explain your answer briefly?</h3>

As we know adding carbon dioxide in as solution result in the change of its acidity this is result in the indicator to change from blue to yellow. In the question, it is asked that what factors from the given option will cause yellow indictor to blue which means what factors cause the solution to be alkaline from acidic.

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Thus, this could be the answer.

The question is incomplete, however, the missing part is given as below:

A. Yeast cells and sugar are placed in the solution. B. Water plants in the solution are placed under a bright lamp. C. Algae are placed in the solution and left in a dark room. D. A person blows air into the solution through a straw.

To learn more about  pH indicator click here:

brainly.com/question/16236741

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