Photosynthesis and Respiration
If the oxygen is labeled in CO2 and provide this CO2 to a plant, where it is expected to find this labeled oxygen after the plant had undergone photosynthesis?

In the NADPH
In the water used
In the oxygen given off by the plant
In the carbohydrate produced

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Photosynthesis and Respiration
Which of the following statements about energy metabolism is false?

Plants provide the water and CO2 that animals need to carry out respiration
All eukaryotic organisms carry out respiration in the presence of O2
All animals in some way rely on plants for their energy
The energy that powers living systems ultimately comes from the sun

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