Compare Photosynthesis and Cellular Respiration - Practice 1

Photosynthesis stores energy in organic molecules using light in the cases here.

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Photosynthesis stores energy in organic molecules using light in the cases here. Aerobic cellular respiration transfers energy from organic molecules into usable forms such as ATP, using oxygen. Plants perform respiration too; they do not only photosynthesize.

Worked example

A green plant can make sugars by photosynthesis and use some of those sugars in cellular respiration.

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An oxygen molecule, O2, contains two atoms but only one kind of element. Counting atoms and counting elements answer different questions.

Question 1 Which process uses light to make sugars from carbon dioxide and water in a green leaf? photosynthesis aerobic respiration neither process

Question 2 Which process uses oxygen while releasing energy from sugars in this model? photosynthesis neither process aerobic respiration

Question 3 Which statement about a living green plant is correct? It never needs energy. It can perform photosynthesis and respiration. It never respires.

Question 4 In which process is oxygen produced in the simplified green-plant model? photosynthesis aerobic respiration neither process

Question 5 Which process releases carbon dioxide in the simplified sugar-and-oxygen model? photosynthesis neither process aerobic respiration

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