Multiple choice The process of breakdown of carbohydrates to produce CO2, water and energy is called photosynthesis osmosis nutrition respiration Reveal answer Fill a bubble to check yourself D Correct answer Explanation Cellular respiration is the metabolic process that breaks down carbohydrates (glucose) to produce CO2, water, and ATP energy. Photosynthesis is the reverse process. Osmosis is water movement, and nutrition is about obtaining and using food.