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

  • question_answer
    How does photosynthesis help to maintain the percentage of oxygen and carbon dioxide in the atmosphere?

    A)  By giving off carbon dioxide and absorbing oxygen.

    B)  By giving off oxygen and absorbing carbon dioxide.

    C)  By releasing oxygen and carbon dioxide.

    D)  By absorbing oxygen and carbon dioxide.

    Correct Answer: B

    Solution :

    During photosynthesis, carbon dioxide is used to prepare sugars and oxygen is released into the atmosphere. This helps to maintain the percentage of oxygen at around 21% and that of carbon dioxide at around 0.03% in the atmosphere.

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