What result would you expect to get if you tested a leaf that had been kept in the dark 12 hours?

If a leaf has been kept in the dark for 12 hours, you would expect to find reduced levels of photosynthesis-related products, such as glucose and oxygen. The leaf may show signs of starch depletion, as it relies on light for photosynthesis to produce starch. Additionally, if tested for chlorophyll, the leaf's green pigmentation should remain intact, but overall energy storage and photosynthetic activity would be significantly diminished compared to a leaf kept in light.