An aquatic plant was placed in a test tube containing water. The tube was stoppered and left outdoors for 24 hours. The pH vale of water is measured at regular interval. The observation would be​:
A. pH value was the lowest just before sunrise.
​B. pH value was the highest just before sunrise.
​C. pH value was the lowest just at noon.
​​D. pH value was the lowest just before sunset

Dear student,
Answer is A. pH value was lowest just before sunrise.
As the sun rises aquatic plant starts photosynthesis in the presence of carbon dioxide which decreases increasing pH value.

Regards

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