WAEC - Biology (2021 - No. 23)
The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question.
What precaution should have been taken to prevent the solution from turning green?
use a non-green plant for the experiment
aerate the solution daily
cover the culture vessel with opaque paper
keep cotton wool around the seedling to make it dry