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Photosynthesis

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  1. Suppose an aquatic plant is placed in a test tube containing distilled water and the tube is stoppered. The tube is left outdoors for 24 hours and the pH value of the water is then measured at regular intervals. Which of the following is the most probable result?
    1. The pH value is lowest just before sunrise
    2. The pH value is highest just before sunrise
    3. The pH value is lowest at noon
    4. The pH value is lowest just before sunset.
Correct Option: A

After sunrise, photosynthesis is carried out using CO2. Hence concentration of CO2 decreases increasing pH.


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