Thank You Chris09... reminds me of when my dad told me as a kid to only transplant once there were 'true leaves'.Oats like most grass is a plant as soon as it has roots and leaves.
Now plants that sprout with cotyledons are not a plant until they have there true leaves and are no longer relying on the cotyledons to make photosynthesis. Also photosynthesis starts as soon as leaves receives sunlight.