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10th Class Science Life Processes Question Bank Life Processes

  • question_answer
    The given figure is a demonstration of an experiment to show that carbon dioxide is essential for photosynthesis. What is the substance 'X', kept in watch-glass?

    A) Potassium hydroxide

    B) Sodium bicarbonate

    C) Sodium carbonate

    D) Potassium sulphate

    Correct Answer: A

    Solution :

    In the given experiment, plant is destarched first and then kept in the bell jar along with potassium hydroxide in a watch-glass. When this setup is kept in sunlight for few hours and is then tested for starch, it will show negative result. This shows that plant fails to get \[C{{O}_{2}}\]to perform photosynthesis because\[C{{O}_{2}}\]gets absorbed by potassium hydroxide.


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