In a water culture experiment, the culture solution in a transparent beaker turned green. What precaution
should have been taken to prevent the culture solution from turning green?
should have been taken to prevent the culture solution from turning green?
-
A.
Changing the culture solution regularly -
B.
Increasing the number of times the culture is aerated -
C.
Covering the transparent beaker with black cloth -
D.
Adding warm alcohol to bleach the green colour -
E.
Sterilizing the beaker in a hot oven before use