Multiple choice

Respiration is defined as

  1. reduction of CO2 to produce energy

  2. oxidation of organic compounds to produce energy

  3. reduction of carbohydrate to produce CO2

  4. oxidation of CO2 to carbohydrate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Respiration is a catabolic process where organic compounds (like glucose) are oxidized (broken down) with oxygen to release energy (ATP), carbon dioxide, and water. Option B correctly states this. Option A is incorrect because respiration produces CO2, not reduces it. Option C is incomplete and reverses the process. Option D describes photosynthesis (the reverse of respiration).

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