Why is it necessary to observe aseptic protocol during mineral nutrient experiment?

Question

Why is it necessary to observe aseptic protocol during mineral nutrient experiment?

Answer 1

If microbes would grow in your container, they could use up some of the nutrients and this would change the amount that was available to the other organisms you could be trying to grow.  And the microbes could have unexpected effects of producing chemical products (like penecillium making an antibiotic) or waste products which could even kill the organisms you're trying to culture.  So you would want to use aseptic (sterile) culture methods so you don't get anything in the containers that you don't want - that would just add another variable that you wouldn't be able to account for in your experiment's results.