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Question

15 The gas that helps to break down food in our body and thus release energy is


A

oxygen

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B

carbon dioxide

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C

hydrogen

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D

nitrogen

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Solution

The correct option is A

oxygen


The explanation for the correct option:

(A)-Oxygen

  • Cellular respiration is the process of burning food inside the body with the help of oxygen.
  • It is a mechanism for generating energy from food.

The explanation for the incorrect option:

(B) Carbon dioxide

  • Photosynthesis is the process in which plants make their own food, and oxygen is produced along with it. Plants also consume oxygen for respiration, but they produce more than they consume.

begin mathsize 14px style stack 6 C O subscript 2 open parentheses g close parentheses with Carbon space Dioxide below plus space stack 6 H subscript 2 O with Water below open parentheses l close parentheses yields with Chlorophyll below and sunlight on top stack C subscript 6 H subscript 12 O subscript 6 with Glucose below open parentheses aq close parentheses plus stack 6 O subscript 2 with Oxygen below open parentheses g close parentheses
end style

(C)-Hydrogen

The lightest element is hydrogen. Under normal circumstances, hydrogen is a diatomic gas with the formula(H2). It's colourless, odourless, tasteless, non-toxic, and extremely flammable.

(D)-Nitrogen

  • Air is composed of 78% of Nitrogen.
  • Nitrogen is also a major component of amino acids, the building blocks of proteins.

Final answer: A correct answer is an option (A).


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