I am planning a Biology investigation for my IB IA on the impact of temperature and pH on algae growth. Does anyone have tips on how to measure the growth rate of algae? What algae is the most suited for such an experiment? Also, how do I change the pH of the water containing algae? I'm a beginner, any ideas would be a great help!

  • $\begingroup$ Welcome to the site - can you tell us what sort of equipment you have access to? In particular do you have access to pH meter, microscope, hemocytometer, low mass scales, drying oven, $\endgroup$
    – bob1
    Aug 18, 2021 at 9:53
  • $\begingroup$ Perhaps spirogyra? Make sure any tap water is left overnight to gas off the chlorine compounds. $\endgroup$ Aug 19, 2021 at 9:51
  • $\begingroup$ i have access to a wide range of equipment, all those you listed I can use $\endgroup$
    – Antonia
    Aug 23, 2021 at 11:08

1 Answer 1


In general is a good idea to check the scientific literature in the subject. In the section "materials and methods" you could find how people do stuff like measuring growth or controlling pH.

Of course, many of the methods described there could be out of reach, but you can get ideas and ask here more specific questions.

For this specific question a quick search lead me to this paper "Standard Methods for Measuring Growth of Algae and Their Composition"


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