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7th Class Science Nutrition in Plants Question Bank Nutrition in Plants and Animals

  • question_answer
    In an experiment demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable?                         

    A) Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate.

    B) Amount of oxygen evolved decreases as the availability of carbon dioxide increases.                        

    C) Amount of oxygen evolved increases as the availability of carbon dioxide increases.                        

    D) Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate.

    Correct Answer: C

    Solution :

    Water containing sodium bicarbonate \[(NaHC{{O}_{3}})\] releases more\[C{{O}_{2}}\]. Hence, availability of more\[C{{O}_{2}}\], results in the increase in rate of photosynthesis which in return results in increase in amount of oxygen evolved.


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